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Mangnai Zhen

38.386° N   90.156° E  ·  3193 M
69 /100
PEAK
Worth setting up — 4 hours of workable sky from 02:00.
BEST WINDOW 02:00–06:00 · ASTRO DARK 02:00–06:00 · MOON 0%
Transparency
1.00
Seeing
0.45
Cloud
21%
Moon
0%

Good tonight

Hour by hour, local to Mangnai Zhen. 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
41
69
49
45
17
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
1%
1%
Mid cloud
57%
21%
44%
48%
73%
100%
High cloud
0%
0%
0%
0%
0%
0%
Transparency
1.00
0.98
0.85
0.81
0.81
0.83
Seeing
0.39
0.42
0.43
0.45
0.41
0.46
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 Fair · 41/100
Starting from
100
Cloud
−51
Transparency
−0
Seeing
−7
Moonlight
−0
Darkness
−0
Score
41
CLOUD 57% LOW 0% MID 57% HIGH 0% SUN -36.7° MOON -35.9° / 0% WIND 8 TEMP 17°
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
Transparency vs seeing

Transparency is how much light gets through the atmosphere. Seeing is how steady it is. They are independent, they often move in opposite directions, and which one matters depends entirely on what you are pointing at.

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 02:00–06:00 · 4H · MEAN 57

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

020406
CLOUD RETURNS 06:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 46

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

020406
CLOUD BREAKS 03:00CLOUD RETURNS 06:00SEEING STAYS SOFT THROUGHOUT
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 58

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

020406
CLOUD RETURNS 06:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 49

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

020406
CLOUD BREAKS 03:00CLOUD RETURNS 06:00
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 55

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

020406
CLOUD RETURNS 06:00
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The next week of nights

Tonight · 12 Aug
69
Good
MOON 0%
02:00–06:00
Tomorrow · 13 Aug
18
Poor
MOON 1%
Friday · 14 Aug
38
Fair
MOON 5%
23:00–00:00
Saturday · 15 Aug
1
Clouded out
MOON 10%
Sunday · 16 Aug
70
Good
MOON 19%
02:00–03:00
Monday · 17 Aug
89
Excellent
MOON 28%
02:00–03:00
Tuesday · 18 Aug
98
Excellent
MOON 37%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Mangnai Zhen, 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 →