Circular Rainbow

I just happened to look at the sky yesterday and saw a complete circular rainbow around the sun!  It was the coolest thing!  I ran inside to get my camera but could not get a picture of the entire circle because the sun was so high and so bright, my camera couldn't focus.  So I got as much of it as I could, and luckily you can still tell it is more circular than just an arc like the typical rainbow.

Feast your eyes on this beauty: