example in http://an.org/programming/multivideo/sunset5.blend
FirstAndLast:SunSet -- Wed, 07 Dec 2005 19:05:17 +0200 reply
has more examples, like a MidnightSun? render -- Mon, 05 Dec 2005 19:45:33 +0200 reply
http://www.deviantart.com/view/23683152/
all seasons in one --antont, Fri, 08 May 2009 05:06:49 +0300 reply
http://alexiuss.deviantart.com/art/Seasonscape-69489448