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As Sulayyil

20.461° N   45.578° E  ·  606 M
79 /100
PEAK
A genuinely good night — 2 hours of clear, dark sky from 03:00.
BEST WINDOW 03:00–05:00 · ASTRO DARK 21:00–05:00 · MOON 0%
Transparency
1.00
Seeing
0.97
Cloud
7%
Moon
0%

Excellent tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
21
22
23
00
01
02
03
04
05
06
41
13
11
13
9
33
55
79
23
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
52%
90%
83%
83%
99%
58%
15%
2%
2%
4%
High cloud
40%
52%
100%
88%
19%
50%
63%
34%
6%
2%
Transparency
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Seeing
0.95
0.95
0.97
0.90
0.89
0.83
0.92
0.91
0.81
0.91
Moon clear
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
21 Fair · 41/100
Starting from
100
Cloud
−59
Transparency
−0
Seeing
−1
Moonlight
−0
Darkness
−0
Score
41
CLOUD 71% LOW 0% MID 52% HIGH 40% SUN -32.8° MOON -31.0° / 0% WIND 3 TEMP 40°
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 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 65

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

2123010305
TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 62

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

2123010305
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 59

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

2123010305
TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 50

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

2123010305
TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 60

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

2123010305
TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
79
Excellent
MOON 0%
03:00–05:00
Tomorrow · 13 Aug
97
Excellent
MOON 2%
20:00–05:00
Friday · 14 Aug
99
Excellent
MOON 6%
20:00–05:00
Saturday · 15 Aug
94
Excellent
MOON 13%
03:00–04:00
Sunday · 16 Aug
99
Excellent
MOON 21%
03:00–04:00
Monday · 17 Aug
96
Excellent
MOON 30%
03:00–04:00
Tuesday · 18 Aug
80
Excellent
MOON 39%
03:00–04:00
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About this forecast

Conditions for As Sulayyil, Saudi Arabia 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 →