Most of the time, the planets appear to move eastward. However, the occasional apparent westward "drift" of the planets compared to the background stars is called ________.
A)Ptolemaic motion
B)occultation
C)precession
D)retrograde motion

Question

Quizplus · Accepted Answer

Retrograde motion is the occasional apparent westward "drift" of the planets compared to the background stars. It occurs when Earth, in its faster orbit, overtakes and passes by another planet.

Most of the Time, the Planets Appear to Move Eastward