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Cosmo Novice
Feb3-12, 04:28 AM
P: 366
Quote Quote by D H View Post
This leads to a devil's advocate question: Does the Moon orbit the Earth or the Sun? Since the curvature is always sunward (this is not the case for a vehicle in low Earth orbit) and the gravitational force exerted by the Sun on the Moon is more than twice that exerted by the Earth on the Moon, why do we say that the Moon orbits the Earth?
We could take it even further and argue that actually the moon orbits the galactic centre as it rotates on the spiral arm! I dont know how far we could take these orbital frames but ultimately they are all orbits.

So the moon does orbit the erath, but it also orbits the sun and the galactic centre. This is all quite interesting!