StarsOutAlert me on good nights
Should you go outside tonight?
Probably not tonight
Too much cloud cover for a good session.
Osaka
3.7
out of 10
Peak 2h
5.200:00–02:00
Prime 21–01
3.921:00–01:00
Best this week
8.8Sun, Jun 7
Moon
Waning Gibbous
98% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 20:13–05:39
Sun ↓ 19:05·Dark from 20:05·82% clouds
🔭
Moon visible today
04:45 – 07:26 · 98% lit · great for telescope viewing
Next great night
Saturday — 7.8
✨ 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.