For some reason, i do think that the way of the sun is
calculable
It's just the time of day, time of year, and the point of view, that needs to be considered to locate the actual position of the sun.
Now seriously; if you don't have a totally random based mission
setup, it shouldn't be that hard to point your camera onto the
sun - even if it's for a 10-min boring "look there's the sun" video
;D
~S~ CD