Apollonius is a lunar crater located near the eastern limb of the Moon. It lies in the region of uplands to the west of Mare Undarum and northeast of the Sinus Successus on the Mare Fecunditatis. It is southwest of the crater Firmicus, and north of Condon crater.
The outer rim of Apollonius is somewhat worn and is overlaid by a pair of small craters (including 'Apollonius E') across the western wall. The nearly flat interior floor has a low albedo and has been covered by lava. It lacks a central peak or notable small craters across the bottom.
By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Apollonius crater.
The following craters have been renamed by the IAU.
Apollonius C See Ameghino crater.
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