Oenopides (Moon)

Named after Of Chios Oenopides - Greek astronomer, geometrician (500(?)-430 B.C.).

Oenopides is a lunar crater that is located near the northwestern limb , and so appears foreshortened when viewed from the Earth. This formation lies due south of the prominent crater Pythagoras, and is attached to the southwest rim of Babbage E. The southwest rim is part of the northern edge of Oceanus Procellarum. To the south is Markov. This formation is an old crater that has been heavily eroded by subsequent impacts, leaving a low outer rim that is generally hilly and contains a few clefts. (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.