Ptolemy of Alexandria

Ptolemy of Alexandria was a Greek mathematician and astronomer who lived in the 2nd century CE. He is best known for his work on the geocentric model of the solar system, where the Earth is at the center and the planets orbit around it. His book, Almagest, was a comprehensive treatise on astronomy and remained the standard reference for over a thousand years. He also made significant contributions to the field of geography and cartography. Despite his many achievements, his work was later challenged by the heliocentric model of Aristarchus.