Rynin (Moon)

Named after Nikolaj Alexsevitch Rynin - Soviet rocketry scientist (1877-1942).

Rynin is a lunar crater that is located just behind the northwestern limb, on the far side. It is located just to the east of the larger crater Stefan, and to the southwest of Chapman. This is an older lunar crater with an outer rim that has been worn and rounded due to impact erosion. The edge remains well-defined around most of the perimeter, but it is overlain by several smaller craters. (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.