> I wonder how to get the shadow of the planet also extending across the 
> unlit side of the rings (whose ambient is 0.3, as in reality, some 
> sunlight is scattered through to the "lower" side)... should I try a 
> negative spotlight?

If you're using POV-Ray 3.7, try the diffuse backside illumination 
feature: Just add another float to the "diffuse" statement. This will 
have part of the illumination filter through to the other side 
(presuming that the rings are implemented as infinitely thin disks, 
otherwise you'd have to have radiosity enabled to make it work).

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