GoodSeeing
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Xuanhua

40.612° N   115.065° E  ·  607 M
75 /100
PEAK
A genuinely good night — 3 hours of clear, dark sky from 01:00.
BEST WINDOW 01:00–04:00 · ASTRO DARK 00:00–04:00 · MOON 0%
Transparency
0.38
Seeing
1.00
Cloud
0%
Moon
0%

Excellent tonight

Hour by hour, local to Xuanhua. 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
33
64
74
75
57
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
3%
2%
Mid cloud
2%
0%
0%
0%
0%
2%
High cloud
99%
25%
0%
0%
0%
0%
Transparency
0.37
0.36
0.36
0.37
0.38
0.40
Seeing
1.00
1.00
1.00
1.00
1.00
1.00
Moon clear
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 Poor · 33/100
Starting from
100
Cloud
−56
Transparency
−11
Seeing
−0
Moonlight
−0
Darkness
−0
Score
33
CLOUD 99% LOW 0% MID 2% HIGH 99% SUN -34.1° MOON -32.9° / 0% WIND 2 TEMP 19°
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 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 66

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

000204
HIGH CLOUD CLEARS 01:00TWILIGHT BEGINS 05:00
SET UP 23:30 · OBSERVE 00:00–05:00 · 5H · MEAN 74

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

000204
TWILIGHT BEGINS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 62

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

000204
HIGH CLOUD CLEARS 01:00TWILIGHT BEGINS 05:00
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 54

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

000204
HIGH CLOUD CLEARS 01:00TWILIGHT BEGINS 05:00
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 69

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

000204
HIGH CLOUD CLEARS 01:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
75
Excellent
MOON 0%
01:00–04:00
Tomorrow · 13 Aug
68
Good
MOON 1%
21:00–04:00
Friday · 14 Aug
43
Fair
MOON 5%
21:00–23:00
Saturday · 15 Aug
10
Clouded out
MOON 10%
Sunday · 16 Aug
73
Good
MOON 19%
02:00–03:00
Monday · 17 Aug
35
Fair
MOON 28%
02:00–03:00
Tuesday · 18 Aug
52
Fair
MOON 37%
02:00–03:00
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About this forecast

Conditions for Xuanhua, 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 →