The effect of this spell is vaguely reminiscent of being inside a planetarium, but usually far better done. Getting the stars right requires a roll vs. Astronomy instead of IQ or the use of Eidetic Memory and many, many hours spent star-gazing.

Illusion [65] 
    Area Effect (8 yard radius) [+100%] 
        Builds on built-in 2 yard radius 
    Persistent [+40%] 
    Independence [+40%] 
    Extended Duration (x300) [+100%] 
    Visual Only [-30%] 
    Only to Create Illusion of Being Outdoors on a Starlit Night [-60%] 
        Moon(s) and planetary rotation optional 
    Magical [-10%] 
    Spell Components [-20%] 
        Must say "star light" in Latin 
        Must gesture with hands 
Levels 2-8 [78/90/103/115/128/140/153] 
    Increase Area Effect by 1 step [+50%]