Attached Link: http://perso.libertysurf.fr/x-taris/xtym/page1.htm

Hello, I add a tip to sun in vue : you can obtain some "lens" circles in the sky using a standard atmosphere (see it in "unusual" category ? I've the french version, I'm not sure of the name) See it in the picture and the screen shot of sky and clouds menu. Bye, Xav