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Haidong Zhen

25.710° N   100.261° E  ·  1970 M
61 /100
PEAK
Worth setting up — 2 hours of workable sky from 04:00.
BEST WINDOW 04:00–06:00 · ASTRO DARK 01:00–06:00 · MOON 0%
Transparency
0.23
Seeing
1.00
Cloud
12%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
01
02
03
04
05
06
07
61
4
2
38
56
22
0
BEST WINDOW
Low cloud
1%
74%
77%
13%
3%
2%
3%
Mid cloud
10%
11%
12%
19%
8%
9%
9%
High cloud
1%
0%
3%
34%
13%
43%
21%
Transparency
0.19
0.18
0.17
0.21
0.23
0.21
0.20
Seeing
1.00
1.00
1.00
1.00
1.00
1.00
1.00
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
01 Good · 61/100
Starting from
100
Cloud
−10
Transparency
−29
Seeing
−0
Moonlight
−0
Darkness
−0
Score
61
CLOUD 12% LOW 1% MID 10% HIGH 1% SUN -48.9° MOON -47.8° / 0% WIND 1 TEMP 19°
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.

SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 47

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

01030507
CLOUD BREAKS 04:00CLOUD RETURNS 06:00
SET UP 03:30 · OBSERVE 04:00–07:00 · 3H · MEAN 55

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

01030507
CLOUD BREAKS 04:00TWILIGHT BEGINS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–02:00 · 1H · MEAN 56

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

01030507
CLOUD RETURNS 02:00
SET UP 00:30 · OBSERVE 01:00–02:00 · 1H · MEAN 46

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

01030507
CLOUD RETURNS 02:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 46

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

01030507
CLOUD BREAKS 04:00CLOUD RETURNS 06:00
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The next week of nights

Tonight · 12 Aug
61
Good
MOON 0%
04:00–06:00
Tomorrow · 13 Aug
68
Good
MOON 1%
22:00–01:00
Friday · 14 Aug
69
Good
MOON 5%
22:00–01:00
Saturday · 15 Aug
7
Clouded out
MOON 10%
Sunday · 16 Aug
22
Poor
MOON 19%
Monday · 17 Aug
9
Clouded out
MOON 28%
Tuesday · 18 Aug
4
Clouded out
MOON 37%
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About this forecast

Conditions for Haidong 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 →