Definitions for "Arzachel"
Arzachel is a relatively young lunar impact crater located in the highlands in the south-central part of the visible Moon, close to the zero meridian (the visible center of the moon). It lies to the south of Alphonsus crater, and together with Ptolemaeus crater further north the three form a prominent line of craters to the east of Mare Nubium. The smaller Alpetragius crater lies to the northwest, and Thebit crater is to the southwest along the edge of the mare.