One moon in this plane, but other moons are visible. 

The school is in the material (normal) plane, but the skies above it show other planes at night. 

As for astronomical quirks, I already mentioned a few (weird stars), and some interesting things can be seen at night at times. Feel free to throw some stuff in. Easily visible constellations, maybe? Large, bright galaxies which only appear on certain nights? Comets which don't act like real comets? A very large moon that is actually shaped like a Crescent and not just mostly hidden by shadow on a certain night? Feel free to contribute.

And yes, you are accepted. All of you are in. You can also play as a non-student if you want.