• Don SpainEmail author
Part of the Astronomer's Pocket Field Guide book series (ASTROPOC)


Clavius (136 miles) is a very impressive lunar giant. Because of its huge size and great blocky walls it is impossible to miss 1 day after first quarter. The walls must be at least 2 miles about the vast flat floor. In addition to the two large craters, Porter on the northeastern rim and Rutherfurd on the southeast, the floor is strewn with dozens of small craters. There is a series of good size craters that run through the center of the floor in and east-west direction. Five of this line of craters are easily visible in my 2.4 inch refractor. There is a grouping of small hills near the center of these craters that are easy to see in the 4 inch refractor. Look for other lines and crater chains on the floor. This is a visually beautiful formation that you must show off to anyone who visits your eyepiece.

Rutherfurd (32 miles) is about 1½ mile deep and abuts the southeastern wall of Clavius. There is a prominent off center peak rising from the rough and hilly floor. An impressive crater in its own right, it is overpowered by Clavius.

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Louisville Astronomical SocietyLouisvilleUSA

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