GoodSeeing
Home › Locations › Chek Chue

Chek Chue

22.218° N   114.212° E  ·  12 M
46 /100
PEAK
Marginal, but there is a 3 hours gap from 02:00.
BEST WINDOW 02:00–05:00 · ASTRO DARK 02:00–05:00 · MOON 0%
Transparency
0.43
Seeing
0.53
Cloud
40%
Moon
0%

Fair tonight

Hour by hour, local to Chek Chue. 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
45
40
46
26
0
BEST WINDOW
Low cloud
20%
12%
10%
14%
23%
Mid cloud
2%
6%
8%
15%
20%
High cloud
23%
49%
29%
38%
52%
Transparency
0.35
0.36
0.37
0.43
0.41
Seeing
0.53
0.53
0.52
0.52
0.53
Moon clear
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 · 45/100
Starting from
100
Cloud
−32
Transparency
−18
Seeing
−6
Moonlight
−0
Darkness
−0
Score
45
CLOUD 40% LOW 20% MID 2% HIGH 23% SUN -46.6° MOON -46.9° / 0% WIND 7 TEMP 29°
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
What the GoodSeeing score actually measures

One number from 0 to 100 per hour, combining cloud, transparency, seeing, moonlight and darkness. Cloud gates everything else — no amount of steady, dark air rescues an overcast sky.

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 02:00–05:00 · 3H · MEAN 46

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

020406
TWILIGHT BEGINS 05:00
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 42

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

020406
CLOUD RETURNS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 41

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

020406
TWILIGHT BEGINS 05:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

020406
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 46

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

020406
TWILIGHT BEGINS 05:00
Advertisement
Reserved

The next week of nights

Tonight · 12 Aug
46
Fair
MOON 0%
02:00–05:00
Tomorrow · 13 Aug
23
Poor
MOON 1%
Friday · 14 Aug
28
Poor
MOON 5%
Saturday · 15 Aug
38
Fair
MOON 10%
02:00–03:00
Sunday · 16 Aug
25
Poor
MOON 19%
Monday · 17 Aug
49
Fair
MOON 28%
02:00–03:00
Tuesday · 18 Aug
7
Clouded out
MOON 37%
Advertisement
Reserved

Nearby locations

About this forecast

Conditions for Chek Chue, Hong Kong 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 →