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Faya-Largeau

17.926° N   19.104° E  ·  242 M
51 /100
PEAK
Marginal, but there is a 2 hours gap from 03:00.
BEST WINDOW 03:00–05:00 · ASTRO DARK 20:00–05:00 · MOON 0%
Transparency
1.00
Seeing
0.94
Cloud
52%
Moon
0%

Fair tonight

Hour by hour, local to Faya-Largeau. 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
8
9
8
10
28
9
10
14
51
36
1
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
88%
100%
100%
100%
76%
100%
100%
95%
52%
70%
75%
59%
High cloud
31%
11%
38%
0%
12%
10%
2%
1%
2%
2%
35%
2%
Transparency
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Seeing
0.85
0.89
0.83
0.84
0.81
0.80
0.84
0.89
0.88
0.94
0.86
0.75
Moon clear
down
down
down
down
down
down
down
down
down
down
down
0%
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 · 8/100
Starting from
100
Cloud
−83
Transparency
−0
Seeing
−1
Moonlight
−0
Darkness
−9
Score
8
CLOUD 89% LOW 0% MID 88% HIGH 31% SUN -11.6° MOON -9.8° / 0% WIND 4 TEMP 36°
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 45

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

192123010305
CLOUD BREAKS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 43

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

192123010305
CLOUD BREAKS 03:00TWILIGHT BEGINS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 45

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

192123010305
CLOUD BREAKS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 40

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

192123010305
CLOUD BREAKS 03:00CLOUD RETURNS 04:00
SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 46

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

192123010305
CLOUD BREAKS 03:00CLOUD RETURNS 04:00
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The next week of nights

Tonight · 12 Aug
51
Fair
MOON 0%
03:00–05:00
Tomorrow · 13 Aug
94
Excellent
MOON 2%
20:00–05:00
Friday · 14 Aug
78
Excellent
MOON 6%
20:00–01:00
Saturday · 15 Aug
63
Good
MOON 13%
01:00–02:00
Sunday · 16 Aug
83
Excellent
MOON 21%
01:00–02:00
Monday · 17 Aug
81
Excellent
MOON 30%
01:00–02:00
Tuesday · 18 Aug
95
Excellent
MOON 39%
01:00–02:00
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About this forecast

Conditions for Faya-Largeau, Chad 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 →