An animation showing how the Moon changes during a cycle of phases.
Created by superimposing daily images throughout one lunation,
the animation shows how the Moon gets bigger and smaller as it nears us and goes away from us,
and tilts (librates) north and south, as it moves above and below our Equator,
and tilts east and west, as its orbital motion speeds and slows.
(António Cidadão, apod991108)