The terrain around this highly conspicuous class 1 crater is geologically very varied and interesting. In 1962 it became the first area of the Moon to be mapped by the US Geological Survey.

It is shown here under high illumination, when its ray system can be seen at its best.

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

Inconstant Moon