StarsOut
Should you go outside tonight?
Great night tonight
Clear skies and dark conditions. Go outside.
Mauna Kea
7.9
out of 10
Peak 2h
9.901:00–03:00
Prime 21–01
7.421:00–01:00
Best this week
9.0Sat, Jul 18
Moon
Waxing Crescent
5% lit
Moon doesn’t interfere — perfect darkness
🔭 Moon up: 08:20–21:18
📍 E · 33°
Full moon: Jul 29
Sun ↓ 19:04·Dark from 20:04·58% clouds
Alert me on good nightsSky quality tonight
Best: 01:00–03:00This week’s nights
Pacific/HonoluluHow 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.