Retrograde motion of a planet refers to which motion, when viewed from Earth?
A) setting of the planet in the west to any observer, caused by Earth rotation
B) eastward apparent motion with respect to the stars
C) southward motion of the planet as it moves away from the northern sky
D) westward apparent motion with respect to the stars

Question

Quizplus · Accepted Answer

Retrograde motion is the apparent westward motion of a planet against the background stars as observed from Earth. This occurs due to the relative positions and movements of Earth and the planet in their orbits around the Sun.

Retrograde Motion of a Planet Refers to Which Motion, When