The German verb fremdgehen means to be unfaithful or to have a bit on the side in English. Regular visitors to this blog will know that the Renaissance Mathematicus is from time to time unfaithful and posts his scribblings in other places on the Internet. This has happened once again and I am actually pleased to announce that I have a post up on Andreas Sommer’s excellent blog Forbidden Histories. Andreas specialises in exposing the non-scientific underbelly of the history of science. Andreas asked me if I could write something on the history of astrology and I put together an overview of the common histories of astronomy and astrology: Astronomy and Astrology: The Siamese Twins of the Evolution of Science, which you can go over and read as of now. There is probably nothing new for those, who have read all of my previous astrology posts but I hope that what I have written is a short and informative introduction to the topic.