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Mossamedes

-15.196° S   12.152° E  ·  13 M
68 /100
PEAK
Worth setting up — 9 hours of workable sky from 21:00.
BEST WINDOW 21:00–06:00 · ASTRO DARK 20:00–06:00 · MOON 0%
Transparency
0.36
Seeing
0.88
Cloud
0%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
19
20
21
22
23
00
01
02
03
04
05
06
07
20
31
61
67
67
66
65
64
64
65
68
10
0
BEST WINDOW
Low cloud
59%
57%
14%
2%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.36
0.35
0.33
0.29
0.26
0.22
0.22
0.23
0.24
0.26
0.28
0.29
0.27
Seeing
0.85
0.85
0.88
0.79
0.78
0.84
0.79
0.72
0.67
0.72
0.79
0.72
0.70
Moon clear
down
down
down
down
down
down
down
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
19 Poor · 20/100
Starting from
100
Cloud
−59
Transparency
−11
Seeing
−1
Moonlight
−0
Darkness
−10
Score
20
CLOUD 59% LOW 59% MID 0% HIGH 0% SUN -14.0° MOON -12.6° / 0% WIND 4 TEMP 17°
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 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 67

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

19212301030507
CLOUD BREAKS 21:00TWILIGHT BEGINS 06:00
SET UP 19:30 · OBSERVE 20:00–07:00 · 11H · MEAN 69

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

19212301030507
ASTRONOMICAL DARK FROM 20:00TWILIGHT BEGINS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 64

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

19212301030507
CLOUD BREAKS 21:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 54

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

19212301030507
CLOUD BREAKS 21:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 74

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

19212301030507
CLOUD BREAKS 21:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
68
Good
MOON 0%
21:00–06:00
Tomorrow · 13 Aug
69
Good
MOON 2%
20:00–01:00
Friday · 14 Aug
72
Good
MOON 6%
20:00–06:00
Saturday · 15 Aug
13
Clouded out
MOON 13%
Sunday · 16 Aug
69
Good
MOON 21%
01:00–02:00
Monday · 17 Aug
67
Good
MOON 30%
01:00–02:00
Tuesday · 18 Aug
70
Good
MOON 39%
01:00–02:00
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Nearby locations

About this forecast

Conditions for Mossamedes, Angola 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 →