This large walled plain has a very distinctive coloured floor - light in the centre and dark in the lower northern and southern ends.

It is seen here at around day twelve of the lunation, just after the morning terminator has passed it.

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

Inconstant Moon