StarsOutAlert me on good nights
Should you go outside tonight?
Good night ahead
Mostly clear. Worth setting up.
Vienna
6.9
out of 10
Peak 2h
8.200:00–02:00
Prime 21–01
6.721:00–01:00
Best this week
9.4Sun, Sep 6
Moon
Last Quarter
55% lit
Bright moon — reduces deep sky visibility
🔭 Moon up: 21:56–15:14
📍 NE · 9°
Full moon: Sep 26
Sky now
Clear · 0%
Measured at LOWW · 18km away · 23min ago
Sun ↓ 19:32·Dark from 20:32·79% clouds
🔭
Moon visible today
06:16 – 11:50 · 55% lit · great for telescope viewing
Next great night
Friday — 9.0
✨ Great night tonight
Sky quality tonight
Best: 00:00–02:00This week’s nights
Europe/ViennaHow the score works
60% weight
Cloud cover
Layer-weighted across the best 2-hour window of the night. Low clouds block everything, thin high cirrus still lets bright stars through.
40% weight
Moon darkness
A new moon boosts the score. A full moon near midnight washes out all but the brightest stars. We ease the penalty after midnight when the moon is setting.