GoodSeeing
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Ksar

18.099° N   15.957° W  ·  5 M
68 /100
PEAK
Worth setting up — 9 hours of workable sky from 21:00.
BEST WINDOW 21:00–06:00 · ASTRO DARK 21:00–06:00 · MOON 0%
Transparency
0.40
Seeing
0.65
Cloud
0%
Moon
0%

Good tonight

Hour by hour, local to Ksar. 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
0
6
68
67
67
67
66
62
62
64
63
25
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
1%
18%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
1%
1%
1%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
2%
4%
0%
2%
13%
2%
Transparency
0.42
0.40
0.39
0.37
0.37
0.37
0.36
0.36
0.35
0.33
0.32
0.32
0.33
Seeing
0.70
0.65
0.60
0.58
0.57
0.58
0.55
0.43
0.48
0.51
0.52
0.48
0.51
Moon clear
0%
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 Clouded out · 0/100
Starting from
100
Cloud
−0
Transparency
−23
Seeing
−6
Moonlight
−0
Darkness
−71
Score
0
CLOUD 0% LOW 0% MID 0% HIGH 0% SUN 6.7° MOON 9.1° / 0% WIND 5 TEMP 27°
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 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 70

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

19212301030507
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 06:00
SET UP 19:30 · OBSERVE 20:00–07:00 · 11H · MEAN 63

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

19212301030507
TWILIGHT BEGINS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 68

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

19212301030507
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 58

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

19212301030507
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 78

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

19212301030507
ASTRONOMICAL DARK FROM 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
64
Good
MOON 2%
21:00–06:00
Friday · 14 Aug
61
Good
MOON 6%
21:00–06:00
Saturday · 15 Aug
37
Fair
MOON 13%
00:00–01:00
Sunday · 16 Aug
41
Fair
MOON 21%
00:00–01:00
Monday · 17 Aug
69
Good
MOON 30%
00:00–01:00
Tuesday · 18 Aug
46
Fair
MOON 39%
00:00–01:00
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Nearby locations

About this forecast

Conditions for Ksar, Mauritania 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 →