GoodSeeing
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Saint-Denis

-20.882° S   55.450° E  ·  44 M
50 /100
PEAK
Marginal, but there is a 7 hours gap from 22:00.
BEST WINDOW 22:00–05:00 · ASTRO DARK 22:00–06:00 · MOON 0%
Transparency
0.55
Seeing
0.94
Cloud
22%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
22
23
00
01
02
03
04
05
06
07
50
46
50
50
45
41
37
34
14
0
BEST WINDOW
Low cloud
22%
27%
20%
20%
24%
28%
32%
35%
34%
31%
Mid cloud
14%
9%
6%
2%
2%
3%
2%
2%
2%
2%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.52
0.52
0.54
0.55
0.54
0.54
0.55
0.54
0.55
0.56
Seeing
0.82
0.83
0.88
0.87
0.89
0.93
0.94
0.94
0.94
0.89
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
22 Fair · 50/100
Starting from
100
Cloud
−36
Transparency
−12
Seeing
−2
Moonlight
−0
Darkness
−0
Score
50
CLOUD 33% LOW 22% MID 14% HIGH 0% SUN -55.4° MOON -53.9° / 0% WIND 4 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
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 21:30 · OBSERVE 22:00–05:00 · 7H · MEAN 47

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

2200020406
SET UP 21:30 · OBSERVE 22:00–06:00 · 8H · MEAN 48

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

2200020406
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 21:30 · OBSERVE 22:00–05:00 · 7H · MEAN 45

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

2200020406
SET UP 23:30 · OBSERVE 00:00–02:00 · 2H · MEAN 38

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

2200020406
SET UP 21:30 · OBSERVE 22:00–04:00 · 6H · MEAN 46

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

2200020406
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The next week of nights

Tonight · 12 Aug
50
Fair
MOON 0%
22:00–05:00
Tomorrow · 13 Aug
39
Fair
MOON 2%
20:00–22:00
Friday · 14 Aug
45
Fair
MOON 6%
04:00–06:00
Saturday · 15 Aug
40
Fair
MOON 13%
04:00–05:00
Sunday · 16 Aug
27
Poor
MOON 21%
Monday · 17 Aug
58
Good
MOON 30%
22:00–23:00
Tuesday · 18 Aug
62
Good
MOON 39%
22:00–23:00
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Nearby locations

About this forecast

Conditions for Saint-Denis, Réunion 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 →