GoodSeeing
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Letlhakane

-21.415° S   25.593° E  ·  984 M
56 /100
PEAK
Worth setting up — 8 hours of workable sky from 20:00.
BEST WINDOW 20:00–04:00 · ASTRO DARK 20:00–06:00 · MOON 0%
Transparency
0.59
Seeing
0.40
Cloud
13%
Moon
0%

Good tonight

Hour by hour, local to Letlhakane. 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
37
56
51
46
50
55
56
55
50
16
38
20
0
BEST WINDOW
Low cloud
17%
17%
23%
31%
22%
11%
13%
14%
22%
74%
41%
16%
9%
Mid cloud
0%
0%
0%
0%
4%
6%
2%
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.59
0.55
0.53
0.51
0.49
0.47
0.46
0.43
0.40
0.40
0.40
0.37
0.39
Seeing
0.24
0.30
0.30
0.30
0.31
0.31
0.32
0.34
0.35
0.34
0.39
0.40
0.40
Moon clear
down
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 Fair · 37/100
Starting from
100
Cloud
−17
Transparency
−14
Seeing
−13
Moonlight
−0
Darkness
−20
Score
37
CLOUD 17% LOW 17% MID 0% HIGH 0% SUN -13.8° MOON -13.0° / 0% WIND 10 TEMP 14°
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 20:00–04:00 · 8H · MEAN 59

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

19212301030507
ASTRONOMICAL DARK FROM 20:00CLOUD RETURNS 04:00
SET UP 18:30 · OBSERVE 19:00–04:00 · 9H · MEAN 48

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

19212301030507
CLOUD RETURNS 04:00SEEING STAYS SOFT THROUGHOUTMOONLIGHT IGNORED FOR THIS TARGET
SET UP 18:30 · OBSERVE 19:00–04:00 · 9H · MEAN 56

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

19212301030507
CLOUD RETURNS 04:00
SET UP 19:30 · OBSERVE 20:00–04:00 · 8H · MEAN 46

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

19212301030507
ASTRONOMICAL DARK FROM 20:00CLOUD RETURNS 04:00
SET UP 18:30 · OBSERVE 19:00–04:00 · 9H · MEAN 60

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

19212301030507
CLOUD RETURNS 04:00
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The next week of nights

Tonight · 12 Aug
56
Good
MOON 0%
20:00–04:00
Tomorrow · 13 Aug
77
Excellent
MOON 2%
20:00–06:00
Friday · 14 Aug
87
Excellent
MOON 6%
20:00–06:00
Saturday · 15 Aug
92
Excellent
MOON 13%
20:00–21:00
Sunday · 16 Aug
89
Excellent
MOON 21%
20:00–21:00
Monday · 17 Aug
88
Excellent
MOON 30%
02:00–03:00
Tuesday · 18 Aug
94
Excellent
MOON 39%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Letlhakane, Botswana 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 →