GoodSeeing
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Yichun

47.721° N   128.875° E  ·  225 M
45 /100
PEAK
Marginal, but there is a 1 hour gap from 02:00.
BEST WINDOW 02:00–03:00 · ASTRO DARK 01:00–03:00 · MOON 0%
Transparency
0.10
Seeing
1.00
Cloud
38%
Moon
0%

Fair tonight

Hour by hour, local to Yichun. 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
0
45
3
0
BEST WINDOW
Low cloud
100%
4%
84%
100%
Mid cloud
27%
14%
2%
7%
High cloud
31%
30%
77%
81%
Transparency
0.10
0.10
0.10
0.18
Seeing
0.97
1.00
1.00
1.00
Moon clear
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 Clouded out · 0/100
Starting from
100
Cloud
−100
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−0
Score
0
CLOUD 100% LOW 100% MID 27% HIGH 31% SUN -24.2° MOON -23.6° / 0% WIND 2 TEMP 21°
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 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.

0103
CLOUD BREAKS 02:00CLOUD RETURNS 03:00
SET UP 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 58

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

0103
CLOUD BREAKS 02:00CLOUD RETURNS 03:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 37

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

0103
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.

0103
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 44

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

0103
CLOUD BREAKS 02:00CLOUD RETURNS 03:00
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The next week of nights

Tonight · 12 Aug
45
Fair
MOON 0%
02:00–03:00
Tomorrow · 13 Aug
41
Fair
MOON 1%
02:00–03:00
Friday · 14 Aug
53
Fair
MOON 5%
02:00–03:00
Saturday · 15 Aug
68
Good
MOON 10%
02:00–03:00
Sunday · 16 Aug
18
Poor
MOON 19%
Monday · 17 Aug
0
Clouded out
MOON 28%
Tuesday · 18 Aug
51
Fair
MOON 37%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Yichun, 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 →