Nassau (Moon)

Named after Jason John Nassau - American astronomer (1892-1965).

Nassau is a lunar impact crater. It abuts against the northeastern rim of the figure-8-shaped crater Van de Graaff. To the southeast lies the crater Leeuwenhoek, and to the east is Orlov. Nassau has a somewhat eroded crater rim, with small craters lying across the edge along the eastern, northwestern and southwestern sides. (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.