Stadius Moon crater

Stadius is a very old crater located near erathostenes and copernic. His walls have collapsed and the inner crater is filled with little volcano crater from 2kms to 400 meters wich make it barely observable. It is often used to measure the separation power of a telescope.

The old file is deleted. the new one is far better and comes from the JPL Caltech site called " Moontrek".