GoodSeeing
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Tandaltī

13.017° N   31.867° E  ·  422 M
88 /100
PEAK
A genuinely good night — 9 hours of clear, dark sky from 20:00.
BEST WINDOW 20:00–05:00 · ASTRO DARK 20:00–05:00 · MOON 0%
Transparency
0.99
Seeing
1.00
Cloud
16%
Moon
0%

Excellent tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
20
21
22
23
00
01
02
03
04
05
06
85
85
88
84
87
68
55
77
84
28
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
1%
1%
1%
1%
1%
1%
0%
0%
0%
0%
0%
High cloud
23%
23%
17%
23%
16%
49%
74%
28%
15%
19%
40%
Transparency
0.99
0.96
0.95
0.92
0.89
0.85
0.80
0.78
0.79
0.81
0.79
Seeing
0.96
1.00
1.00
1.00
1.00
1.00
1.00
0.98
0.97
0.88
0.84
Moon clear
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
20 Excellent · 85/100
Starting from
100
Cloud
−13
Transparency
−0
Seeing
−1
Moonlight
−0
Darkness
−0
Score
85
CLOUD 23% LOW 0% MID 1% HIGH 23% SUN -24.8° MOON -23.0° / 0% WIND 2 TEMP 31°
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 19:30 · OBSERVE 20:00–05:00 · 9H · MEAN 77

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

202200020406
TWILIGHT BEGINS 05:00
SET UP 19:30 · OBSERVE 20:00–06:00 · 10H · MEAN 78

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

202200020406
CLOUD RETURNS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 19:30 · OBSERVE 20:00–05:00 · 9H · MEAN 72

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

202200020406
TWILIGHT BEGINS 05:00
SET UP 19:30 · OBSERVE 20:00–02:00 · 6H · MEAN 70

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

202200020406
CLOUD RETURNS 02:00
SET UP 19:30 · OBSERVE 20:00–05:00 · 9H · MEAN 75

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

202200020406
TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
88
Excellent
MOON 0%
20:00–05:00
Tomorrow · 13 Aug
72
Good
MOON 2%
04:00–05:00
Friday · 14 Aug
80
Excellent
MOON 6%
01:00–05:00
Saturday · 15 Aug
49
Fair
MOON 13%
20:00–21:00
Sunday · 16 Aug
51
Fair
MOON 21%
20:00–21:00
Monday · 17 Aug
39
Fair
MOON 30%
20:00–21:00
Tuesday · 18 Aug
45
Fair
MOON 39%
20:00–21:00
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Nearby locations

About this forecast

Conditions for Tandaltī, Sudan 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 →