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Heihe

50.244° N   127.490° E  ·  139 M
74 /100
PEAK
Worth setting up — 6 hours of workable sky from 21:00.
BEST WINDOW 21:00–03:00 · ASTRO DARK 22:00–02:00 · MOON 2%
Transparency
0.50
Seeing
0.98
Cloud
0%
Moon
2%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
19
20
21
22
23
00
01
02
03
04
0
21
65
74
74
74
73
71
31
0
BEST WINDOW
Low cloud
3%
8%
0%
0%
0%
1%
0%
0%
0%
0%
Mid cloud
8%
7%
3%
1%
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.52
0.50
0.43
0.41
0.42
0.41
0.33
0.31
0.31
0.32
Seeing
0.90
0.88
0.90
0.89
0.86
0.91
0.98
0.98
0.95
0.95
Moon clear
1%
down
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
19 Clouded out · 0/100
Starting from
100
Cloud
−10
Transparency
−17
Seeing
−2
Moonlight
−0
Darkness
−71
Score
0
CLOUD 9% LOW 3% MID 8% HIGH 0% SUN -1.6° MOON 2.4° / 1% WIND 3 TEMP 20°
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
Conditions for planets and the Moon

Seeing is everything. Darkness and moonlight barely matter, and a hazy, humid night that ruins deep-sky work is often the steadiest night of the year for planetary detail.

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 20:30 · OBSERVE 21:00–03:00 · 6H · MEAN 72

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

1921230103
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 03:00
SET UP 19:30 · OBSERVE 20:00–04:00 · 8H · MEAN 79

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

1921230103
TWILIGHT BEGINS 04:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 20:30 · OBSERVE 21:00–03:00 · 6H · MEAN 69

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

1921230103
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 03:00
SET UP 20:30 · OBSERVE 21:00–03:00 · 6H · MEAN 61

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

1921230103
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 03:00
SET UP 20:30 · OBSERVE 21:00–03:00 · 6H · MEAN 77

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

1921230103
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 03:00
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The next week of nights

Tonight · 13 Aug
74
Good
MOON 1%
21:00–03:00
Tomorrow · 14 Aug
77
Excellent
MOON 5%
21:00–03:00
Saturday · 15 Aug
35
Fair
MOON 10%
02:00–03:00
Sunday · 16 Aug
36
Fair
MOON 19%
02:00–03:00
Monday · 17 Aug
30
Poor
MOON 28%
Tuesday · 18 Aug
34
Poor
MOON 37%
Wednesday · 19 Aug
66
Good
MOON 47%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Heihe, 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 →