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El ’Ayoûn

15.558° N   11.180° W  ·  179 M
54 /100
PEAK
Marginal, but there is a 4 hours gap from 21:00.
BEST WINDOW 21:00–01:00 · ASTRO DARK 21:00–06:00 · MOON 0%
Transparency
0.52
Seeing
0.94
Cloud
49%
Moon
0%

Fair tonight

Hour by hour, local to El ’Ayoûn. 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
20
46
38
42
54
34
35
34
34
33
5
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
Mid cloud
1%
1%
1%
1%
1%
1%
0%
0%
0%
0%
0%
0%
1%
High cloud
94%
91%
75%
92%
79%
48%
98%
94%
98%
96%
98%
96%
88%
Transparency
0.53
0.52
0.52
0.48
0.46
0.46
0.44
0.44
0.43
0.41
0.40
0.40
0.39
Seeing
1.00
0.94
0.91
0.89
0.84
0.80
0.81
0.77
0.79
0.75
0.74
0.73
0.72
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
−52
Transparency
−9
Seeing
−0
Moonlight
−0
Darkness
−39
Score
0
CLOUD 94% LOW 0% MID 1% HIGH 94% SUN 1.7° MOON 4.1° / 0% WIND 2 TEMP 30°
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
When a clear gap is worth driving for

Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.

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 21:00–01:00 · 4H · MEAN 43

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

19212301030507
HIGH CLOUD CLEARS 21:00CLOUD RETURNS 01:00
SET UP 19:30 · OBSERVE 20:00–04:00 · 8H · MEAN 41

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

19212301030507
MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 46

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

19212301030507
HIGH CLOUD CLEARS 00:00CLOUD RETURNS 01:00
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 35

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

19212301030507
HIGH CLOUD CLEARS 00:00CLOUD RETURNS 01:00
SET UP 22:30 · OBSERVE 23:00–01:00 · 2H · MEAN 45

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

19212301030507
CLOUD RETURNS 01:00
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The next week of nights

Tonight · 12 Aug
54
Fair
MOON 0%
21:00–01:00
Tomorrow · 13 Aug
76
Excellent
MOON 2%
21:00–06:00
Friday · 14 Aug
41
Fair
MOON 6%
21:00–00:00
Saturday · 15 Aug
71
Good
MOON 13%
00:00–01:00
Sunday · 16 Aug
42
Fair
MOON 21%
00:00–01:00
Monday · 17 Aug
33
Poor
MOON 30%
Tuesday · 18 Aug
37
Fair
MOON 39%
00:00–01:00
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Nearby locations

About this forecast

Conditions for El ’Ayoûn, 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 →