This is a twenty-frame movie of the last twenty full moons. They are all at the same scale and centered appropriately so the change in size is "real" and so is the wobble. By "real," I mean that the moon is visually smaller (or larger) depending on the moon's distance from the earth, which varies a bit.
Y'know, Isaac Asimov hypothesized that if we didn't have such a large, bright moon that just happens to have the same angular size as the sun, we probably would have been really slow, as a species, to develop mathematics because we wouldn't have had an interest in all those complicated calendrical calculations related to great lunations and solar eclipses and such.
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