1. Claudius Ptolemy
He did his major works in Alexandria, which was the center of Greek learning. His name Claudius Ptolemy, is a mixture of the Greek Egyptian "Ptolemy" and the Roman "Claudius". ... Ptolemy studied mathematics to help work in geography and astronomy. ... Ptolemy constructed many major works about mathematical theories about the universe and planets. ... Ptolemy was one of the most influential Greek astronomers and geographers of his time. ...
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