SR-03-Ptolemy-1 - Almagest (Latinized from the Arabic for...

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Ptolemaic Astronomy Eratosthenes of Alexandria (275–194 BC) estimated size of Earth using shadows. Aristarchus of Samos (310–230 BC) — suggested Earth circles Sun. But overwhelming consensus held that Earth is stationary at center of universe. Astronomers sought system of circles to account for retrograde motion of planets. Ptolemy gave a full treatment of the epicycle theory in his Syntaxis , later known as the
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Unformatted text preview: Almagest (Latinized from the Arabic for the greatest), c. AD 150. Ptolemy used epicycles, eccentrics, and the equant . Eudoxus (c. 410350 BC): devised system of nested spheres; adopted by Aristotle. But most astronomers preferred geocentric/geostatic epicycle system: Hipparchus (c. 190120 BC) Claudius Ptolemy of Alexandria (c. AD 100160) equant point Earth A C D B Ptolemy's equant center...
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