Retrograde motion of a planet when viewed from Earth is caused by the fact that the
A) planet's orbit is inclined at an angle to Earth's orbit.
B) planet's orbit is elliptical.
C) Sun is moving.
D) Earth is moving.

Question

Quizplus · Accepted Answer

Retrograde motion is observed when Earth, moving faster in its orbit, overtakes another planet. This makes the other planet appear to move backward in the sky from our perspective.

Retrograde Motion of a Planet When Viewed from Earth Is