I usually set the 'photo-realitic' button to about 96%. I then set my 'real atmosphere' at 100%, import a custom solar system so that all of the shadows from the planets cast proper shadows via the authinic sun at the center of the system. The I set the planetational orbits to default and select the time zone that I will be working in. I usually leave the engine running for a while so that I can let the factories in the city next to mine add a little pollution to the air for added realism. Then just click 'Render' Hehe