StarsOutAlert me on good nights
Should you go outside tonight?
Great night tonight
Clear skies and dark conditions. Go outside.
Vienna
8.6
out of 10
Peak 2h
9.200:00–02:00
Prime 21–01
8.621:00–01:00
Best this week
7.5Sun, Jun 7
Moon
Waning Gibbous
70% lit
Bright moon — reduces deep sky visibility
🔭 Moon up: 00:36–10:20
Full moon: Jun 29
Sun ↓ 20:50·Dark from 21:50·1% clouds
🔭
Moon visible today
04:55 – 10:41 · 70% lit · great for telescope viewing
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.