Kästner (Moon)

Named after Abraham Gotthelf Kästner - German mathematician, physicist (1719-1800).

Kästner is a lunar crater that is located near the eastern limb , to the southwest of the Mare Smythii. Just to the northwest is the walled plain Gilbert. To the south is the prominent crater Ansgarius, and to the southwest lies La Pérouse. This formation belongs to the category termed a walled plain. (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.