Hitchhiker's Guide to Rukl Chart 12

[Thierry Legault's view of Archimedes/Aristillus/Autolycus] Thierry Legault's CCD image of Archimedes (right), Aristillus (bottom left) and Autolycus (center left).
Autolycus (JRF <freeman _at_ netcom.com>)
This prominent trio of craters are "landmark" features, easily recognized and useful for orientation. Note how different they appear: Archimedes is flooded, with terraced walls. Aristillus has a central peak and a much fresher appearance. Autolycus has no peak. Also see Rukl chart 22, for further text on Archimedes.
Mt. Blanc / Alpine Valley Sunrise Ray (Larry B Smith <KTBNDRY _at_ paonline.com>)
August 18, 1999: I was observing the lunar terminator at 20:25 EST and observed what I believe was a sunrise ray to the southeast of the Alps Valley. The ray originated from the western face of the Alps Mountains just to northwest of Mt. Blanc (approx. 46.5 deg. north latitude and 0.5 deg. west longitude). The ray extended approximately 50 km northwesterly from the mountains out onto Mare Imbrium. Initially, I thought there was a mountain ridge that was catching the early morning sunlight, but after looking closely at Rukl's "Atlas of the Moon" (chart 12) it was obvious that this area is reasonably flat (there's no wrinkle ridge near this area).
I was using my 12.5-inch Dobsonian at 200X.
Cassini (JRF <freeman _at_ netcom.com>)
This rather odd-looking flooded crater is hard to mistake for anything else on the Moon, due to its two prominent interior craterlets.
Cassini (David North <d _at_ timocharis.com>)
Cassini looks almost comical to me for some reason -- the proportions are so odd. But a few moment's contemplation will yield easy views of the two nearly obliterated central peaks that add a poignance, and the odd, fat, short rilles to the east of the encroaching central crater.
Moon Sheep (JRF <freeman _at_ netcom.com>)
Note Piton and the Spitzbergen Mountains (Montes Spitzbergensis), and see the text for Rukl chart 11.

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This page last modified: Dec 06, 2020
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