oberon+blue

One last try. http://www.atoptics.co.uk

No idea how Utah Busines made it into my last comment. Hopefully this will pass the atmospheric optics site along.

There's a great website full of examples and explanations of various atmospheric optical phenomena.
Brocken spectre is there.

I discovered the site after a cross-country flight where I saw a shadow of our plane with a halo around it cast on the clouds below us -called a "glory."

The web site's at