Dirichlet (Moon)

Named after Peter Gustav Lejeune Dirichlet - German mathematician (1805-1859).

Dirichlet is a lunar impact crater that is located. It is attached to the southern outer rim of the crater Henry. To the south-southeast is the much larger crater Tsander. This is a circular crater with a sharp-edged rim that is not significantly worn. (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.