i have heard them called both moon and sun roofs..

i haven't figured out the difference, but my car manual refers to it as a moon roof..

i can shut it and cover it up (inside the car) so it looks like a solid ceiling..

i can tilt it up (with the ceiling panel in place, and have it vent, with out any light coming in) i can tilt it up with the ceiling panel slid out of the way (and have a glass roof, tilted open, or i can open it... and have a big hole in the ceiling.. (all with the touch of a button or two..)