365 Days of the Moon -- August 24, 2014
Clavius, Porter, Rutherford, Blancanas
Today we will take a break from the terminator madness of the past few days and look at an old classic crater, Clavius. Back when I first
observed the Moon a time long ago when we didn't even know what the far side looked like), Clavius was considered the largest crater on the
visible side of the Moon. Spanning 136 miles and containing a number of sizable craters within it, Clavius is indeed huge. But today we
are a little more sophisticated in our view of the Moon and know that Bailly, along the southwestern limb not too far from Clavius, is
actually about 50 miles wider. The vast expanse of Clavius, formed in the Nectarian Epoch, is host to other younger craters. Porter,
from the Imbrian Epoch, lies on Clavius' northeast rim, while even younger Copernican Epoch Rutherford lies on the southeast rim.
Blancanas, another ancient Nectarian Epoch crater, lies to the lower left of Clavius. Both of these craters have been degraded and
filled with ejecta thrown from the impacts that created the great basins now hosting the Moon's dark maria.
Image taken through a Celestron 11 Edge HD, 2.5X Powermate, and Skyris
Image copyright Robert Reeves 2014
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