Ptolemy completes the Almagest
Ptolemy completes the Almagest
Overview
Around 150 CE, Claudius Ptolemy completed the Almagest, a thirteen-book synthesis of Greek mathematical astronomy centred on a geocentric model of deferents and epicycles. It contained a star catalogue, geometrical methods and quantitative predictions for every planet, the Sun and the Moon. For over fourteen centuries it remained the authoritative astronomical textbook across the Islamic world and Europe, and its eventual supersession marked the beginning of the scientific revolution.