Crap I hate this forum software at times. Buggy as hell with Opera. Short version:
* Aurora Borealis to be more frequent during no moon, to help explain why we have much light. Only weather have a good chance of making truly dark nights.
* Bring back Holidays, connect them with constellations (birth signs), and introduce meteor showers at these times, radiating from these constellations.
* Meteor showers are usually non interesting, just a moving dot or a streak, your typical everynight shooting star.
* But a tiny tiny fraction of them (almost impossible to get) are truly spectacular, like these examples:
http://www.youtube.com/watch?v=s1amG4oW9Vg
http://www.youtube.com/watch?v=3dan3wM3rns
http://www.youtube.com/watch?v=uZDPviXbvkI (have seen something very similar, and yes, it really is this extreme).
http://www.youtube.com/watch?v=zZ1wsEEDmMw (possible heat source in cold nights? A source of rune stones? Explore to locate
)
But why stop at there? Have the occasional Halo effects as well. Easily a flare thing, except not camera driven.
Basic 22° Halo: http://www.youtube.com/watch?v=McWULs2VG14
Sun Dogs / Bi sun: http://www.youtube.com/watch?v=afm1aWuL8ww
Another one: http://www.youtube.com/watch?v=5W8dMCiqSKU
Technical info: http://www.youtube.com/watch?v=RxKlNa4gDOw