[Brian W (Brian)]

Hi all, this may be more of an observing question than a science question but here goes;

last night there was a huge ring around the moon. Not a moon-bow with pale colours just a very discernible cloud ring within the stratus(?) cloud.

Now moon-bows come from ice crystals (or so I believe ) but this was just a large thick ring.

Just wondering what causes such a thing?

Brian