Assume you lived on the moon and noticed the Earth high in the sky. From that location, how often would the Earth set below your horizon?
A) every 24 hours
B) once a sidereal period (27.3 days)
C) once a synodic period (29.5 days)
D) every year
E) never

Question

Quizplus · Accepted Answer

The Earth would never set below the horizon if you were on the Moon because the same side of the Moon always faces the Earth due to synchronous rotation.

Assume You Lived on the Moon and Noticed the Earth