Category Archives: History of Astronomy

Calendrical confusion or just when did Newton die?

Today there is general agreement throughout the world that for commercial and international political purposes everybody uses the Gregorian calendar, first introduced into the Catholic countries of Europe in 1582. However Europeans should never forget that for other purposes other cultures have their own calendars often wildly at odds with the Gregorian one. Tomorrow is for example the Persian New Year’s a festival, which marks the first day of spring. The Persian calendar is not only used in Iran but in many other countries that were historically under Persian influence. Tomorrow also marks the first day of the year 1394 for Persians. Earlier all cultures used their own calendars a bewildering array of lunar calendars, lunar-solar calendars and pure solar calendars making life very difficult for both astronomers and historians. Trying to find out what a given date in an original document is, or better would have been, on our ‘universal’ Gregorian calendar is often a complex and tortuous problem. Astronomers whose observations of the heavens need to span long periods of time solved the problem for themselves by introducing a standard calendrical scale into which they then converted all historical astronomical data from diverse cultures. Throughout late antiquity, the Islamic Empire and well into the European Early Modern Period astronomers used the Egyptian solar calendar for this purpose. You can still find astronomical dates given according to this system in Copernicus’ De revolutionibus. In modern times they introduced the Julian day count for this purpose.

Within Europe the most famous calendrical confusion occurred in the early centuries following the introduction in Catholic countries of the Gregorian calendar. Exactly because it was Catholic most Protestant states refused, at first, to introduce it, meaning that Europe was running on two different time scales making life difficult for anybody having to do outside of their own national borders, in particular for traders. This problem was particularly acute in The Holy Roman Empire of German States that patchwork of small, medium and large states, principalities and independent cities that occupied most of middle Europe. Neighbouring states were often of conflicting religious affiliation meaning that people living in the border regions only needed to go a couple of kilometres down the road to go ten days backwards or forwards in time. The only people who were happy with this system were the calendar makers who could sell two sets of calendars Gregorian, so-called new style or ‘ns’ and Julian, so-called old-style or ‘os’. Some enterprising printer publishers even printed both calendars in one pamphlet, for a higher price of course.

Within Germany the problem was finally solved at the end of the seventeenth century, largely due to the efforts of Erhard Weigel who campaigned tirelessly to get the Protestant states to adopt the Gregorian calendar, which they finally did on 1 January 1700. England as usual had to go its own way.

Although John Dee, the court advisor on all things mathematical, recommended the adoption of the Gregorian calendar in the sixteenth century the Anglican Bishops blocked its adoption because it came from the Pope and the Anglican Church couldn’t be seen cowing down to the Vatican. Even when the Protestant German states finally accepted that adopting the Gregorian calendar was more rational than any religious prejudices the English still remained obdurate, not prepared to have anything to do with Catholicism. England final came into line in 1752. So what about Isaac Newton?

Many Internet sources are saying that Isaac Newton died on 20 March almost none of them say whether this is new-style or old-style. Most of the sources give 1727 as the year of death a few 1726. Most sources give Newton’s life span as 1642–1727, others 1642–1726 and yet others 1643–1727, what is going on here?

Isaac Newton was born 25 December 1642 according to the Julian calendar that is old-style. If converted to the Georgian calendar, we have to add ten days, and so his date of birth was 4 January 1643 new-style. Things become slightly more complicated with his date of death. Newton died 20 March 1726 according to the Julian calendar that is old-style. Converting to the Georgian calendar we now have to add eleven days because the Julian calendar has slipped another day behind the Gregorian one so his date of death is 31 March 1727 new-style. Wait a minute we just jumped a year what happened here? When Julius Caesar introduced the solar calendar in Rome he moved the New Year from the traditional Roman spring equinox, 25 March, to the first of January. During the Middle Ages the Church moved the New Year back to 25 March. With the adoption of the Gregorian calendar New Year’s Day moved back to 1 January. However England still retaining the medieval version of the Julian calendar kept 25 March as New Year’s Day. Thus at the time of Newton’s death 1727 started on 25 March in England meaning that Newton died 20 March 1726 (os).

Just to summarise if you wish to correctly quote Newton’s dates of birth and death then they are 25 December 1642 – 20 March 1726 (os) or 4 January 1643 – 31 March 1727 (ns).



Filed under History of Astronomy, Newton

The continuing saga of io9’s history of science inanities.

I made a sort of deal with myself to, if possible, avoid io9 and above all the inane utterances of Esther Inglis-Arkell. Unfortunately I fell for a bit of history of science click bait on Twitter and stumbled into her attempt to retell the story of the degenerating relations between Isaac Newton and John Flamsteed, the Astronomer Royal. I say attempt but that is actual a misuse of the word because it somehow implies making an effort, something that Ms Inglis-Arkell is not willed to do. Her post resembles something half read, half understood and then half forgotten spewed out onto the page in a semblance of English sentences. It in no way approaches being something that one could honestly label history of science story telling even if one were to stretch this concept to its outer most limits.

I have blogged on the relations between Newton and Flamsteed on a number of occasion but let us look at Ms Inglis-Arkell miserable attempt at telling the story and in so doing bring the correct story out into the open. Our storyteller opens her tale thus:

Isaac Newton reached the level of genius in two different disciplines: physics and making people miserable. This is a tale of his accomplishments in the latter discipline. The object of his scorn, this time, is a poor astronomer named John Flamsteed, who made the mistake of not being agreeable enough.

I tend to dislike the term genius but if one is going to apply it to Newton’s various activities then one should acknowledge that as an academic he also reached the level of genius as a mathematician, as a theoretical astronomer and as an instrument maker and not just as a physicist. Credit where credit is due. On the subject of his making people miserable, John Flamsteed was anything but a saint and as I pointed out in an earlier post, Grumpy old astronomers behaving badly or don’t just blame Isaac!, in the dispute in question both of them gave as good as he got.

We now get to the factual part of the story where our storyteller displays her grasp of the facts or rather her lack of one:

Flamsteed and Newton started their acquaintance on good terms. They spent the 1680s happily corresponding about two lights in the sky, seen in 1680, which were either two comets or one comet that made two trips by Earth. This got Flamsteed interested in cataloguing [sic] the heavens. If enough information was compiled about the lay of the night sky, astronomers would be able to understand all kinds of things about the shape of the universe and how its various pieces worked. By the mid-1690s, Flamsteed was the Astronomer Royal and was making a star catalogue which he would publish when it was completed.

Remember that bit about half read and half forgotten? John Flamsteed had been installed by Charles II as Astronomer Royal for the newly commissioned Royal Observatory at Greenwich on 22 June 1675 “forthwith to apply himself with the most exact care and diligence to the rectifying the tables of the motions of the heavens, and the places of the fixed stars, so as to find out the so-much desired longitude of places, for the perfecting the art of navigation.” Not by the mid-1690s as Ms Inglis-Arkell would have us believe. I love the bit about how, astronomers would be able to understand all kinds of things about the shape of the universe and how its various pieces worked”, Which basically just says that she doesn’t have a clue what she’s talking about so she’ll just waffle for a bit and hope nobody notices. The Observatory itself wasn’t finished till 1685 but by the beginning of the 1680 Flamsteed was already busily fulfilling his obligations as official state astronomical observer.

The early 1680s saw a series of spectacular comets observable from Europe, and Flamsteed along with all the other European astronomers devoted himself to observing their trajectories and it was a conjecture based on his observations that led to his correspondence with Newton. He observed two comets in 1680, one in November and the second in mid December. Flamsteed became convinced that they were one and the same comet, which had orbited the sun. He communicated his thoughts by letter to Isaac Newton (1642–1727) in Cambridge, the two hadn’t fallen out with each other yet, and Newton initially rejected Flamsteed’s findings. However on consideration he came to the conclusion that Flamsteed was probably right and drawing also on the observations of Edmund Halley began to calculate possible orbits for the comet. He and Halley began to pay particular attention to observing comets, in particular the comet of 1682. By the time Newton published his Principia, his study of cometary orbits took up one third of the third volume, the volume that actually deals with the cosmos and the laws of motion and the law of gravity. By showing that not only the planets and their satellite systems obeyed the law of gravity but that also comets did so, Newton was able to demonstrate that his laws were truly universal. Note that Flamsteed two-in-one comet was orbiting the sun and not “one comet that made two trips by Earth”; this will come up again in the next paragraph:

Newton, meanwhile, believed that returning comets might be drawn to the Earth by some mysterious force. They might circle the Earth, in fact, the way the Moon circled the Earth. Perhaps, the force that drew the Moon and the comets might be the same. Newton wanted to study his “Moon’s Theory,” and to do so he needed the information in Flamsteed’s catalogue, incomplete though it was. Newton had risen to the rank President of the Royal Society of London for Improving Natural Knowledge; the titles might leave one in doubt as to who had the power, but Newton’s fame and connections far outstripped Flamsteed’s. When Isaac Newton wanted information from the catalogue, he wanted it immediately, whether it was published or not.

The opening sentences of this paragraph are a confession of complete incompetence for somebody, who, if I remember correctly, has a degree in physics. We are of course talking about the force of gravity, so why not call it that? Anyone who has studied physics at school knows that according to the law of gravity any two bodies “attract each other” something that Newton had spelled out very clearly in his Principia, which was published in 1687 before the dispute that Inglis-Arkell is attempting to describe took place. So the comets are not being “drawn to the Earth by some mysterious force”. In fact they are not being drawn to the Earth at all and there are certainly not circling it. Flamsteed’s careful observations and astute deduction had correctly led Newton to the conclusion that the force of gravity causes some comets to orbit the sun. As we shall see shortly when Newton and Flamsteed got in each others hair about Newton’s need for fresh observational date on the moon he was still Lucasian Professor of Mathematics in Cambridge and still ten years away from becoming President of the Royal Society. However before I go into detail let us look at Inglis-Arkell’s account of the affair.

You can get a lot done when you’re friends with the Queen, but it still took a lot of time for Isaac Newton to get what he wanted from John Flamsteed. First Flamsteed sent assistants’ work instead of his own. Newton was exasperated with the mistakes they had made. Newton wrote nasty letters. Flamsteed wrote nasty diary entries. Newton turned to the royal Prince George, asking him to order Flamsteed to write a book that would include all his current data. Flamsteed just couldn’t get it together to produce the book, much as he must have wished to comply with his Prince’s order.

Newton inspected the Royal Observatory. Flamsteed guarded the equipment so jealously that the two physically fought over it. Flamsteed ended that day with a very smug diary entry declaring that the “instruments… were my own.”

Now the Astronomer Royal was not only disobeying Isaac Newton but the actual Royals, and so it’s impressive that Flamsteed managed to keep his prestigious appointment. He didn’t lose his position or his data for over a decade. It wasn’t until 1712 that Newton was able to influence Queen Anne and Prince George enough to force Flamsteed to publish his data in a small volume. Still, Flamsteed was bitter at the defeat.

Our intrepid wanna-be historian of science has conflated and confused three separate struggles between the two protagonists into one, getting her facts wrong along the way and even making thinks up, not a very good advertisement for a website that wishes to inform its readers or maybe this is one of their sci-fi contributions.

Let us take a look at what really happened. In an incredible tour de force Newton wrote and published his Principia in the three years between 1684 and 1687 and as I noted above Flamsteed’s recognition that some comets orbit the sun went on to play a central role in this ground-breaking work. In his magnum opus Newton was able to demonstrate that the whole of the then known cosmos lay under the rule of the law of gravity. It determined the elliptical orbits of the planets around the sun as well as the orbits of the then known satellites of Jupiter and Saturn. It converted the comets from irregular prophets of doom into celestial objects with regular but extremely long orbits. Everything seemed to fit neatly into place in a clockwork cosmos. Well almost everything! The earth’s closest neighbour appeared not to want to obey the dictates of gravity. Although Newton managed to get a fairly good approximation of a gravity-determined orbit for the moon it wasn’t anywhere near as good as he would have liked.

The problem lies on the size of the moon. Having an unusually large mass for a satellite the moon is involved in a gravitational system with both the earth and the sun, the classical three-body problem. As a result its orbit is not a smooth ellipse but being pulled hither and thither by both the earth and the sun its orbit contains many substantial irregularities making it very difficult to calculate. There is in fact no general analytical solution to the three-body problem, as was finally proved in the nineteenth century by Henri Poincaré. The physicist or astronomer is forced to calculate each irregularity step by step, the situation that Newton found himself in whilst writing the Principia.

In 1693 Newton was contemplating a second edition of the Principia and decided to tackle the moon’s orbit anew. This required new observational data and the person who was in procession of that data was Flamsteed. Newton never the most diplomatic of men at the best of times was even more grumpy than usual in the early 1690s. He was recovering from what appears to have been some sort of major mental breakdown, he was tackling one of the few mathematical problem that would always defeat him (the moon’s orbit, which was finally solved by Laplace in his Exposition du système du monde at the end of the eighteenth century), and he was frustrated by his situation in Cambridge and was looking for a suitable position in recognition of his, in the meantime, considerable status in London. The latter would be solved by Charles Montagu appointing him Warden of the Mint in 1696. His approach to Flamsteed to obtain the data that he required was high handed to say the least. Flamsteed, also an irritable man, who was overworked, underpaid and underfinanced in his efforts to map the entire heavens, was less than pleased by Newton’s imperious demands but delivered the requested data none the less. Newton failed to solve his problem and blaming Flamsteed and his data demanded more. Flamsteed feeling put upon grumbled but delivered; and so the pair of grumpy old men continued, each developing an intense dislike of the other. In the end Newton’s demands became so impossible that Flamsteed started sending Newton raw observational data letting him calculate the lunar positions for himself. It is difficult to say where this vicious circle would have led if Newton had not lost interest in the problem and shelved it, and the plans for a second edition of Principia, in 1695. By now the two men were totally at loggerheads but would have nothing more to do with each other for the next nine years.

In 1704 Newton, by now Master of the Mint and resident in London, was elected President of the Royal Society. On 12 April 1704 Newton took a boat down the river from the Tower of London, home of the Mint, to Greenwich, home of the Royal Observatory, to visit Flamsteed. Surprisingly amicable Newton suggested to Flamsteed that he should speak to Prince George of Denmark, Queen Anne’s consort, on Flamsteed’s behalf about obtaining funds to have Flamsteed’s life work published. Flamsteed was agreeable to having his work published especially as his critics, most notably Edmond Halley and David Gregory, were pointing out that he had nothing to show for almost thirty years of endeavour. However he would have preferred to deal with the matter himself rather than have Newton as his broker. Newton spoke to Prince George and obtained the promise of the necessary funds. Meanwhile Flamsteed drew up a publication plan for his work. He wanted three volumes with his star catalogue the high point of his work in the third and final volume. Newton had other plans. He set up an editorial board at the Royal Society consisting of himself, David Gregory, Christopher Wren, Francis Robartes and John Arbuthnot to oversee the publication. Flamsteed, the author and also a member of the Royal Society, was not included. Newton ignored Flamsteed’s wishes and declared that the star catalogue would be printed in volume one. Newton commissioned a printer to print sample sheets, however Flamsteed found them to be of poor quality and wished to find a new printer. Newton ignored him and gave the printer the commission to print the work ordering Flamsteed to supply the introductory material for the first volume.

One major problem was that the star catalogue was at this time not complete. Flamsteed kept stalling declining to supply with Newton with the catalogue until he could complete it. He needed to calculate the stellar positions from the raw observational data. Newton promised him the money to pay the computers and actually obtained the money from Prince George. Flamsteed employed the computers to do the work and paid them out of his own pocket requesting restitution from Newton. Newton refused to pay up. So the whole sorry affair dragged on until Prince George died in 1708 with which the project ground to an end. If Flamsteed had grown to dislike Newton in the 1690s he truly hated him now.

Things remained quiet for two years then at the end of 1710 John Arbuthnot, who was physician to Queen Anne, suddenly announced that Anne had issued a warrant that appointed the president and others as the council of the Royal Society saw fit to be ‘constant Visitors’ of the Royal Society. As used here visitor means supervisor and it effectively meant that Newton was now Flamsteed’s boss. With their newly won authority Newton and his cronies did everything in their power to make life uncomfortable for Flamsteed over the next few years. On 26 October 1711 Newton summoned Flamsteed to a meeting in Crane Court, the home of the Royal Society, to inform him of the state of the observatory instruments. Here we meet a classic of institutional funding. The Crown had paid to have the Royal Observatory built and having appointed Flamsteed to run it the Crown paid his wages, on a very miserly level, however no money was ever supplied for instruments and so Flamsteed had bought his instruments with his own money. When Newton demanded account of the state of the instruments Flamsteed could prove that they were all his own private property and thus no concern of Newton’s. Newton was far from pleased by this defeat. He now ordered the Royal Ordnance to service, repair and upgrade the instruments and thus to win official control over them. Unfortunately the Ordnance, which, like the Mint, occupied the Tower of London didn’t like Newton so taking sides with Flamsteed informed Newton that there were no funds available for this work. A minor victory for Flamsteed but he had already suffered a major defeat. Before discussing this I should point out that contrary to Ms Inglis-Arkell’s claims, at no time did the elderly combatants resort to any form of physical contact.

On 14 March 1711 Arbuthnot had informed Flamsteed that the Queen had commanded the complete publication of his work; the brief reprieve brought about by the death of Prince George was over. Although the star catalogue, which was all that Newton was interested in publishing, was now finished Flamsteed at first prevaricated again. Arbuthnot wrote to Flamsteed requesting him to deliver up the catalogue, Flamsteed declined with further excuses. Newton exploded and shot off a letter ripping a strip of Flamsteed for defying a Royal command and the fight was now effectively over. Flamsteed met with Arbuthnot and handed over the manuscript requesting conditions concerning the printing and editing to which Arbuthnot acquiesced and promptly ignored. Flamsteed went ballistic, as he discovered that printing was going ahead without his knowledge and even worse his manuscript was being edited by Edmond Halley! Flamsteed by now hated Newton but he reserved his greatest loathing for Halley. It has been much speculated why Flamsteed had such an extreme aversion to Halley but it went so far that he refused to use his name and only referred to him as Reimers after Nicolaus Reimers Bär, whom Flamsteed believed had plagiarised his hero Tycho and was thus the most despicable person in the history of astronomy. Flamsteed had lost all down the line and in 1712 his star catalogue appeared in a large folio volume (not the small volume claimed by Inglis-Arkell). Deeply bitter Flamsteed now swore to publish his life’s work in three volumes, as he had originally planned in 1704, at his own expense and began with the preparation. It should be noted that far from ‘Newton being able to influence Queen Anne and Prince George enough to force Flamsteed to publish his data’, Prince George had by now been dead for four years!

However Newton might have won a victory but he hadn’t yet won the war and the tide began finally to turn in Flamsteed’s favour. In 1714 Queen Anne died and was succeeded on the throne by George I, Elector of Hanover. The succession also brought with it a change of government. Now Inglius-Arkell claims that George didn’t like Newton but this is not true. He greatly respected Newton who had long been regarded as the greatest natural philosopher in Europe; he even forced his librarian, Gottfried Wilhelm von Leibniz, who would have loved to have moved to London to escape his Hanoverian backwater (no offense intended to Hannover or the Hanoverians), to stay at home so as not to offend Newton, who was at war with Leibniz when he wasn’t battling Flamsteed. However the succession and the change of government did mean a loss of influence for Newton. In early 1715 Charles Montagu, Lord Halifax, one of the most powerful politicians in England during the previous twenty years and Newton’s political patron, died. Charles Paulet, 2nd Duke of Boulton, the Lord Chamberlin, was a friend of Flamsteed’s and on 30 November 1715 he signed a warrant ordering Newton to return the three hundred remaining copies of the printed star catalogue to Flamsteed. He “made a Sacrifice of them to Heavenly Truth”; i.e. he burnt them.

Flamsteed continued with his project to publish his life’s work at his own expense but died in 1719 before he could finish the project. His widow with the willing help of his two assistants Joseph Crosthwait and Abraham Sharp finished the job and his three-volume Historia coelestis britannica was finally published in 1725, followed by his charts of the constellations the Atlas coelestis, edited by his widow and James Hodgson in 1727. Together they form a fitting monument to one of history’s greatest observational astronomers. Flamsteed had written a long preface for the Historia describing, from his standpoint, in great detail his twenty year long war with Newton but this did not make it into the final printed edition, probably because Newton, by now a living legend, was still very much alive. It only resurfaced a hundred years later. Flamsteed got his revenge, from beyond the grave, on Halley, who followed him as Astronomer Royal. As already explained above, Flamsteed’s observational instruments were his own personal property so when he died his widow stripped the observatory bare leaving Halley an empty building in which to pursue his new office.

The whole, more than twenty year long, farce is one of the more unsavoury episodes in the history of science and certainly not how one would expect two senior officers of state to behave. It is clear that Newton caries most of the blame although Flamsteed was not exactly a model of virtue deliberately fanning the flames through renitent and provocative behaviour. In particular his behaviour towards Halley, who was more than qualified and very capable of editing the star catalogue, was extremely childish and inexcusable.

You might think that I am being very unfair to Ms Inglis-Arkell having turned her very brief account into an overlong post but that is actually the point and her central failure, ignoring all of the factual errors in her version of the story. What I have laid out here are only the bare bones of the whole story, if I were to go into real detail this post would be ten times longer than it already is. Ms Inglis-Arkell attempt to reduce a highly complex series of episodes out of the history of science to a couple of hundred words in a throwaway post could only end in a level of distortion that makes the whole exercise a complete waste of time, effort (not that she seems to expended much of that) and cyberspace.







Filed under Early Scientific Publishing, History of Astronomy, History of science, Newton

Discovery is a process not an act.

This morning somebody on Twitter tweeted that William Herschel discovered the planet Uranus on this day in 1781. A typical tweet amongst history of science fans on Twitter, who like to acknowledge and celebrate births, deaths, inventions and discoveries in what amounts to a rolling history of science calendar. On this occasion my history of science soul sisterTM, Rebekah “Becky” Higgitt, who’s quite knowledgeable about eighteenth-century astronomy, tweeted, quite correctly, that Herschel initially thought he had discovered a comet and it was Nevil Maskelyne, who first suggested that he had in fact observed a new planet and not a comet. She then asked if we should not then say that it was Nevil Maskelyne who discovered Uranus and not Herschel? Becky could be considered a bit biased having fairly recently devoted several years of her life to the study of the life and work of Maskelyne and also having edited a, highly recommended, book on the man. Herschel fans might thus feel justified in dismissing her comment and maintain their position than it was the Hanoverian musician turned amateur astronomer who discovered the first new planet to be observed since antiquity. Rather than trying to stoke the fires of a discovery priority dispute, of which there are all too many in the history of science, I think this an opportunity to look critically at what the term discovery actually means in the history of science.

For some reason we love to hang a specific date, even better the exact time, when a discovery of science was made in the history of science. In fact I have about a running metre of books within arms reach of this computer full of such information. William Herschel discovered Uranus on 13 March 1781, Galileo Galilei discovered the moons of Jupiter on 7 January 1610, Simon Marius did the same just one day later, Johannes Kepler discovered his third law of planetary motion on 8 March 1618 and so on and so forth. However this accurate pinning of scientific or technological discoveries onto the ribbon of time creates a very false impression of what discovery is and this was exactly the point that Becky was trying to make on Twitter, which in turn led to me writing this post. Discovery is not a single act by a single person for which it is possible to give a stopwatch accurate moment of discovery but is rather a process spread over a period of time, which can in fact take several years and which almost always involves quite a large number of people.

To illustrate what this means let us take a closer look at Galileo’s epoch making discovery of the four largest (actually it was only three on the first day) moons of Jupiter. On 7 January 1610 whilst observing the planet Jupiter Galileo noted three stars that roughly formed a line with the middle axis or equator of the planet. When he observed again on the following evening they were still there. You might ask so what? Stars belong to the sphere of fixed stars, which are so called because they ‘always’ remain in the same place, whereas planets are called planets (the Greek for wanderer) because they move around with reference to the fixed stars. This being the case Galileo’s three new stars that he had recorded should have changed their position relative to Jupiter, or more accurately Jupiter should have changed its position relative to the three stars. Galileo was astute enough to realise that he was on to something and continued to observe and record the now four new stars and Jupiter over the following nights. The new stars did change their positions relative to Jupiter but not in the way he would have expected if they were fixed stars plus they always stayed in the vicinity of the planet. With time and enough observations Galileo realised that the four new objects were in fact orbiting Jupiter. He had discovered Jupiter’s four largest moons, or had he?

Science requires that new discoveries can be repeated by other independent practitioners/observers and discoveries are only confirmed and thus accepted when this has taken place. Now as stated above Simon Marius in Ansbach had also first observed the moons of Jupiter just one day later on 8 January 1610 and like Galileo had continued to observe them and had also reached the conclusion that they were orbiting the planet. This would have been the necessary confirmation that Galileo required but Marius only published his observations four years later, in 1614, leading Galileo, who by this time had long been acknowledged as the discoverer to denounce Marius as a plagiarist. Back in 1610 when Galileo fist published his observations on 14 March, in his Sidereus Nuncius, people were, not surprisingly, rather sceptical about his claims.

As I have recorded on several occasions on this blog it was the Jesuit mathematician astronomers under Christoph Clavius at the Collegio Romano who provide the necessary independent confirmation of his observations but this was not a simple process. At first the Jesuits did not have a telescope powerful enough to resolve the moons of Jupiter and their initial attempts to construct one failed. However Grienberger and Lembo persevered with assistance from Galileo, from afar by post, and in the end they were able to confirm all of Galileo’s observations. Another aspect of this discovery was to prove that they were actually moons orbiting Jupiter the four new objects needed to be observed consistently and accurately in order to determine their orbits so that one could predict their positions at any given time. Both Galileo and Marius undertook this task, Marius’ results were more accurate than those of his Tuscan rival, but it was first Cassini several decades later who, with much superior telescopes at his disposal, was able to produce tables of the orbits accurate enough to truly satisfy the requirements of the astronomical community.

It would now seem that we are finished with our tale of the discovery of the four moons of Jupiter but there is another extremely important factor that needs to be addressed. New discoveries often involve new methods and/or new scientific instruments, without which the discovery would not have been possible. This was very much the case with the discovery of the moons of Jupiter, which was only made possible by the very recently invented, September 1608, telescope. Any such new methodology or instrumentation must be clearly and convincingly shown to provide objective verifiable facts based on solid scientific theory. No such demonstration of objective scientific reliability existed at this point in time for the telescope. In fact all those in 1610, who doubted the telescopes ability to deliver objective verifiable scientific facts, and who tend to get ridiculed by the cheerleaders of scientism today, were perfectly correct to do so. Galileo, who when it came to optics was a tinkerer rather than a theorist, was not in the position to deliver the very necessary scientific theory of the telescope. Enter Johannes Kepler.

Kepler had already ready written extensively on theoretical optics including one of the earliest scientific analysis of how lenses functions. He was also an unabashed cheerleader for Galileo’s telescopic discoveries, sight unseen, writing the first positive, rather gushing in fact, review of Sidereus Nuncius, which Galileo used for his own propaganda purposes. Kepler realised at once that in order to confirm those discoveries a theoretical description of how the telescope functions was necessary and he sat down and wrote one. His Dioptrice, which explains the science of single lenses, the convex/concave two lens Dutch telescope used by Galileo, the convex/convex two lens astronomical or Keplerian telescope, the three lens terrestrial telescope and even the telephoto lens, was published in 1611. Galileo, arrogant and egoistical as ever, dismissed it as unreadable but it successfully silenced those who doubted the scientific objectivity of the telescope.

All of the factors that I have described above played an important and indispensible part in the discovery of the four largest moons of Jupiter. What we have here is not the act of one person at a specific point in time, in this case Galileo’s first observation of those three stars, but a chain of intertwined events or a process spread over a period of several years. There is nothing exceptional in the discovery of the moons of Jupiter but all scientific and technological discoveries involve a similar complex process carried out by a group of people over a period of time. Discovery is not the single act of a single person but a process involving several and sometimes many people spread over a period of time. The anniversaries that we like to celebrate are mostly just the starting point to that process.



Filed under History of Astronomy, History of science

A Swiss Clockmaker

We all have clichéd images in our heads when we hear the names of countries other than our own. For many people the name Switzerland evokes a muddled collection of snow-covered mountains, delicious superior chocolates and high precision clocks and watches. Jost Bürgi who was born in the small town of Lichtensteig, in the  Toggenburg region of the canton of St. Gallen on 28 February 1552 fills this cliché as the most expert clockmaker in the sixteenth century. However Bürgi was much more that just a Swiss clockmaker, he was also an instrument maker, an astronomer, a mathematician and in his private life a successful property owner and private banker, the last of course serving yet another Swiss cliché.

As we all too many figures, who made significant contributions to science and technology in the Renaissance we know next to nothing about Bürgi’s origins or background. There is no known registration of his birth or his baptism; his date of birth is known from the engraving shown below from 1592, in which the portrait was added in 1619 but which was first published in 1648. That the included date is his birthday was confirmed by Bürgi’s brother in law.


His father was probably the locksmith Lienz Bürgi but that is not known for certain. About his education or lack of it nothing is known at all and just as little is known about where he learnt his trade as clockmaker. Various speculations have been made by historians over the years but they remain just speculations. The earliest documentary proof that we have of Bürgi’s existence is his employment contract when he entered the service of the Landgrave Wilhelm IV of Hessen-Kassel as court clockmaker, already twenty-seven years old, on 25 July 1579. Wilhelm was unique amongst the German rulers of the Renaissance in that he was not only a fan or supporter of astronomy but was himself an active practicing astronomer. In his castle in Kassel he constructed, what is recognised as, the first observatory in Early Modern Europe.

Wilhelm IV. von Hessen-Kassel Source: Wikimedia Commons

Wilhelm IV. von Hessen-Kassel
Source: Wikimedia Commons

He also played a major role in persuading the Danish King Frederick II, a cousin, to supply Tycho Brahe with the necessary land and money to establish an observatory in Denmark. In the 1560s Wilhelm was supported in his astronomical activities by Andreas Schöner, the son of the famous Nürnberger cartographer, globe and instrument maker, astronomer, astrologer and mathematician Johannes Schöner. He also commissioned the clockmaker Eberhard Baldewein (1525-1593) to construct two planet clocks and a mechanical globe.


Eberhart Baldewein Planet clock 1661 Source: Wikimedia Commons

Eberhart Baldewein Planet clock 1661
Source: Wikimedia Commons

The planet clock shows the positions of the sun, moon and the planets, based on Peter Apian’s Astronomicom Caessareum, on its various dials.


Eberhard Baldewein Mechanical Celestial Globe circa 1573

Eberhard Baldewein Mechanical Celestial Globe circa 1573 The globe, finished by Heinrich Lennep in 1693, was used to record the position of the stars mapped by Wilhelm and his team in their observations.

These mechanical objects were serviced and maintained by Baldewein’s ex-apprentice, Hans Bucher, who had helped to build them and who had been employed by Wilhelm, for this purpose, since 1560. When Bucher died in 1578-1579 Bürgi was employed to replace him, charged with the maintenance of the existing objects on a fixed, but very generous salary, and commissioned to produce new mechanical instruments for which he would be paid extra. Over the next fifty years Bürgi produced many beautiful and highly efficient clocks and mechanical globes both for Wilhelm and for others.

Bürgi Quartz Clock 1622-27 Source: Swiss Physical Society

Bürgi Quartz Clock 1622-27
Source: Swiss Physical Society






Bürgi Mechanical Celestial Globe 1594 Source: Wikimedia Commons

Bürgi Mechanical Celestial Globe 1594
Source: Wikimedia Commons



Jost Bürgi and Antonius Eisenhoit: Armillary sphere with astronomical clock made 1585 in Kassel, now at Nordiska Museet in Stockholm. Source Wikimedia Commons

Jost Bürgi and Antonius Eisenhoit: Armillary sphere with astronomical clock made 1585 in Kassel, now at Nordiska Museet in Stockholm.
Source Wikimedia Commons

Bürgi was also a highly inventive clockmaker, who is credited with the invention of both the cross-beat escapement and the remontoire, two highly important improvements in clock mechanics. In the late sixteenth century the average clocks were accurate to about thirty minutes a day, Bürgi’s clock were said to be accurate to less than one minute a day. This amazing increase in accuracy allowed mechanical clocks to be used, for the first time ever, for timing astronomical observations. Bürgi also supplied clocks for this purpose for Tycho’s observatory on Hven. In 1592 Wilhelm presented his nephew Rudolph II, the German Emperor, with one of Bürgi’s mechanical globes and Bürgi was sent to Prague with the globe to demonstrate it to Rudolph. This was his first contact with what would later become his workplace. Whilst away from Kassel Bürgi’s employer, Wilhelm died. Before continuing the story we need to go back and look at some of Bürgi’s other activities.

As stated at the beginning Bürgi was not just a clockmaker. In 1584 Wilhelm appointed the Wittenberg University graduate Christoph Rothmann as court astronomer. From this point on the three, Wilhelm, Rothmann and Bürgi, were engaged in a major programme to map the heavens, similar to and just as accurate, as that of Tycho on Hven. The two observatories exchanged much information on instruments, observations and astronomical and cosmological theories. However all was not harmonious in this three-man team. Although Wilhelm treated Bürgi, whom he held in high regard, with great respect Rothmann, who appears to have been a bit of a snob, treated Bürgi with contempt because he was uneducated and couldn’t read or write Latin, that Bürgi was the better mathematician of the two might have been one reason for Rothmann’s attitude.

In the 1580s the itinerant mathematician and astronomer Paul Wittich came to Kassel from Hven and taught Bürgi prosthaphaeresis, a method using trigonometric formulas, of turning multiplication into addition, thus simplifying complex astronomical calculations. The method was first discovered by Johannes Werner in Nürnberg at the beginning of the sixteenth century but he never published it and so his discovery remained unknown. It is not known whether Wittich rediscovered the method or learnt of it from Werner’s manuscripts whilst visiting Nürnberg. The method was first published by Nicolaus Reimers Baer, who was then accused by Tycho of having plagiarised the method, Tycho claiming falsely that he had discovered it. In fact Tycho had also learnt it from Wittich. Bürgi had expanded and improved the method and when Baer also came to Kassel in 1588, Bürgi taught him the method and how to use it, in exchange for which Baer translated Copernicus’ De revolutionibus into German for Bürgi. This was the first such translation and a copy of Baer’s manuscript is still in existence in Graz. Whilst Baer was in Kassel Bürgi created a brass model of the Tychonic geocentric-heliocentric model of the cosmos, which Baer claimed to have discovered himself. When Tycho got wind of this he was apoplectic with rage.

In 1590 Rothmann disappeared off the face of the earth following a visit to Hven and for the last two years of Wilhelm’s life Bürgi took over as chief astronomical observer in Kassel, proving to be just as good in this work as in his clock making.

Following Wilhelm’s death his son Maurice who inherited the title renewed Bürgi’s contract with the court.


Kupferstich mit dem Porträt Moritz von Hessen-Kassel aus dem Werk Theatrum Europaeum von 1662 Source: Wikimedia Commons

Kupferstich mit dem Porträt Moritz von Hessen-Kassel aus dem Werk Theatrum Europaeum von 1662
Source: Wikimedia Commons

However Maurice did not share his father’s love of astronomy investing his spare time instead in the study of alchemy. Bürgi however continued to serve the court as clock and instrument maker. Over the next eight years Bürgi made several visits to the Emperor’s court in Prague and in 1604 Rudolph requested Maurice to allow him to retain Bürgi’s services on a permanent basis. Maurice acquiesced and Bürgi moved permanently to Prague although still remaining formally in service to Maurice in Kassel. Rudolph gave Bürgi a very generous contract paying him 60 gulden a month as well as full board and lodging. As in Kassel all clocks and globes were paid extra. To put that into perspective 60 gulden was a yearly wage for a young academic starting out on his career!

In Prague Bürgi worked closely with the Imperial Mathematicus, Johannes Kepler. Kepler, unlike Rothmann, respected Bürgi immensely and encouraged him to publish his mathematical works. Bürgi was the author of an original Cos, an algebra textbook, from which Kepler says he learnt much and which only saw the light of day through Kepler’s efforts. Kepler was also responsible for the publication of Bürgi’s logarithmic tables in 1620.


Bürgi's Logarithmic Tables Source: University of Graz

Bürgi’s Logarithmic Tables
Source: University of Graz

This is probably Bürgi’s greatest mathematical achievement and he is considered along side of John Napier as the inventor of logarithms. In many earlier historical works Bürgi is credited with having invented logarithms before Napier. Napier published his tables in 1614 six years before Bürgi and is known to have been working on them for twenty years, that is since 1594. Bürgi’s fan club claim that he had invented his logarithms in 1588 that is six years earlier than Napier. However modern experts on the history of logarithms think that references to 1588 are to Bürgi’s use of prosthaphaeresis and that he didn’t start work on his logarithms before 1604. However it is clear that the two men developed the concept independently of each other and both deserve the laurels for their invention. It should however be pointed out that the concept on which logarithms are based was known to Archimedes and had already been investigated by Michael Stifel earlier in the sixteenth century in a work that was probably known to Bürgi.

Through his work as clock maker Bürgi became a very wealthy man and invested his wealth with profit in property deals and as a private banker lending quite substantial sums to his customers. In 1631 Bürgi, now 80 years old, retired and returned ‘home’ to Kassel where he died in January of the following year shortly before his 81st birthday. His death was registered in the Church of St Martin’s on the 31 January 1632. Although now only known to historians of science and horology, in his own time Bürgi was a well-known and highly respected, astronomer, mathematician and clock maker who made significant and important contributions to all three disciplines.




Filed under History of Astronomy, History of Mathematics, History of science, Renaissance Science, Uncategorized

From astronomy to literature – Bridging the gap

Recent years have seen more and more people proclaiming a crisis in the humanities. In an age where politicians seem to have mutated into one-track worshippers of the Gods of Mammon anything, which can’t be measured in terms of the profits it will generate, preferably in the short rather than the long-term, is placed on the list for defunding. Humanities departments are ‘downsized’ (a hideous euphemism), threatened with closure or simply closed as not cost-effective. In an aged increasingly dominated by a weird mix of profit maximisation and techno-scientism the humanities have apparently been weighed and not found wanting, but categorised as superfluous to requirements. In this situation it is helpful to be reminded that the sciences and humanities have throughout their existence regularly stimulated and cross-fertilised each other. Within the history of science one historian who dedicated her life to documenting and illuminating that symbiosis was Marjorie Hope Nicolson (1894–1981), who devoted her ample talents to examining the connections between literature and science during the so-called scientific revolution. I’m quite happy to state that in my early days as a wannabe historian of science Marjorie Hope Nicolson was one of my guiding lights showing me that science is not an activity divorced from society but one deeply immersed in it. This lady of literature and science has found a worthy successor in Anna Henchman and her recently published work The Starry Sky Within: Astronomy & the Reach of the Mind in Victorian Literature[1].


The nineteenth century saw, with major developments in a wide spectrum of scientific disciplines, in what some have called the second scientific revolution. Already beginning in the late eighteenth century both physical optics and astronomy experienced wide reaching advances, which in turn led to an extensive reconsideration of humanities’ place in the world and the world’s place in the cosmos. It is this reassessment of humankind’s vision of itself and its place in the cosmos, its origins in the sciences of optics and astronomy and its reflections in the contemporary literature that forms the subject of Henchman’s book.

Mercury Venus

Following an introduction laying out her game plan and introducing the reader to various concepts important to her theme the book is divided into two sections Observers in Motion and Astronomy and the Multiplot Novel. In the former Henchman takes the reader through a discussion of astronomy, optics and points of view centred around the writings of John Herschel, probably the most significant figure in both astronomy and optics in Britain in the first half of the nineteenth century. Then moving on to a wider sweeping discussion of philosophical perspectives. Next up is journalist and essayist Thomas de Quincy, best known to modern readers for his Confessions of an Opium-Eater (which your reviewer confesses to having read in his youth) but here considered for his attempts to come to terms with the emerging modern astronomy and cosmology in his 1846 essay Systems of the Heavens as Revealed by Lord Rosse’s Telescopes. Rosse had the largest and most powerful telescopes in the world constructed at his observatory in Ireland and did much to open up the field of deep space astronomy inaugurated by Charles Messier and William Herschel in the eighteenth century. This work did much to unsettle mankind’s view of the universe and its place in it. This disturbance is the subject of de Quincy’s essay, which Henchman dissects, from several different directions, with great skill. The third and final part of the first section concerns itself with the way that the new astronomy is reflected in the work of one of the Victorian period’s most loved poets, Alfred Lord Tennyson. To quote just one sentence, “Tennyson is unique among his contemporaries, not perhaps in the extent to which he uses stellar imagery, but in the extent to which he requires that imagery to be consistent with astronomical observation”.


The second section of the book turns, as its title clearly states, to the nineteenth-century multiplot novel and the analogies to be found there to the astronomical universe, which in the nineteenth century was rapidly transitioning from the comparatively small and homely cosmos that humanity had inhabited, as the centre of, from the beginnings of human awareness up to the eighteenth century into a the vast unfathomable space of multitudinous galaxies a small corner of which we inhabit today. After a brief introductory chapter aptly entitled Novels as Celestial Systems Henchman delivers two chapters of in depth analysis of the works of Thomas Hardy and George Eliot. The second section, and the book, closes out with the chapter Narratives on a Grand Scale: Astronomy and Narrative Space in which Henchman suggests, “…that much as individual characters have cosmological conceptions–views of the totality of things– so do works of fiction. Novelists such as Hardy, Leo Tolstoy, and Charles Dickens create fictional cosmoses, each of which behaves according to a logic of its own. This unstated logic makes an entire narrative space feel stable or unstable, coherent or incoherent, complete or partial.” This chapter closes with a comparison, in these terms, of the presentations of the Napoleonic wars in Hardy’s The Dynasts and Tolstoy’s War and Peace.

Mud moulded ball

At the beginning of her brief five-page conclusion Henchman questions her own title. “What, then, is the sky within?” Her book is a stimulating and provocative attempt to answer this question for Victorian writers and their attitude to the rapidly changing, expanding and challenging science of astronomy in their century. Henchman in, what is a comparatively short book packed full of information and analysis, very deftly juggles a large amount knowledge from the fields of nineteenth-century literature, astronomy, cosmology, philosophy, and optics together with modern philosophy and literature theory. The stimulating text is complimented with many well-chosen astronomical and optical illustrations printed in engaging shades of grey (Three of which appear above). An important aspect of any academic book is the academic apparatus, which is here first class. Extensive and informative endnotes (that I, like most academic readers, prefer footnotes to endnotes should already be well known to regular readers of this blog!) are complimented by an equally extensive bibliography and a comprehensive index.

This is very clearly an academic rather than a popular or semi-popular book and it can and, in my opinion, should be read by any academic from student through doctoral student to lecturer and professor not only in literature studies but also in the history of science or nineteenth-century history in general. All of these would benefit from reading this book with its all-round perspective crossing numerous discipline boundaries. It would be a great win for the more general reader if Henchman were to turn her obvious scholarly and writing talents to producing a more popular version of her research in a further volume. I learned much reading this book and I’m certain that many others will also do so.




[1] Anna Henchman, The Starry Sky Within: Astronomy & the Reach of the Mind in Victorian Literature, Oxford University Press, Oxford, 2014


Filed under Book Reviews, History of Astronomy, History of science

The specialist in causing pain.

I suppose I ought to rebrand Galileo Galilei as ‘The Gift that keeps on Giving”! The comment is of course directed at all the idiots who think they need to present their image of Galileo to the world, rather than at the 16th- and 17th-century Tuscan artist-engineer himself. As long as there is a GG Super Star I will never be short of material for this blog, although it might become a little bit monotone with time. The most recent offender is Michael Vagg on The Conversation in an article entitled Four things we should teach every kid about Galileo. Before looking at Mr Vagg’s contribution to the Galileo debate I want to waste a few words on The Conversation, which describes itself as follows:

The Conversation is a collaboration between editors and academics to provide informed news analysis and commentary that’s free to read and republish.

Its banner head also has the subtitle “Academic rigour, journalistic flair”. Apparently, at least judging by Mr Vagg’s article, this proud boast doesn’t apply when it comes to the history of science.

Mr Vagg, Clinical Senior Lecturer at Deakin University School of Medicine & Pain Specialist at Barwon Health, apparently recently attended a conference in Florence and took time out to visit the Museo Galileo, a laudable way to spend his free time. He tells us he bought three books from the gift shop one of which was Galileo: Antichrist, which he describes, a serious scholarly attempt to look behind the obvious motives for his trial and punishment by the Church to some of the contemporary nuances, going on to say that he highly recommend[s] it, if you’re a Galileo freak and historical conspiracy theory enthusiast like me. Unfortunately Mr Vagg is mistaken in his assessment of this book. Of all the more recent publication about Galileo, provoked by the four hundred and fiftieth anniversary of his birth, Galileo: Antichrist is one of the worst. A popular biography written by Michael White it turns back the clock by about two hundred years and presents a vision of Galileo’s life and work that would be comfortably at home at the beginning of the nineteenth century, full of myths and distortion and not to be recommended to anybody who serious wants to know the historical truth about Galileo Galilei. Mr Vagg seems to have largely based his “four truths” on Whites totally distorted view of Galileo and his achievements.

His first “truth is entitled “He got rid of Aristotle from science” and I reproduce the whole of his section to this theme, which is to put it mildly horrendous. His first paragraph reads as follows:

Before Galileo, science (known then as natural philosophy) was based almost entirely on the writings of Aristotle. St. Thomas Aquinas enshrined a huge amount of Aristotle’s teachings about the natural world as Church-approved dogma without any empirical basis. Until the Renaissance, virtually nobody in Europe or anywhere else apart from Arabic geniuses like Ibn Sina and Ibn Rushd advanced science by paying attention to the real world. They just looked up what Aristotle had to say and left it at that, even if what they observed was at odds with what they read.

One of my favourite historians of medieval science, David C Lindberg, died a couple of weeks ago and he would be spinning in his grave if he knew of this travesty of his disciple, which reads like something from the beginning of the nineteenth century or even from the Renaissance. It was Renaissance scholars who were initially responsible for this wholly false picture of medieval science. They created the myth that the golden age of antiquity created a cornucopia of knowledge that got lost with the collapse of the Roman Empire and that they were responsible for the rebirth (renaissance) of this knowledge, freeing Europe from the dark ignorance of the intervening period, which they termed the Middle Ages. This myth was perpetuated right up into the nineteenth century, when the French physicist and historian of science, Pierre Duhem, became the first person to challenge it. Throughout the twentieth century a series of brilliant historians of science, including such people as Marshall Clagett, Alistair Crombie, John Murdoch, Edward Grant, the afore mentioned David Lindberg and others, completely dismantled this myth showing that European medieval scholars made significant contribution to the evolution of science; contribution on which people such as Galileo built their own contributions.

To give one example that is very relevant to Galileo and his theories of motion called revolutionary by Vagg. Even Aristotle was aware of the fact that his laws of motion were anything but satisfactory and the first person to subject them to serious scrutiny was John Philoponus in the sixth century CE, who developed the impetus theory, which was developed further by Arabic scholars in the twelfth and thirteenth centuries and by Buridan in Europe in the fourteenth century. Galileo well aware of this work adopted the impetus theory early in his own work on kinetics before moving on to an incorrect form of the theory of inertia. (Galileo still considered natural motion to be circular, not linear, an Aristotelian concept!) In the fourteenth century the so-called Oxford Calculatores of Merton College developed the mathematical mean speed theory, which is to all intents and purposes Galileo’s law of fall. One of the so-called Paris physicists Nicolas Oresme produced a geometrical proof of this theory, in the form of a graph, which is identical to the proof given by Galileo for his law of fall in his Discorsi more than three hundred and fifty years later. It was also the invention of spectacles in the late thirteenth century that would eventually lead to the invention of the telescope, the instrument that would make Galileo famous. Far from being scientifically sterile the Middle Ages was the very fertile seed bed in which Galileo’s own scientific ideas grew to maturity.

In his second paragraph in this section Vagg dished up the following:

Galileo did more than anyone else to rid natural philosophy of its reliance on the authority of Aristotle, replacing it with an empirical and mathematical method. Deciding scientific knowledge by scholarly argument rather than doing experiments seems bizarre to us now. Galileo showed again and again that mathematical models could yield results that were reproducible by anyone else and disproved Aristotle’s observations. Eventually, the successes of the new way of doing natural philosophy were too overwhelming to ignore. The Aristotelians slunk off to find other occupations. Galileo showed irrefutably that you couldn’t do science by magisterial authority alone. Your results had to stand up to scrutiny in the real world.

As I explained in an earlier post, that earned me my reputation as a Galileo deflator, Johannes Kepler, Thomas Harriot, Christoph Scheiner, William Gilbert, Christoph Clavius, Francoise Vieta, Isaac Beeckman and Simon Stevin, all roughly contemporaries of Galileo, all did at least as much, and some of them more than, Galileo in establishing the ‘new’ experimental mathematics based science in the early seventeenth century and the myth of Galileo as the great Aristotle slaying champion is one that needs to be firmly stamped on. Also modern history of science has shown that many aspects of Aristotle’s philosophy continued to exercise a strong influence on the development of science well into the seventeenth century long passed the death of Galileo.

Vagg’s second point is actually a very good one and would have been praise worthy if he hadn’t gone on to spoil it in the detail. His title is, “He was not the prototype of a misunderstood lone genius”. This is very correct and in fact the misunderstood lone genius is not only a myth but also a chimera, there has never been one. This is in fact an important point that should indeed be taught to every school kid as part of their science courses, however Vagg goes on to spoil it by presenting a totally mythical picture of Galileo.

Galileo was very much not a lone genius. He relied on Guidobaldo del Monte and Christopher Clavius to get both of his jobs as professor of mathematics and early in his career he relied on the transcript of the lectures from the Collegio Romano to deliver his own lectures. As a young researcher he spend long periods brainstorming with del Monte and Paolo Sarpi over a wide range of topics. Sometimes it is not possible to tell if the ideas he made public really were his own or ones borrowed from one or other of those intellectual partners. For his telescope and instrument making he employed and relied heavily on a technician, who usually doesn’t get the credit he deserves. For his excursions into applied science and technology in the arsenal in Venice he relied heavily on the guidance of master ship builders. Later in life following his overnight fame he relied on his fellow members of the Accademia dei Licei as sounding boards for his ideas and those lynx-eyed friends also prepared his works for publication and published them. Even after his fall, under house arrest, Galileo had students and his son helping with his scientific work. Galileo was for most of his life part of a network of like-minded friends and assistants, however this is not the story that Vagg presents.

When he published the Starry Messenger to announce his discovery of the moons of Jupiter with his new telescope, he not only sent out copies of his books to his colleagues, but also sent them better telescopes than the ones they had!

I suggest Vagg should read Mario Biagioli’s Galileo Courtier and Galileo’s Instruments of Credit. Galileo did not send copies of the Sidereus Nuncius or telescopes to his colleagues; he sent them to civil and religious potentates who could help him in his ambitions to climb the social greasy pole. Despite requests for a telescope Kepler had to wait till a passing aristocrat graciously let him borrow one for a couple of hours to see the new astronomical discoveries. Galileo ignored Kepler’s friendly collegial overtures until he, Kepler, became the only person to support without confirmation those discoveries, publishing Kepler’s letter without his knowledge or permission. Later he ridiculed Kepler’s groundbreaking book on the optics of the telescope as unreadable. He ignored Kepler’s work on heliocentricity when writing the Dialogo, despite the fact that it was the best available on the subject, whilst ridiculing Tycho’s work. When he and Scheiner both discovered the sunspots he accused Scheiner, unjustifiably, of plagiarism and then published some of Scheiner’s results in the Dialogo as his own. In the dispute over the nature of comets with Grassi he viciously attacked Grassi exposing him to public ridicule with malicious polemic, although scientifically Grassi was right and he, Galileo, was wrong. As he and Marius both independently discovered the moons of Jupiter he accused Marius of plagiarism, a charge that stuck ruining Marius’ reputation until it was restored at the beginning of the twentieth century.

This is the man who Vagg claims was “a practising believer in developing a scientific consensus”. Galileo did not believe in scientific consensus, he was a man with a monstrous ego who was right and anybody who disagreed with him got mauled viciously for his troubles. Vagg writes rather pathetically:

He was revered in his lifetime by every natural philosopher of note, although some of ones he personally insulted were somewhat grudging in their admiration.

He was justifiably intensely disliked and despised by quite a few natural philosophers of note. Vagg does however point out that Galileo was not perfect:

He could, of course, also be spectacularly wrong. Nobody remembers his views on comets and the causes of tides, which were two of the biggest contemporary scientific controversies he weighed into. It should also be pointed out that these were the two most prominent examples where Galileo was being particularly stubborn in holding out against the prevailing tide of opinion.

A lot of historians of science remember his views on comets and the causes of tides very well indeed.

The title of Vagg’s next section is also correct, “He was genuinely interdisciplinary” but then again so were all his contemporaries, our concept of the single disciple specialist or expert didn’t exist in the Renaissance. However in his description of Galileo’s multifarious activities Vagg makes several serious blunders. He tells us:

While his astronomical work may seem like it had no practical applications, it led him to develop a way of measuring longitude at sea that was not surpassed until more than 150 years later.

Galileo did conceive a method of using the eclipses of the moons of Jupiter by the planet, as they orbited it, as a clock with which to determine longitude. However, he never succeeded in determining the orbits accurately enough for this purpose, a task first completed by Cassini many decades later. Also more importantly, although this method could be and was used successfully on land, for cartographical purposes, it could never be used at sea, a ship being far too unstable to make the necessary highly accurate astronomical telescopic observations. It is of historical interest that the chronometer method and the lunar distance method of determining longitude, which were the methods that would eventually solve the problem, were both proposed long before Galileo was even born. Next up we get informed that:

He translated his knowledge of the abstract mathematical minutiae of optics into building much better telescopes than anyone else had. He extended this theory to conceive and design the microscope as well.

With the exception of Yaakov Zik, almost all historians of the telescope think that Galileo had very little knowledge of geometrical optics and in fact used his skills as an instrument maker to develop his telescopes by simple trial and error. Although no single inventor of the microscope is known to us, as I’ve already written in an earlier post, Galileo was almost certainly one of the inventors of the microscope an instrument that he, according to his own testimony, discovered by accident when he put one of his telescopes to his eye the wrong way round. He then improved on this accidental discovery, again not by using the theory of geometrical optics, but by trial and error.

The military compass described by Vagg was in fact invented by del Monte and only manufactured and sold along with instruction courses in its use by Galileo as an additional source of income. Vagg closes out this section with a final error:

In the final year of his life, having gone totally blind, Galileo conceived and dictated the design for a clock escapement which was very similar to the one used by Huygens to construct the first pendulum clock a couple of decades later.

The pendulum clock escapement conceived by Galileo but never really realised was substantially different to the one developed by Huygens decades later.

Vagg’s fourth point worthy of the attention of school kids is, “He stood up for the philosophy of science”. Whilst this statement does contain more than a grain of truth Vagg again succeeds in on presenting a largely false historical picture to illustrate it.

Despite using maths that is now taught in high school and equipment that would embarrass a 21st century toy shop owner, Galileo utterly changed the way his contemporaries saw themselves in the universe. Educated citizens of his time had a sophisticated explanation of the world and the heavens, but it was based on dogma and supposition to a degree that is very hard to comprehend today. By making arguments that were based on reasoning, mathematics and experimental verification, he was consistently and obviously successful with many of his predictions. This opened his contemporaries’ eyes to the extraordinary possibilities on offer with knowledge gained by the scientific method.

This paragraph contains a complete misrepresentation of the general state of science at the time of Galileo. Those things that Vagg praises Galileo for had been gaining ground strongly throughout European science for more than a century before Galileo made any contributions to the topic at all. Since the High Middle Ages people had been making contributions to science based on reasoning, mathematics and experimental verification. Galileo made an important contribution to this trend but he didn’t start it. It should also not be forgotten that Galileo used this methodology when it suited him but also resorted to polemic and brow beating when it suited him better. His dispute with Grassi on the nature of comets is a good example of this behaviour.

Observing that Venus had phases like the moon, and having plotted the orbits of the Galilean satellites meticulously, he could join the dots conceptually, and followed the chain of reasoning to the end. The results were not what he was originally looking to discover, but he just couldn’t turn his back on his data. Earth was demoted from the fixed centre of the medieval universe to just another planet orbiting the sun. He strenuously sought ways to avoid provoking the Church (he was a devout believer right to the end) but he could not stop progressing and disseminating his research, despite those who told him it was safer to pull his head in.

Maybe I’m misreading this but it appears to me that Vagg is implying that Galileo initiated the heliocentric model of the cosmos, has he never heard of Copernicus or Kepler? Also, as I’ve written in detail in other posts, the telescopic discoveries made by Galileo, Scheiner, Marius, Harriot and others, whilst refuting a pure Ptolemaic geocentric model, were a long way from confirming a heliocentric model and were also conform with various Tychonic and semi-Tychonic models. These facts alone constitute an important lesson in how science evolves.

“He strenuously sought ways to avoid provoking the Church” is another mythical statement from Vagg. One of Galileo’s major problems was that his mega ego prevented him from seeing when he was provoking those that he attacked, mocked, contradicted. Convinced of his own innate superiority he just blundered from one provocation to the next. A seemingly trivial point, but actually not so trivial, is the claim “he was a devout believer right to the end” this, or something similar is a standard part, of the Galileo mythology trotted out by almost everyone who has put pen to paper or fingers to keyboard to write about the man. However, David Wootton in his biography, Galileo: Watcher of the Skies, a genuinely ‘serious scholarly’ book, argues very convincingly that far from being the devout Catholic of popular science literature, Galileo was in fact a very lax Catholic. This of course rather spoils the common plaint, ‘he was a true believer and still they punished him’ of the ‘Galileo was a martyr for science’ fan club.

He insisted that dependable, reproducible scientific results should trump religious dogma or non-empirical philosophical ideas any day of the week. He paid a price for his abrasiveness, but he should not be remembered just for the events that blighted his later years. His persecution and house arrest by the Vatican were not inevitable, but threw into sharp focus the clash of his era between a recognisably modern science-based worldview and the medieval superstition of authoritarian belief systems. Somebody had to be the first to point out the Emperor’s new clothes.

The last couple of lines of the previous paragraph and this one refer, of course, to the publication of Galileo’s Dialogo and his subsequent trial by the Inquisition of Rome. Unfortunately Galileo’s masterpiece didn’t rely on ‘dependable, reproducible scientific results’ because they didn’t exist for the heliocentric theory, instead he used polemic and sleight of hand to confuse, bamboozle and confound his opponents hoping that nobody would notice how thin his scientific arguments actually were. The whole book was of course structured around the fourth and final section, Galileo’s theory of the tides, (which Vagg so casually swept aside above) that he, in a strange fit of blind arrogance, believed to be the missing empirical proof that the earth moved, the lack of such proof being the strongest scientific argument against the heliocentric hypothesis. Originally Galileo wanted to give the whole book the title Theory of the Tides but the Church censor wouldn’t permit it, so he chose the title that has gone down in history instead. Galileo thought that this theory was his all-winning trump, whereas it was in reality a busted flush, as any half thinking person could have told him. Galileo did not write the book in opposition to the Church but with the Pope’s explicit permission. However Urban, not unreasonably, commissioned him to write a book presenting the various cosmological/astronomical models of the cosmos factually and without favour or prejudice. If Galileo had written a book presenting the arguments for and against geocentricity, heliocentricity and helio-geocentricty (he completely ignored the latter, although at the time he wrote it was the model that best fit the known scientific facts) fairly and honestly, we probably wouldn’t waste so much time discussing the conflict between him and the Church because there wouldn’t have been one. Instead he wrote a book, which was an undisguised polemic in favour of heliocentricity hoping nobody would notice the lack of real empirical evidence and finished it off by gratuitously insulting the Pope. Wow really clever GG! The clash between worldviews that Vagg so pathetically evokes at the end of this paragraph exists only in his fantasy and not in the historical reality. The clash between Galileo and Urban was on a very personal level and in no way reflects a general clash between the then theological worldview and, to quote Vagg, a recognisably modern science-based worldview. This supposed clash is a myth created in the nineteenth century that has long been demolished by historians of science but people like Vagg prefer to keep peddling the myths rather than taking the trouble to learn the truth. Possible the worst piece of claptrap in Vagg’s ahistorical article is his closing sentence.

I am however eternally grateful for the effect his life’s work had on the philosophy of science. Development of the Enlightenment values that underpin our society would not have been possible without the seismic burst of rationalism that Galileo unleashed from his villa in Northern Italy 500 years ago.

Wow Mr Vagg, you have set a new high water mark in ahistorical mythical hagiography. At least it will provide employment for lots of historians rewriting all those history books that missed out on GG’s vital role in the Enlightenment. Mr Vagg, pain specialist, your pathetic attempts to write history of science, a subject you very obviously know nothing about, has certainly caused this historian of science a great deal of pain indeed.



Filed under History of Astronomy, History of science, Myths of Science, Renaissance Science

The Simon Marius Anniversary Celebrations 2014 have been a great success

On the 8 January 1610 the Ansbach court astronomer Simon Marius first observed the four largest moons of Jupiter just one day later than Galileo Galilei, although he would delay four years before publishing the results of his observations unlike his Tuscan rival, who famously rushed into print with his amazing discovery. It seemed somehow appropriate to post this press release here on this anniversary of that, for Marius, momentous event.

Press Release – The Simon Marius Anniversary Celebrations 2014 have been a great success.

The initiators of the ‘The Simon Marius Anniversary Celebrations 2014’ can look back over a very eventful year. More than 60 lectures and exhibitions corrected the public image of the margravial court astronomer both at home and abroad, and more than 200 articles appeared in newspapers, magazines, and other media. Motivation was the publication of Simon Marius’ magnum opus Mundus Iovialis (The World of Jupiter) four hundred years ago in 1614.

The first high point of these activities was the launching of the Marius-Portal,, in The State Archives in Nürnberg. This Internet site contains a bibliography, with 28 menu languages, of all the publications by or about Simon Marius (1573-1624), who discovered the four largest Jupiter moons at the same time but independently of Galileo Galilei in 1610. A substantial number of these publications have been digitised and can – where legally permitted – be viewed directly. The medium-term aim is to create a virtual ‘Collected Works’.

The designation of an asteroid by the International Astronomical Union was very pleasing. The asteroid “(7984) Marius” is about 10 km in diameter and is situated in the so-called main belt between Mars and Jupiter. It orbits the sun once every 4.27 years and travels at a speed of 7.57 km/s.

The final high point was the conference “Simon Marius und seine Zeit” (Simon Marius and his Times), which focused on the results of his researches. The conference report will appear in 2015.

Galileo Galilei had accused the margravial court astronomer of plagiarism, however at the beginning of the 20th century he was rehabilitated and in 2014 Simon Marius was honoured in particular in Southern Germany but also in the Cosmonaut Museum in Moscow and in the USA. Galileo and Marius discovered the four largest Jupiter moons in January 1610, but Marius first published his results four years later than his Italian colleague. Today we know that in the 17th century Marius was an astronomer at the highest European levels.

The ‘The Simon Marius Anniversary Celebrations 2014’ was initiated by the Nürnberger Astronomischen Gesellschaft (Nürnberger Astronomical Society) and will be set forth by the Simon Marius Gesellschaft (Simon Marius Society), which was founded at the end of December 2014.

Any readers who wish to do so are cordially invited to become a normal or corresponding member of the Simon Marius Society, membership is free.


Filed under History of Astronomy, Local Heroes, Renaissance Science