GoodSeeing
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Virei

-15.727° S   12.950° E  ·  444 M
81 /100
PEAK
A genuinely good night — 10 hours of clear, dark sky from 20:00.
BEST WINDOW 20:00–06:00 · ASTRO DARK 20:00–06:00 · MOON 0%
Transparency
0.70
Seeing
1.00
Cloud
0%
Moon
0%

Excellent tonight

Hour by hour, local to Virei. 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
61
81
79
78
77
76
75
74
73
73
75
7
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.70
0.62
0.55
0.48
0.42
0.39
0.36
0.35
0.34
0.39
0.44
0.58
0.76
Seeing
0.73
0.83
0.87
0.94
1.00
1.00
1.00
1.00
0.96
0.89
0.85
0.77
0.62
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 Good · 61/100
Starting from
100
Cloud
−0
Transparency
−12
Seeing
−6
Moonlight
−0
Darkness
−21
Score
61
CLOUD 0% LOW 0% MID 0% HIGH 0% SUN -14.9° MOON -13.4° / 0% WIND 5 TEMP 21°
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 18:30 · OBSERVE 19:00–06:00 · 11H · MEAN 75

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

19212301030507
TWILIGHT BEGINS 06:00
SET UP 18:30 · OBSERVE 19:00–07:00 · 12H · MEAN 83

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

19212301030507
TWILIGHT BEGINS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 18:30 · OBSERVE 19:00–06:00 · 11H · MEAN 72

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

19212301030507
TWILIGHT BEGINS 06:00
SET UP 18:30 · OBSERVE 19:00–06:00 · 11H · MEAN 65

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

19212301030507
TWILIGHT BEGINS 06:00
SET UP 18:30 · OBSERVE 19:00–06:00 · 11H · MEAN 79

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

19212301030507
TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
81
Excellent
MOON 0%
20:00–06:00
Tomorrow · 13 Aug
89
Excellent
MOON 2%
20:00–06:00
Friday · 14 Aug
89
Excellent
MOON 6%
20:00–06:00
Saturday · 15 Aug
72
Good
MOON 13%
01:00–02:00
Sunday · 16 Aug
70
Good
MOON 21%
01:00–02:00
Monday · 17 Aug
82
Excellent
MOON 30%
01:00–02:00
Tuesday · 18 Aug
74
Good
MOON 39%
01:00–02:00
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Nearby locations

About this forecast

Conditions for Virei, Angola 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 →