Geological Chronicle
Lagrange is a lunar impact crater spanning 162.21 kilometers in diameter near the southwestern limb of the Moon, where foreshortening gives it an oblong appearance. Attached to the northwestern rim of the crater Piazzi, it lies southeast of Montes Cordillera, the ring-shaped mountain range surrounding the immense Mare Orientale impact basin.
The southwestern half of the walled plain was heavily damaged by a mass of ejecta from Mare Orientale, which produced irregular surface striations radial to the basin. That bombardment reduced the southwestern section to an uneven depression covered in long ridges and gouges, with the small bowl-shaped crater Lagrange D marking its most notable feature.
Only the northeast part of the crater remains somewhat intact, exhibiting a worn rim of low ridges and a relatively level floor that retains traces of basin debris. The feature is named for Italian mathematician Joseph Louis Lagrange, and its satellite system includes Lagrange T, a concentric, double-walled crater.