Multiple Choice
How did the Ptolemaic model explain the apparent retrograde motion of the planets?
A) It held that sometimes the planets moved backward along their circular orbits.
B) It placed the Sun at the center so that the planets' apparent retrograde motion was seen as Earth passed each one in its orbit.
C) It varied the motion of the celestial sphere so that it sometimes moved backward.
D) It held that the planets moved along small circles that moved on larger circles around the Sun.
E) It held that the planets moved along small circles that moved on larger circles,also known as epicycles,around Earth.
Correct Answer:

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Correct Answer:
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