and the answer is..... that nothing in the vue universe matches up with anything else. :) this is going from the top view and assigning north to the top of the screen. 90 degrees puts the sun due north, but to get the light to point from that diretion, you set the roll to 0. if you want the camera to point north, that's 180. (well, okay, the light pointing TO the north(as opposed to coming FROM the north) matches the camera compass.) the azimuth and declination are also liked to the sun light, so if you change the numbers in the sun box, or move the light around, each affects the other.