Sosigenes (Moon)

Named after Sosigenes - Greek astronomer, chronologist (unkn-fl. 46 B.C.).

Sosigenes is a lunar impact crater on the west edge of Mare Tranquillitatis. It lies to the east of the large walled plain Julius Caesar. The crater rim has a high albedo, making it bright. It has a small central rise at the midpoint of the floor. (wikipedia entry)

A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.