GoodSeeing
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Changleng

28.700° N   115.817° E  ·  38 M
54 /100
PEAK
Marginal, but there is a 1 hour gap from 03:00.
BEST WINDOW 03:00–04:00 · ASTRO DARK 00:00–05:00 · MOON 0%
Transparency
0.36
Seeing
1.00
Cloud
27%
Moon
0%

Fair tonight

Hour by hour, local to Changleng. 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
06
30
7
20
54
27
10
0
BEST WINDOW
Low cloud
19%
12%
3%
0%
10%
28%
10%
Mid cloud
56%
100%
81%
27%
59%
45%
22%
High cloud
0%
0%
0%
0%
2%
3%
2%
Transparency
0.36
0.35
0.33
0.29
0.10
0.24
0.23
Seeing
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Moon clear
down
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 Poor · 30/100
Starting from
100
Cloud
−59
Transparency
−10
Seeing
−0
Moonlight
−0
Darkness
−0
Score
30
CLOUD 64% LOW 19% MID 56% HIGH 0% SUN -46.0° MOON -44.8° / 0% WIND 1 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 54

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

00020406
CLOUD BREAKS 03:00CLOUD RETURNS 04:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 51

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

00020406
CLOUD BREAKS 03:00TWILIGHT BEGINS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 51

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

00020406
CLOUD BREAKS 03:00CLOUD RETURNS 04:00
SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 40

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

00020406
CLOUD BREAKS 03:00CLOUD RETURNS 04:00
SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 55

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

00020406
CLOUD BREAKS 03:00CLOUD RETURNS 04:00
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The next week of nights

Tonight · 12 Aug
54
Fair
MOON 0%
03:00–04:00
Tomorrow · 13 Aug
40
Fair
MOON 1%
04:00–05:00
Friday · 14 Aug
35
Fair
MOON 5%
02:00–03:00
Saturday · 15 Aug
17
Poor
MOON 10%
Sunday · 16 Aug
72
Good
MOON 19%
02:00–03:00
Monday · 17 Aug
43
Fair
MOON 28%
02:00–03:00
Tuesday · 18 Aug
49
Fair
MOON 37%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Changleng, 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 →