Btw, it's a common misconception that light rays coming from the Sun are
parallel.

  Actually the Sun is an area light. Its size is significant and thus the
rays coming from it are not parallel. Light rays coming from opposite sides
of the Sun disk hit a point in the Earth at different angles.

  Thinking about it, there should not be big difference between a circular
light source with the radius of the Sun at a distance of the Sun from the
Earth, and a circular light source at 1km of distance and respectively
smaller radius (so that its apparent size is the same), given that our
scene is some meters wide.

-- 
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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