Sylvester (Moon)

Named after James Joseph Sylvester - British mathematician (1814-1897).

Sylvester is a lunar impact crater that is located near the north pole , along the northern limb in the libration zone. It lies just to the south-southeast of the craters Grignard and Hermite; the latter of which is within one crater diameter of the pole. South is Pascal. Due to its location, Sylvester receives sunlight at only a low angle. (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.