> texture
> {
> gradient z
> texture_map
> {
> [0 T_Earth_Day]
> [0.45 T_Earth_Day]
> [0.55 T_Earth_Night]
> [1 T_Earth_Night]
> }
> scale 2
> translate <0, 0, -1>
> }

Note that this also scales & translates the individual textures in the 
map; you'd need to do something like:

   texture
   {
     gradient z
     texture_map
     {
       [0.45 T_Earth_Day   translate z*1 scale 0.5]
       [0.55 T_Earth_Night translate z*1 scale 0.5]
     }
     scale 2
     translate z*-1
   }

(Also note that I removed the texture map entries for 0 and 1, as 
they're not needed if they're identical to their respective "neighbor" 
entries.)

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