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Acornhoek

-24.588° S   31.095° E  ·  645 M
67 /100
PEAK
Worth setting up — 10 hours of workable sky from 20:00.
BEST WINDOW 20:00–06:00 · ASTRO DARK 19:00–06:00 · MOON 0%
Transparency
0.50
Seeing
0.50
Cloud
2%
Moon
0%

Good tonight

Hour by hour, local to Acornhoek. 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
17
37
53
51
49
48
46
47
63
63
67
2
0
BEST WINDOW
Low cloud
17%
7%
9%
14%
20%
25%
29%
28%
6%
6%
1%
1%
4%
Mid cloud
78%
45%
15%
11%
11%
7%
5%
4%
2%
2%
1%
4%
11%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
Transparency
0.49
0.50
0.49
0.47
0.48
0.48
0.48
0.49
0.49
0.47
0.45
0.46
0.51
Seeing
0.40
0.39
0.37
0.38
0.41
0.42
0.42
0.42
0.41
0.42
0.46
0.50
0.52
Moon clear
down
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 Poor · 17/100
Starting from
100
Cloud
−75
Transparency
−5
Seeing
−3
Moonlight
−0
Darkness
−0
Score
17
CLOUD 80% LOW 17% MID 78% HIGH 0% SUN -19.3° MOON -18.6° / 0% WIND 8 TEMP 14°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

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 20:00–06:00 · 10H · MEAN 58

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

19212301030507
CLOUD BREAKS 20:00TWILIGHT BEGINS 06:00
SET UP 19:30 · OBSERVE 20:00–06:00 · 10H · MEAN 50

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

19212301030507
CLOUD BREAKS 20:00TWILIGHT BEGINS 06:00SEEING STAYS SOFT THROUGHOUT
SET UP 19:30 · OBSERVE 20:00–06:00 · 10H · MEAN 57

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

19212301030507
CLOUD BREAKS 20:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 47

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

19212301030507
CLOUD BREAKS 21:00TWILIGHT BEGINS 06:00
SET UP 19:30 · OBSERVE 20:00–06:00 · 10H · MEAN 61

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

19212301030507
CLOUD BREAKS 20:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
67
Good
MOON 0%
20:00–06:00
Tomorrow · 13 Aug
74
Good
MOON 2%
19:00–06:00
Friday · 14 Aug
80
Excellent
MOON 6%
19:00–06:00
Saturday · 15 Aug
76
Excellent
MOON 13%
20:00–21:00
Sunday · 16 Aug
75
Excellent
MOON 21%
02:00–03:00
Monday · 17 Aug
79
Excellent
MOON 30%
02:00–03:00
Tuesday · 18 Aug
79
Excellent
MOON 39%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Acornhoek, South Africa 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 →