This ring mountain forms, with Langrenus, Vendelinus and Furnerius, a line of four similarly-sized craters (very roughly 150km across) centred on the 61°east line of longitude. Despite being an old crater, it is still clearly defined, with impressive central peaks.

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

Inconstant Moon