first off: http://www.bsmooth.de/BSolutions/#SetSunMoon second: put a square parallel light facing the windows and mkae it big enough so that it covers them all. Make it low intensity and give it a pretty good ranged falloff so it's more than the usual) and make the edges a bit soft. Make it infinite, and volume visible with a light gold color. Next, turn on volumetric world in the skylab, and give it a low quality (around 10) and a medium density (around 20)