Doppler (Moon)

Named after Johann Christian Doppler - Austrian physicist, mathematician, astronomer (1803-1853).

To the east are the craters Das and Galois. The rim has a somewhat polygonal form, and a smaller crater is joined with the inner side of the northeast wall. The interior is rough and irregular, with some terracing of the worn outer walls, and a complex of central hills to the north of the midpoint. (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.