GoodSeeing
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Arewusitang

43.798° N   81.524° E  ·  663 M
75 /100
PEAK
A genuinely good night — 5 hours of clear, dark sky from 23:00.
BEST WINDOW 23:00–04:00 · ASTRO DARK 23:00–04:00 · MOON 0%
Transparency
0.49
Seeing
0.97
Cloud
2%
Moon
0%

Excellent tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
23
00
01
02
03
04
05
06
69
73
75
74
75
60
3
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
7%
4%
3%
4%
2%
0%
0%
1%
High cloud
8%
2%
0%
1%
0%
2%
48%
32%
Transparency
0.49
0.46
0.46
0.45
0.43
0.42
0.41
0.42
Seeing
0.90
0.93
0.92
0.94
0.96
0.96
0.97
0.94
Moon clear
down
down
down
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
23 Good · 69/100
Starting from
100
Cloud
−10
Transparency
−18
Seeing
−2
Moonlight
−0
Darkness
−0
Score
69
CLOUD 9% LOW 0% MID 7% HIGH 8% SUN -27.0° MOON -25.7° / 0% WIND 3 TEMP 21°
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 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 71

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

23010305
CLOUD RETURNS 05:00
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 83

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

23010305
CLOUD RETURNS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 68

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

23010305
CLOUD RETURNS 05:00
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 60

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

23010305
CLOUD RETURNS 05:00
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 74

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

23010305
CLOUD RETURNS 05:00
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The next week of nights

Tonight · 12 Aug
75
Excellent
MOON 0%
23:00–04:00
Tomorrow · 13 Aug
79
Excellent
MOON 2%
22:00–04:00
Friday · 14 Aug
62
Good
MOON 6%
22:00–04:00
Saturday · 15 Aug
80
Excellent
MOON 12%
00:00–01:00
Sunday · 16 Aug
89
Excellent
MOON 19%
00:00–01:00
Monday · 17 Aug
63
Good
MOON 28%
00:00–01:00
Tuesday · 18 Aug
83
Excellent
MOON 37%
00:00–01:00
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Nearby locations

About this forecast

Conditions for Arewusitang, 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 →