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Fangchenggang

21.770° N   108.357° E  ·  13 M
66 /100
PEAK
Worth setting up — 5 hours of workable sky from 01:00.
BEST WINDOW 01:00–06:00 · ASTRO DARK 01:00–06:00 · MOON 0%
Transparency
0.24
Seeing
0.95
Cloud
2%
Moon
0%

Good tonight

Hour by hour, local to Fangchenggang. 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
42
50
66
64
38
0
0
BEST WINDOW
Low cloud
0%
0%
0%
1%
1%
2%
16%
Mid cloud
0%
0%
2%
2%
2%
6%
34%
High cloud
69%
48%
0%
1%
77%
91%
93%
Transparency
0.24
0.23
0.22
0.22
0.21
0.10
0.10
Seeing
0.92
0.92
0.92
0.87
0.92
0.95
0.76
Moon clear
down
down
down
down
down
down
0%
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 Fair · 42/100
Starting from
100
Cloud
−38
Transparency
−19
Seeing
−1
Moonlight
−0
Darkness
−0
Score
42
CLOUD 69% LOW 0% MID 0% HIGH 69% SUN -53.2° MOON -52.3° / 0% WIND 3 TEMP 29°
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 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 51

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

01030507
TWILIGHT BEGINS 06:00
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 62

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

01030507
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 55

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

01030507
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 52

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

01030507
HIGH CLOUD CLEARS 03:00CLOUD RETURNS 05:00
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 58

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

01030507
CLOUD RETURNS 05:00
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The next week of nights

Tonight · 12 Aug
66
Good
MOON 0%
01:00–06:00
Tomorrow · 13 Aug
58
Good
MOON 1%
00:00–04:00
Friday · 14 Aug
61
Good
MOON 5%
21:00–23:00
Saturday · 15 Aug
61
Good
MOON 10%
02:00–03:00
Sunday · 16 Aug
46
Fair
MOON 19%
02:00–03:00
Monday · 17 Aug
29
Poor
MOON 28%
Tuesday · 18 Aug
0
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for Fangchenggang, 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 →