Römer (Moon)

Named after Ole Römer - Danish astronomer (1644-1710).

Römer is a lunar impact crater that is located to the north of the Sinus Amoris in the northeast section. It lies in the southwestern part of the mountainous region named the Montes Taurus. To the west-northwest is the crater-bay Le Monnier, on the eastern edge of Mare Serenitatis. The rim has high walls with a terraced inner surface. (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.