Ptolémée

Claudius Ptolemy was a Greco-Egyptian astronomer and mathematician who lived in the 2nd century AD. He is best known for creating the Ptolemaic model of the universe, which placed the Earth at the center and explained the motions of planets and stars through a system of circles called epicycles. This geocentric model was widely accepted for over a thousand years. Ptolemy also made important contributions to geography, optics, and astrology, and his works influenced science and astronomy until the heliocentric model proposed by Copernicus in the 16th century.