Geological Chronicle
Rima Calippus is a lunar graben structure spanning 40 kilometers in length across the lunar basalt crust. Formed by structural faulting and crustal extension, the trench cuts through terrain within the Eudoxus quadrangle (LAC-26).
Officially cataloged by the International Astronomical Union at selenographic coordinates 37.0316° latitude and 12.6597° longitude, the rille designation notes: Named from nearby crater.