On a whim I imaged the Moon July 18, 2018 with my Explore Scientfic AR127 scope using a Canon T3i. I didn't think much about it until I thought I would take an over-exposed image to reveal the "Earthshine" (light from the Sun, reflected by the Earth on the Moon, which is then reflected back to the Earth).
That's when I saw a kind of weird feature near the top of the Moon in the image.
It appeared to be a "ring of beads"!
Here is a cropped image of the normal exposure:
And this is a cropped view of the over-exposed Moon:
What this is showing is that the rim around this particular large crater was having the sunlight hit just the tops of the rim where there are taller peaks to catch the light, while the floor of the crater is still in shadow! Cool!
I am not sure but it might be the crater called "Goldschmidt"
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