An apparent westward motion of a planet in the sky compared to the background stars (as viewed from the Earth)when observed on successive nights is referred to as
A) epicycle
B) retrograde motion
C) prograde motion
D) heliocentric motion
E) deferent

Question

Quizplus · Accepted Answer

Retrograde motion is the apparent westward motion of a planet in the sky compared to the background stars (as viewed from the Earth) when observed on successive nights.

An Apparent Westward Motion of a Planet in the Sky