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Langfang

39.521° N   116.715° E  ·  19 M
16 /100
PEAK
Nothing usable opens up tonight.
NO USABLE WINDOW · ASTRO DARK 00:00–04:00 · MOON 0%
Transparency
0.10
Seeing
1.00
Cloud
99%
Moon
0%

Poor tonight

Hour by hour, local to Langfang. 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
2
2
5
16
11
0
Low cloud
49%
72%
56%
11%
6%
3%
Mid cloud
98%
82%
66%
43%
52%
13%
High cloud
100%
100%
100%
96%
99%
92%
Transparency
0.10
0.10
0.10
0.10
0.10
0.19
Seeing
1.00
0.89
0.89
1.00
1.00
1.00
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 · 2/100
Starting from
100
Cloud
−97
Transparency
−1
Seeing
−0
Moonlight
−0
Darkness
−0
Score
2
CLOUD 100% LOW 49% MID 98% HIGH 100% SUN -35.3° MOON -34.1° / 0% WIND 2 TEMP 24°
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.

NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

000204
CLOUD NEVER DROPS BELOW 93%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

000204
CLOUD NEVER DROPS BELOW 93%
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 93%
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 93%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

000204
CLOUD NEVER DROPS BELOW 93%
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The next week of nights

Tonight · 12 Aug
16
Poor
MOON 0%
Tomorrow · 13 Aug
71
Good
MOON 1%
21:00–04:00
Friday · 14 Aug
80
Excellent
MOON 5%
21:00–03:00
Saturday · 15 Aug
68
Good
MOON 10%
02:00–03:00
Sunday · 16 Aug
68
Good
MOON 19%
02:00–03:00
Monday · 17 Aug
37
Fair
MOON 28%
02:00–03:00
Tuesday · 18 Aug
6
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for Langfang, 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 →