StarsOutAlert me on good nights
Should you go outside tonight?
Might be worth a look
Partial clearing expected. Keep an eye out.
Tokyo
4.9
out of 10
Peak 2h
6.702:00–04:00
Prime 21–01
4.921:00–01:00
Best this week
7.2Wed, Sep 2
Moon
Waning Gibbous
91% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 19:05–08:02
Full moon: Sep 26
Sun ↓ 18:12·Dark from 19:12·37% clouds
🔭
Moon visible today
05:12 – 08:35 · 91% lit · great for telescope viewing
Next great night
Wednesday — 7.2
🌙 Good night ahead
Sky quality tonight
Best: 02:00–04:00This 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.