Thanks everyone for your replies. After considering your posts and a lot of further pondering, I think I understand what I was missing.
From the perspective of the planet, it is standing still while the moon is revolving around it. From the moon's point of view, it is still while the planet...
When a moon orbits around a planet, its centripetal force is balanced against the gravity of the planet, keeping it in a stable orbit. If all motion is relative, then the moon in perfect orbit could be said to be standing still while the planet rotates under it. The major difference I see is...