Perfectly round shape on the moon.

I just took this photo. Although the picture is pretty mundane, I observed something I have never seen before: The perfectly round circle on the bottom of the moon (bottom right hand corner).

At first I thought it was a crater, but it looks too perfect. What could it be?

What are the shiny dots all over the moon?

www.google.com/moon

A view with Tycho centered is:

http://www.google.com/moon/#lat=-43.802818&lon=-14.16687...