How Did the Ptolemaic Model Explain the Apparent Retrograde Motion

question 30

Multiple Choice

How did the Ptolemaic model explain the apparent retrograde motion of the planets?

• A)The planets moved along small circles that moved on larger circles around Earth.
• B)The planets sometimes stopped moving and then reversed to move backward along their circular orbits.
• C)The model showed that apparent retrograde motion occurs as Earth passes by another planet in its orbit of the Sun.
• D)The planets resided on giant spheres that sometimes turned clockwise and sometimes turned counterclockwise.

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