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© Sierra College Astronomy Department

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Claudius Ptolemy is credited for devising the first predictive model of the universe, the Ptolemaic model (A.D. 150)

Discredited Aristarchus’s Sun-centered model with incorrect assumptions

Philosophical keys: use circles, have uniform circular motion

The Sun, Moon and each planet moved upon an epicycle, the center of which revolved around a deferent circle

Compound circular motion allowed planets to have retrograde motion

Ancient Astronomy Claudius Ptolemy (127-151 AD)

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