the first gif shows one full year of full moons between may 2005 and april 2006. its size at perigee (when nearest to us) and apogee (farthest from us) differs by more than 10%. the wobble, due to the moon’s elliptical orbit and slight axial tilt and inclination, is know as lunar libration. (this is not to be confused with lunar libation, which is fancy speak for moonshine.) the second gif shows the moon’s phase and libration during october of 2007.
okay, that’s pretty neat. You can describe things, but seeing them happen is more effective, to me at least.