StarsOut
Should you go outside tonight?
Good night ahead
Mostly clear. Worth setting up.
Heidelberg
7.5
out of 10
Cautious estimate
Models split — score biased toward the cloudier forecast.
Peak 2h
9.203:00–05:00
Prime 21–01
7.521:00–01:00
Best this week
8.8Sun, Jul 19
Moon
Waxing Crescent
11% lit
Moon doesn’t interfere — perfect darkness
🔭 Moon up: 09:24–23:02
Full moon: Jul 29
Sky now
Clear · 0%
Measured at EDFM · 14km away · 11min ago
Sun ↓ 21:24·Dark from 22:24·71% clouds
Alert me on good nightsSky quality tonight
Best: 03:00–05:00This week’s nights
Europe/BerlinHow 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.