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Yanghang

31.370° N   121.437° E  ·  4 M
34 /100
PEAK
Nothing usable opens up tonight.
NO USABLE WINDOW · ASTRO DARK 00:00–04:00 · MOON 0%
Transparency
0.28
Seeing
0.68
Cloud
50%
Moon
0%

Poor tonight

Hour by hour, local to Yanghang. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
00
01
02
03
04
05
6
6
20
34
20
0
Low cloud
19%
14%
20%
25%
8%
10%
Mid cloud
98%
98%
67%
33%
66%
56%
High cloud
2%
10%
1%
2%
6%
23%
Transparency
0.26
0.27
0.27
0.28
0.28
0.28
Seeing
0.68
0.64
0.67
0.66
0.68
0.62
Moon clear
down
down
down
down
down
down
Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Why this hour scored what it did
00 Clouded out · 6/100
Starting from
100
Cloud
−90
Transparency
−3
Seeing
−1
Moonlight
−0
Darkness
−0
Score
6
CLOUD 98% LOW 19% MID 98% HIGH 2% SUN -43.7° MOON -42.5° / 0% WIND 5 TEMP 26°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

What are you doing tonight?

The same forecast, weighted for the target. Planetary work barely cares about moonlight; long exposures die on high cloud a visual observer would never notice.

SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 36

Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.

000204
CLOUD BREAKS 03:00CLOUD RETURNS 04:00
SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 38

Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.

000204
CLOUD BREAKS 03:00CLOUD RETURNS 04:00MOONLIGHT IGNORED FOR THIS TARGET
NO USABLE WINDOW FOR THIS TARGET TONIGHT

Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.

000204
CLOUD NEVER DROPS BELOW 50%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.

000204
CLOUD NEVER DROPS BELOW 50%
SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 35

Naked eye, whole sky. Total cloud and moonlight are the only things that count.

000204
CLOUD BREAKS 03:00CLOUD RETURNS 04:00
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The next week of nights

Tonight · 12 Aug
34
Poor
MOON 0%
Tomorrow · 13 Aug
23
Poor
MOON 1%
Friday · 14 Aug
23
Poor
MOON 5%
Saturday · 15 Aug
67
Good
MOON 10%
02:00–03:00
Sunday · 16 Aug
68
Good
MOON 19%
02:00–03:00
Monday · 17 Aug
62
Good
MOON 28%
20:00–21:00
Tuesday · 18 Aug
31
Poor
MOON 37%
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Nearby locations

About this forecast

Conditions for Yanghang, China are computed from the MET Norway forecast model for these exact coordinates, combined with sun and moon positions we calculate directly. The score weighs cloud cover by layer, atmospheric transparency, estimated seeing, moonlight and how dark the sky actually gets. Read the full method →