Claudius Ptolemy (c. 100 to c. 170 CE) was an Alexandrian mathematician, astronomer, and geographer. His works survived antiquity and the Middle Ages intact, and his theories, particularly on a geocentric model of the universe with planets following orbits within orbits, were hugely influential until they were replaced by the heliocentric model of the universe proposed by Copernicus and Galileo.
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Definition
Timeline
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c. 100 CE - c. 170 CELife of the Alexandrian astronomer and geographer Claudius Ptolemy.
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c. 150 CE - 1150 CEClaudius Ptolemy publishes Almagest, which becomes the primary book on astronomy.
