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Manglai

37.275° N   79.678° E  ·  1333 M
69 /100
PEAK
Worth setting up — 2 hours of workable sky from 03:00.
BEST WINDOW 03:00–05:00 · ASTRO DARK 00:00–05:00 · MOON 0%
Transparency
1.00
Seeing
0.85
Cloud
35%
Moon
0%

Good tonight

Hour by hour, local to Manglai. 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
8
14
12
69
53
20
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
Mid cloud
98%
92%
91%
22%
47%
46%
81%
High cloud
49%
20%
53%
16%
6%
15%
24%
Transparency
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Seeing
0.85
0.82
0.79
0.77
0.80
0.71
0.58
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 Clouded out · 8/100
Starting from
100
Cloud
−92
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−0
Score
8
CLOUD 99% LOW 0% MID 98% HIGH 49% SUN -36.6° MOON -35.6° / 0% WIND 4 TEMP 27°
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
When a clear gap is worth driving for

Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.

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 03:00–05:00 · 2H · MEAN 62

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

00020406
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 50

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

00020406
HIGH CLOUD CLEARS 03:00CLOUD RETURNS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 62

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

00020406
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 51

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

00020406
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 58

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

00020406
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
69
Good
MOON 0%
03:00–05:00
Tomorrow · 13 Aug
89
Excellent
MOON 2%
01:00–05:00
Friday · 14 Aug
35
Fair
MOON 6%
01:00–02:00
Saturday · 15 Aug
72
Good
MOON 12%
00:00–01:00
Sunday · 16 Aug
100
Excellent
MOON 19%
00:00–01:00
Monday · 17 Aug
99
Excellent
MOON 28%
00:00–01:00
Tuesday · 18 Aug
98
Excellent
MOON 37%
00:00–01:00
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Nearby locations

About this forecast

Conditions for Manglai, 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 →