StarsOutAlert me on good nights
Should you go outside tonight?
Might be worth a look
Partial clearing expected. Keep an eye out.
Sapporo
5.3
out of 10
Peak 2h
6.700:00–02:00
Prime 21–01
5.321:00–01:00
Best this week
8.5Sun, Sep 6
Moon
Waning Gibbous
84% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 19:15–09:14
Full moon: Sep 26
Sun ↓ 18:12·Dark from 19:12·97% clouds
🔭
Moon visible today
04:58 – 09:24 · 84% lit · great for telescope viewing
Next great night
Saturday — 8.2
✨ Great night tonight
Sky quality tonight
Best: 00:00–02:00This week’s nights
Asia/TokyoHow 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.