Question

Which idea did Ptolemy’s model use to explain why the planets appeared to move backward as they moved in their orbits?

Answer 1

Explanation:

He argued that planets move on two sets of circles, a deferent and an epicycle. This explained retrograde motion while keeping the planets in their circular orbits around the Earth. Where this did not fit, Ptolemy proposed an eccentric.

Answer 2

Answer:

its C

Explanation:

cause mhm