Detail from page of a Latin edition of the Almagest showing students receiving instruction from Astronomy, personified as a woman, who gestures at the stars, with text and decorated borders showing animals using astronomical instruments, 14th century. The


Detail from page of a Latin edition of the Almagest showing students receiving instruction from Astronomy, personified as a woman, who gestures at the stars, with text and decorated borders showing animals using astronomical instruments, 14th century. The Almagest is a 2nd century mathematical and astronomical treatise on the apparent motions of the stars and planetary paths. Written in Greek by Claudius Ptolemy, a Roman era scholar of Egypt, it is one of the most influential scientific texts of all time, with its geocentric model accepted for more than twelve hundred years from its origin in Hellenistic Alexandria, in the medieval Byzantine and Islamic worlds, and in Western Europe through the Middle Ages and early Renaissance until Copernicus.


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