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Changji

44.008° N   87.305° E  ·  581 M
70 /100
PEAK
Worth setting up — 2 hours of workable sky from 02:00.
BEST WINDOW 02:00–04:00 · ASTRO DARK 22:00–04:00 · MOON 0%
Transparency
1.00
Seeing
1.00
Cloud
6%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
22
23
00
01
02
03
04
05
12
11
10
18
70
68
46
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
98%
98%
99%
90%
30%
27%
4%
2%
High cloud
6%
4%
4%
2%
1%
10%
2%
0%
Transparency
1.00
1.00
0.99
0.99
0.98
0.92
0.88
0.84
Seeing
0.99
1.00
0.97
0.88
0.89
0.92
0.93
0.94
Moon clear
down
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
22 Clouded out · 12/100
Starting from
100
Cloud
−88
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−0
Score
12
CLOUD 98% LOW 0% MID 98% HIGH 6% SUN -23.3° MOON -22.0° / 0% WIND 2 TEMP 29°
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 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 70

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

22000204
CLOUD BREAKS 02:00TWILIGHT BEGINS 04:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 70

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

22000204
CLOUD BREAKS 02:00TWILIGHT BEGINS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 60

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

22000204
CLOUD BREAKS 02:00TWILIGHT BEGINS 05:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 52

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

22000204
CLOUD BREAKS 02:00TWILIGHT BEGINS 05:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 56

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

22000204
CLOUD BREAKS 02:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
70
Good
MOON 0%
02:00–04:00
Tomorrow · 13 Aug
80
Excellent
MOON 2%
00:00–04:00
Friday · 14 Aug
92
Excellent
MOON 6%
21:00–04:00
Saturday · 15 Aug
80
Excellent
MOON 12%
00:00–01:00
Sunday · 16 Aug
96
Excellent
MOON 19%
00:00–01:00
Monday · 17 Aug
90
Excellent
MOON 28%
00:00–01:00
Tuesday · 18 Aug
9
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for Changji, 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 →