GoodSeeing
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Adamstown

-25.066° S   130.101° W  ·  67 M
81 /100
PEAK
A genuinely good night — 7 hours of clear, dark sky from 00:00.
BEST WINDOW 00:00–07:00 · ASTRO DARK 20:00–06:00 · MOON 1%
Transparency
0.71
Seeing
0.69
Cloud
0%
Moon
1%

Excellent tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
18
19
20
21
22
23
00
01
02
03
04
05
06
07
0
19
81
72
23
20
39
47
49
52
41
61
45
0
BEST WINDOW
Low cloud
0%
0%
0%
9%
71%
75%
48%
37%
35%
31%
45%
19%
30%
49%
Mid cloud
0%
0%
0%
0%
0%
0%
1%
1%
1%
0%
0%
0%
0%
0%
High cloud
83%
32%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.73
0.71
0.69
0.68
0.69
0.66
0.61
0.62
0.65
0.65
0.63
0.63
0.62
0.54
Seeing
0.69
0.69
0.68
0.66
0.64
0.61
0.59
0.54
0.51
0.51
0.51
0.53
0.51
0.50
Moon clear
0%
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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
18 Clouded out · 0/100
Starting from
100
Cloud
−46
Transparency
−6
Seeing
−4
Moonlight
−0
Darkness
−45
Score
0
CLOUD 83% LOW 0% MID 0% HIGH 83% SUN 3.7° MOON 9.4° / 0% WIND 5 TEMP 20°
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
What the GoodSeeing score actually measures

One number from 0 to 100 per hour, combining cloud, transparency, seeing, moonlight and darkness. Cloud gates everything else — no amount of steady, dark air rescues an overcast sky.

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 00:00–07:00 · 7H · MEAN 51

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

18202200020406
CLOUD BREAKS 00:00CLOUD RETURNS 07:00
SET UP 23:30 · OBSERVE 00:00–07:00 · 7H · MEAN 46

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

18202200020406
CLOUD BREAKS 00:00CLOUD RETURNS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–07:00 · 7H · MEAN 51

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

18202200020406
CLOUD BREAKS 00:00CLOUD RETURNS 07:00
SET UP 00:30 · OBSERVE 01:00–04:00 · 3H · MEAN 41

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

18202200020406
SET UP 23:30 · OBSERVE 00:00–07:00 · 7H · MEAN 51

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

18202200020406
CLOUD BREAKS 00:00CLOUD RETURNS 07:00
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The next week of nights

Tonight · 12 Aug
81
Excellent
MOON 1%
00:00–07:00
Tomorrow · 13 Aug
56
Good
MOON 4%
20:00–21:00
Friday · 14 Aug
46
Fair
MOON 7%
22:00–23:00
Saturday · 15 Aug
45
Fair
MOON 17%
22:00–23:00
Sunday · 16 Aug
55
Good
MOON 25%
22:00–23:00
Monday · 17 Aug
59
Good
MOON 35%
04:00–05:00
Tuesday · 18 Aug
17
Poor
MOON 44%
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About this forecast

Conditions for Adamstown, Pitcairn Islands 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 →