OK. I've been a nerd for a while and seen all sorts of cool astronomy pictures, but this one made me say WOW.
This is an image sequence that shows how minor wobbles in the Earth/Moon system allow viewers on Earth to see about 59% of the Moon's surface, despite the fact that the moon is synchronously locked in orbit about the Earth. Which is to say, we SHOULD only be able to see exactly 50% of the Moon's surface, but in fact there are wobbles that allow us to "see around the corner".
Better explanation here.
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