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Interestingly, the moon's tidal lock is not perfect, resulting in a wobble that can be seen in time lapses: http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=4236

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I used to work in the SVS and Ernie, who made those images, got to be a real expert on the complexities of the moon's orbit. He did some really great work. Check out the SVS website for more.

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