Is it possible to completely see the edge of a half moon at night? Some days ago, about 1 ~ 1.5 hours after the sunset I could see a very bright half moon, and the interesting part is, I think I could see the edge of the dark half of the moon, i.e. a whole circle, but with very little contrast to the surrounding black space. It was very weak.
I'll use my impressive graphic design skills to try to explain it better:

The line I'm talking about is that grey one on the left, closing the moon.
My hypotheses are:

My brain made it up, as if it was trying to &quot;close the circle&quot;
The earth was lighting the moon up, as in: light from the sun was hitting the earth and being re-emitted to the moon (as a very bright moon can actually provide you enough light to see in the dark).

Thanks!
As uhoh has written in the comments, this phenomenon is known as &quot;planetshine&quot;, and in this case more specifically &quot;earthshine&quot;. The sunlight hits the earth and is reflected to the moon, illuminating what cannot be directly reached by the sunlight.

https://en.wikipedia.org/wiki/Planetshine
https://en.wikipedia.org/wiki/Earthlight_(astronomy)