How did Ptolemy explain the apparent retrograde motion of certain celestial bodies quizlet?

epicycles 1 How did the geocentric model explain the retrograde motion of the planets? 2 How did Ptolemy explain retrograde motion quizlet? 3 Which idea did Ptolemy model use to explain why the planets appear to move backwards as they moved in their orbits? 4 How did Ptolemy prove his theory? 5 How

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