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Lhünzhub

29.893° N   91.262° E  ·  3775 M
51 /100
PEAK
Marginal, but there is a 2 hours gap from 04:00.
BEST WINDOW 04:00–06:00 · ASTRO DARK 02:00–06:00 · MOON 0%
Transparency
0.36
Seeing
1.00
Cloud
33%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
02
03
04
05
06
07
27
20
51
49
23
0
BEST WINDOW
Low cloud
2%
4%
6%
5%
9%
20%
Mid cloud
46%
48%
24%
12%
24%
30%
High cloud
63%
78%
9%
41%
94%
96%
Transparency
0.31
0.10
0.35
0.36
0.35
0.34
Seeing
1.00
1.00
1.00
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
02 Poor · 27/100
Starting from
100
Cloud
−63
Transparency
−10
Seeing
−0
Moonlight
−0
Darkness
−0
Score
27
CLOUD 76% LOW 2% MID 46% HIGH 63% SUN -45.2° MOON -44.4° / 0% WIND 2 TEMP 13°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.
Tonight's limiting factor
Why thin high cloud ruins long exposures

Cirrus you can barely see will halo your bright stars, lift your background and vary between frames. Visual observers shrug it off. Long exposures integrate it, so it accumulates.

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 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 49

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

020406
HIGH CLOUD CLEARS 04:00CLOUD RETURNS 06:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 59

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

020406
HIGH CLOUD CLEARS 04:00CLOUD RETURNS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 44

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

020406
HIGH CLOUD CLEARS 04:00CLOUD RETURNS 06:00
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 36

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

020406
HIGH CLOUD CLEARS 04:00CLOUD RETURNS 05:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 48

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

020406
HIGH CLOUD CLEARS 04:00CLOUD RETURNS 06:00
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The next week of nights

Tonight · 12 Aug
51
Fair
MOON 0%
04:00–06:00
Tomorrow · 13 Aug
27
Poor
MOON 1%
Friday · 14 Aug
33
Poor
MOON 5%
Saturday · 15 Aug
8
Clouded out
MOON 10%
Sunday · 16 Aug
6
Clouded out
MOON 19%
Monday · 17 Aug
6
Clouded out
MOON 28%
Tuesday · 18 Aug
7
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for Lhünzhub, 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 →