What was ptolemy famous for?
This seems like a pretty resourceful link, the information you seek is definitely here. http://www-history.mcs.st-and.ac.uk/Biographies/Ptolemy.html One of the most influential Greek astronomers and geographers of his time, Ptolemy propounded the geocentric theory in a form that prevailed for 1400 years. However, of all the ancient Greek mathematicians, it is fair to say that his work has generated more discussion and argument than any other. We shall discuss the arguments below for, depending on which are correct, they portray Ptolemy in very different lights. The arguments of some historians show that Ptolemy was a mathematician of the very top rank, arguments of others show that he was no more than a superb expositor, but far worse, some even claim that he committed a crime against his fellow scientists by betraying the ethics and integrity of his profession. We know very little of Ptolemy’s life. He made astronomical observations from Alexandria in Egypt during the years AD 127-41.
