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Arivonimamo

-19.017° S   47.183° E  ·  1418 M
65 /100
PEAK
Worth setting up — 7 hours of workable sky from 23:00.
BEST WINDOW 23:00–06:00 · ASTRO DARK 21:00–05:00 · MOON 0%
Transparency
0.50
Seeing
1.00
Cloud
5%
Moon
0%

Good tonight

Hour by hour, local to Arivonimamo. 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
39
21
41
42
49
50
42
64
65
0
BEST WINDOW
Low cloud
9%
6%
5%
6%
15%
15%
21%
5%
4%
9%
Mid cloud
48%
77%
44%
39%
15%
13%
23%
2%
1%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.50
0.39
0.35
0.29
0.23
0.20
0.20
0.22
0.23
0.24
Seeing
0.79
0.79
0.83
0.86
0.87
0.92
0.94
0.99
1.00
0.98
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 Fair · 39/100
Starting from
100
Cloud
−48
Transparency
−10
Seeing
−2
Moonlight
−0
Darkness
−0
Score
39
CLOUD 49% LOW 9% MID 48% HIGH 0% SUN -47.7° MOON -46.2° / 0% WIND 4 TEMP 17°
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
Conditions for planets and the Moon

Seeing is everything. Darkness and moonlight barely matter, and a hazy, humid night that ruins deep-sky work is often the steadiest night of the year for planetary detail.

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 22:30 · OBSERVE 23:00–06:00 · 7H · MEAN 51

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

2123010305
CLOUD BREAKS 23:00TWILIGHT BEGINS 06:00
SET UP 22:30 · OBSERVE 23:00–06:00 · 7H · MEAN 61

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

2123010305
CLOUD BREAKS 23:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 22:30 · OBSERVE 23:00–06:00 · 7H · MEAN 48

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

2123010305
CLOUD BREAKS 23:00TWILIGHT BEGINS 06:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 51

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

2123010305
CLOUD BREAKS 04:00TWILIGHT BEGINS 06:00
SET UP 22:30 · OBSERVE 23:00–06:00 · 7H · MEAN 52

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

2123010305
CLOUD BREAKS 23:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
65
Good
MOON 0%
23:00–06:00
Tomorrow · 13 Aug
56
Good
MOON 2%
00:00–05:00
Friday · 14 Aug
68
Good
MOON 6%
02:00–06:00
Saturday · 15 Aug
21
Poor
MOON 13%
Sunday · 16 Aug
30
Poor
MOON 21%
Monday · 17 Aug
33
Poor
MOON 30%
Tuesday · 18 Aug
14
Clouded out
MOON 39%
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Nearby locations

About this forecast

Conditions for Arivonimamo, Madagascar 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 →