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Ma'rib

15.463° N   45.326° E  ·  1095 M
85 /100
PEAK
A genuinely good night — 4 hours of clear, dark sky from 01:00.
BEST WINDOW 01:00–05:00 · ASTRO DARK 21:00–05:00 · MOON 0%
Transparency
1.00
Seeing
1.00
Cloud
21%
Moon
0%

Excellent tonight

Hour by hour, local to Ma'rib. 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
21
28
11
27
53
80
78
85
28
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
61%
45%
84%
61%
23%
1%
19%
1%
27%
18%
High cloud
95%
96%
97%
69%
56%
32%
12%
21%
5%
0%
Transparency
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Seeing
0.91
0.95
0.77
0.82
0.85
0.90
1.00
0.86
0.79
0.70
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 Poor · 21/100
Starting from
100
Cloud
−78
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−0
Score
21
CLOUD 98% LOW 0% MID 61% HIGH 95% SUN -35.3° MOON -33.5° / 0% WIND 3 TEMP 34°
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
Why thin high cloud ruins long exposures

Cirrus you can barely see will halo your bright stars, lift your background and vary between frames. Visual observers shrug it off. Long exposures integrate it, so it accumulates.

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 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 73

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

2123010305
CLOUD BREAKS 01:00TWILIGHT BEGINS 05:00
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 67

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

2123010305
CLOUD BREAKS 01:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 69

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

2123010305
CLOUD BREAKS 01:00TWILIGHT BEGINS 05:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 70

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

2123010305
HIGH CLOUD CLEARS 02:00TWILIGHT BEGINS 05:00
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 69

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

2123010305
CLOUD BREAKS 01:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
85
Excellent
MOON 0%
01:00–05:00
Tomorrow · 13 Aug
96
Excellent
MOON 2%
20:00–05:00
Friday · 14 Aug
94
Excellent
MOON 6%
20:00–05:00
Saturday · 15 Aug
85
Excellent
MOON 13%
03:00–04:00
Sunday · 16 Aug
82
Excellent
MOON 21%
03:00–04:00
Monday · 17 Aug
86
Excellent
MOON 30%
03:00–04:00
Tuesday · 18 Aug
98
Excellent
MOON 39%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Ma'rib, Yemen 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 →