posted on Mar, 21 2011 @ 06:10 AM
The moon's day is the exact same as it's orbital period around earth, in a cosmic sense it's year (around earth), which is slightly over 27 earth
days. All of the moon sees the sun, how else would you explain a crescent moon in the sky?
The planet Mercury has a day about 2/3 the length of its year, I'm not looking up the exact numbers but a day on Mercury is around 58 earth days and
its year, the length of earth days it takes to orbit the sun is around 88 earth days. We observe gas giants around distant stars with very close and
fast orbits around their stars to also be tidally locked, meaning their day is the same as their year, only one side sees their sun. Imagine the
weather on such a place.