Named after Anders Celsius - Swedish astronomer (1701-1744).
Celsius is a small lunar crater that is located in the rugged terrain in the southern hemisphere 's near side. It lies less than one crater diameter to the south-southwest of the crater Zagut, and due north of Büsching. This is a heavily worn crater with a southwest rim that has been damaged by multiple small crater impacts. There is a valley-like gap in the northern rim that joins Celsius with Celsius A. (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.