Claudius Ptolemy described the solar system as being geocentric. What does this mean and when did he say it?
We find the idea of a geocentric (earth-centered) system set down in Ptolemy's Almagest, which was written in the 2nd century. We can't be much more accurate as regards the dating of this most remarkable publication. And it should be noted that Ptolemy stated he derived a good portion of his information from several earlier scholars. Ptolemy was not the originator of the geocentric model of our system. The idea had been proposed several hundred years earlier. A link is provided below.