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