Cannon (Moon)

Named after Annie Jump Cannon - American astronomer (1863-1941).

Cannon is a lunar crater that is located near the east-northeastern limb 's near side. It lies just to the northwest of the Mare Marginis, and south-southeast of the crater Plutarch. Farther to the east-northeast is Hubble. This is a worn and eroded formation with an interior floor that has been resurfaced by lava. (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.