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Cheongsong gun

36.434° N   129.057° E  ·  197 M
62 /100
PEAK
Worth setting up — 2 hours of workable sky from 03:00.
BEST WINDOW 03:00–05:00 · ASTRO DARK 02:00–05:00 · MOON 0%
Transparency
0.27
Seeing
0.98
Cloud
9%
Moon
0%

Good tonight

Hour by hour, local to Cheongsong gun. 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
23
54
62
10
0
BEST WINDOW
Low cloud
66%
20%
7%
16%
17%
Mid cloud
2%
4%
1%
1%
2%
High cloud
0%
0%
2%
6%
1%
Transparency
0.27
0.26
0.22
0.20
0.21
Seeing
0.91
0.92
0.95
0.98
0.97
Moon clear
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
02 Poor · 23/100
Starting from
100
Cloud
−67
Transparency
−10
Seeing
−1
Moonlight
−0
Darkness
−0
Score
23
CLOUD 66% LOW 66% MID 2% HIGH 0% SUN -34.3° MOON -33.9° / 0% WIND 3 TEMP 22°
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 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 58

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

020406
CLOUD BREAKS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 62

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

020406
CLOUD BREAKS 03:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 55

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

020406
CLOUD BREAKS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 44

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

020406
CLOUD BREAKS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 61

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

020406
CLOUD BREAKS 03:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
62
Good
MOON 0%
03:00–05:00
Tomorrow · 13 Aug
24
Poor
MOON 1%
Friday · 14 Aug
20
Poor
MOON 5%
Saturday · 15 Aug
29
Poor
MOON 8%
Sunday · 16 Aug
6
Clouded out
MOON 19%
Monday · 17 Aug
50
Fair
MOON 28%
21:00–22:00
Tuesday · 18 Aug
36
Fair
MOON 37%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Cheongsong gun, South Korea 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 →