StarsOut
Should you go outside tonight?
Good night ahead
Mostly clear. Worth setting up.
Tucson
7.3
out of 10
Peak 2h
8.602:00–04:00
Prime 21–01
7.121:00–01:00
Best this week
9.6Fri, Jul 17
Moon
Waxing Crescent
2% lit
Moon doesn’t interfere — perfect darkness
🔭 Moon up: 07:59–21:27
Full moon: Jul 29
Sky now
Mostly cloudy · 75%
Measured at KDMA · 10km away · 45min ago
Sun ↓ 19:31·Dark from 20:31·92% clouds
Alert me on good nightsSky quality tonight
Best: 02:00–04:00This week’s nights
America/PhoenixHow 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.