libration

This animation, covering a full lunation, dramatically illustrates libration of latitude and of longitude. Notice also how much the Moon's apparent size changes from perigee (its closest approach to the Earth) to apogee (when it is at its furthest).

Libration

Photo: António Cidadão. His Home Page of Astrophotography includes stereograms, animations, and "Seven Craters a Week" from his forthcoming photographic lunar atlas.

Inconstant Moon