The "Rukl" numbers refer to charts in
Antonin Rukl's Atlas of the Moon, widely acclaimed by lunar observers as the best lunar atlas for the telescopic observer. Long out of print, the
second edition has been recently
reissued by Sky Publishing. The "L" numbers refer to the feature's position in the Lunar 100, where applicable. The Lunar 100 is an observing list covering the 100 most significant features on the Moon, ordered by difficulty.
Rukl 51. L 44. Crater near the western shore of Mare Humorum.
Copyright © 2003-2007 Michael Portuesi.
See the front page for licensing information.
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