Babcock is a lunar crater on the far side. It lies on the northeastern edge of Mare Smythii, to the southeast of Mare Marginis. To the south is the crater Purkynĕ, and to the east-northeast lies Erro. Babcock is located in a region 's surface that is occasionally brought into view during favorable librations, although it is seen from the edge and so little detail can be discerned from an observer on the Earth. (wikipedia entry)