StarsOut
Should you go outside tonight?
Great night tonight
Clear skies and dark conditions. Go outside.
Jeju
8.6
out of 10
Peak 2h
8.720:00–22:00
Prime 21–01
8.721:00–01:00
Best this week
8.8Fri, Jul 17
Moon
Waxing Crescent
5% lit
Moon doesn’t interfere — perfect darkness
🔭 Moon up: 07:20–21:17
📍 SE · 71°
Full moon: Jul 29
Sun ↓ 19:44·Dark from 20:44·64% clouds
Alert me on good nightsSky quality tonight
Best: 20:00–22:00This week’s nights
Asia/SeoulHow 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.