What I don't understand is why people who want to simulate sunlight want
to locate their light source at 150 millions of kilometers while their scene
is some meters wide. Putting the light source at 1 km away will make no
visible difference but it will be a lot more accurate.

  There's no point in putting the light source at 150 millions of km away
anyways. It will not simulate the real sunlight even at that distance. To
really simulate it you would have to take into account the refraction of
the light when it enters and travels inside the atmosphere (it varies depending
on the temperature of the air at different altitudes) plus the scattering
of the light when it hits air molecules, clouds, etc.
  So putting the light at 1km will not make your scene any worse. In some
cases it might even make it look better.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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