StarsOut
Should you go outside tonight?
Drop everything — go outside
Near-perfect conditions. Nights like this are rare.
Xi'an
9.6
out of 10
Clouds
7%
Moon
New Moon
1% lit
Moon below horizon — perfect darkness
Best window
23:00 – 01:00
Sun ↓ 19:16·Dark from 20:16
Alert me on good nightsSky quality tonight
Best: 23:00–01:00This week’s nights
Asia/ShanghaiHow 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.