GoodSeeing
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Judian

27.306° N   99.649° E  ·  1879 M
44 /100
PEAK
Marginal, but there is a 1 hour gap from 02:00.
BEST WINDOW 02:00–03:00 · ASTRO DARK 01:00–06:00 · MOON 0%
Transparency
0.31
Seeing
1.00
Cloud
31%
Moon
0%

Fair tonight

Hour by hour, local to Judian. 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
30
44
33
27
34
14
0
BEST WINDOW
Low cloud
40%
8%
19%
27%
27%
58%
29%
Mid cloud
18%
23%
38%
32%
20%
3%
11%
High cloud
9%
5%
6%
34%
23%
1%
0%
Transparency
0.10
0.10
0.10
0.10
0.10
0.31
0.30
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 Poor · 30/100
Starting from
100
Cloud
−53
Transparency
−17
Seeing
−0
Moonlight
−0
Darkness
−0
Score
30
CLOUD 52% LOW 40% MID 18% HIGH 9% SUN -47.2° MOON -46.1° / 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.
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 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 44

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

01030507
CLOUD BREAKS 02:00CLOUD RETURNS 03:00
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 44

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 02:00–03:00 · 1H · MEAN 40

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

01030507
CLOUD BREAKS 02:00CLOUD RETURNS 03:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

01030507
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 45

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

01030507
CLOUD BREAKS 02:00CLOUD RETURNS 03:00
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The next week of nights

Tonight · 12 Aug
44
Fair
MOON 0%
02:00–03:00
Tomorrow · 13 Aug
45
Fair
MOON 1%
22:00–00:00
Friday · 14 Aug
58
Good
MOON 5%
22:00–01:00
Saturday · 15 Aug
1
Clouded out
MOON 10%
Sunday · 16 Aug
5
Clouded out
MOON 19%
Monday · 17 Aug
0
Clouded out
MOON 28%
Tuesday · 18 Aug
4
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for Judian, 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 →