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Jianguang

28.194° N   115.784° E  ·  31 M
62 /100
PEAK
Worth setting up — 5 hours of workable sky from 00:00.
BEST WINDOW 00:00–05:00 · ASTRO DARK 00:00–05:00 · MOON 0%
Transparency
0.34
Seeing
1.00
Cloud
13%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
00
01
02
03
04
05
06
60
62
62
35
51
21
0
BEST WINDOW
Low cloud
0%
2%
0%
2%
4%
2%
5%
Mid cloud
20%
14%
12%
55%
27%
14%
13%
High cloud
0%
1%
2%
2%
2%
1%
0%
Transparency
0.34
0.30
0.26
0.25
0.25
0.26
0.24
Seeing
1.00
1.00
1.00
1.00
0.99
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
00 Good · 60/100
Starting from
100
Cloud
−18
Transparency
−22
Seeing
−0
Moonlight
−0
Darkness
−0
Score
60
CLOUD 20% LOW 0% MID 20% HIGH 0% SUN -46.5° MOON -45.3° / 0% WIND 1 TEMP 27°
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 23:30 · OBSERVE 00:00–03:00 · 3H · MEAN 61

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

00020406
CLOUD RETURNS 03:00
SET UP 23:30 · OBSERVE 00:00–06:00 · 6H · MEAN 64

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

00020406
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–03:00 · 3H · MEAN 57

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

00020406
CLOUD RETURNS 03:00
SET UP 23:30 · OBSERVE 00:00–03:00 · 3H · MEAN 47

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

00020406
CLOUD RETURNS 03:00
SET UP 23:30 · OBSERVE 00:00–03:00 · 3H · MEAN 63

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

00020406
CLOUD RETURNS 03:00
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The next week of nights

Tonight · 12 Aug
62
Good
MOON 0%
00:00–05:00
Tomorrow · 13 Aug
32
Poor
MOON 1%
Friday · 14 Aug
62
Good
MOON 5%
22:00–05:00
Saturday · 15 Aug
16
Poor
MOON 10%
Sunday · 16 Aug
66
Good
MOON 19%
02:00–03:00
Monday · 17 Aug
64
Good
MOON 28%
02:00–03:00
Tuesday · 18 Aug
43
Fair
MOON 37%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Jianguang, 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 →