Among other things, Alain saw fit to write:

> Not in a tropical setting. In those areas, the twilight last only minutes,
> at most. The moon should be almost touching the horizon to have some
> twilight.

But it lasts minutes because the sun moves in an almost vertical direction,
so it gets farther from the horizon sooner... or so I understand.

What I mean is, whether you have twilight or not, would be determined by the
position of the sun (and full moon) with respect to the horizon, not by the
time it took to reach that position. So once you have a position in a
picture, it doesn't matter if it's in the tropics or in the poles (except
for the possible effects of temperature, moisture, dust...).

-- 
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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