GoodSeeing
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Port Moresby

-9.477° S   147.151° E  ·  25 M
59 /100
PEAK
Worth setting up — 2 hours of workable sky from 04:00.
BEST WINDOW 04:00–06:00 · ASTRO DARK 04:00–06:00 · MOON 0%
Transparency
0.35
Seeing
0.69
Cloud
13%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
04
05
06
07
59
57
2
0
BEST WINDOW
Low cloud
11%
13%
17%
27%
Mid cloud
0%
0%
0%
0%
High cloud
2%
1%
9%
35%
Transparency
0.35
0.33
0.28
0.27
Seeing
0.60
0.62
0.69
0.65
Moon clear
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
04 Good · 59/100
Starting from
100
Cloud
−12
Transparency
−23
Seeing
−7
Moonlight
−0
Darkness
−0
Score
59
CLOUD 13% LOW 11% MID 0% HIGH 2% SUN -35.3° MOON -37.1° / 0% WIND 6 TEMP 24°
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 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 62

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

0406
TWILIGHT BEGINS 06:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 62

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

0406
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 59

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

0406
TWILIGHT BEGINS 06:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 48

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

0406
TWILIGHT BEGINS 06:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 67

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

0406
TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
59
Good
MOON 0%
04:00–06:00
Tomorrow · 13 Aug
55
Good
MOON 1%
20:00–01:00
Friday · 14 Aug
64
Good
MOON 5%
20:00–06:00
Saturday · 15 Aug
52
Fair
MOON 8%
04:00–05:00
Sunday · 16 Aug
74
Good
MOON 19%
04:00–05:00
Monday · 17 Aug
67
Good
MOON 28%
22:00–23:00
Tuesday · 18 Aug
64
Good
MOON 37%
22:00–23:00
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Nearby locations

About this forecast

Conditions for Port Moresby, Papua New Guinea 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 →