Among other things, Alain tuvo wrote:

> Albedo is linear. A planet with an albedo of 0.50 reflect 50% (2/4) of
> the incident lignt, albedo 0.25 mean 25% (1/4) of incident light, albedo
> 0.75 = 3/4.

But it's not necessarily constant, is it?

A planet's albedo could be 0.25 with a certain amount of incident light, but 
maybe, with twice as much incident light, its albedo would be only 0.21 
(not talking about changes in the planet's surface, angle of incidence, 
etc.)

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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