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Sivaganga

9.847° N   78.484° E  ·  103 M
48 /100
PEAK
Marginal, but there is a 7 hours gap from 22:30.
BEST WINDOW 22:30–05:30 · ASTRO DARK 22:30–05:30 · MOON 0%
Transparency
0.69
Seeing
0.98
Cloud
66%
Moon
0%

Fair tonight

Hour by hour, local to Sivaganga. 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
48
38
39
35
36
37
36
12
0
BEST WINDOW
Low cloud
1%
1%
0%
0%
0%
1%
1%
4%
0%
Mid cloud
10%
4%
4%
11%
15%
11%
6%
3%
1%
High cloud
62%
92%
91%
95%
91%
91%
98%
95%
92%
Transparency
0.54
0.65
0.69
0.65
0.64
0.63
0.62
0.61
0.58
Seeing
0.96
0.75
0.73
0.78
0.87
0.88
0.91
0.98
0.99
Moon clear
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 · 48/100
Starting from
100
Cloud
−40
Transparency
−11
Seeing
−0
Moonlight
−0
Darkness
−0
Score
48
CLOUD 66% LOW 1% MID 10% HIGH 62% SUN -52.9° MOON -51.3° / 0% WIND 2 TEMP 29°
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
When a clear gap is worth driving for

Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.

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 22:00 · OBSERVE 22:30–01:30 · 3H · MEAN 40

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

2200020406
SET UP 22:00 · OBSERVE 22:30–01:30 · 3H · MEAN 42

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

2200020406
MOONLIGHT IGNORED FOR THIS TARGET
SET UP 22:00 · OBSERVE 22:30–23:30 · 1H · MEAN 38

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

2200020406
CLOUD RETURNS 23:30
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

2200020406
CLOUD NEVER DROPS BELOW 66%
SET UP 22:00 · OBSERVE 22:30–23:30 · 1H · MEAN 42

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

2200020406
CLOUD RETURNS 23:30
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The next week of nights

Tonight · 12 Aug
48
Fair
MOON 0%
22:30–05:30
Tomorrow · 13 Aug
74
Good
MOON 2%
20:30–05:30
Friday · 14 Aug
51
Fair
MOON 6%
20:30–22:30
Saturday · 15 Aug
39
Fair
MOON 13%
23:30–00:30
Sunday · 16 Aug
78
Excellent
MOON 21%
23:30–00:30
Monday · 17 Aug
68
Good
MOON 30%
23:30–00:30
Tuesday · 18 Aug
43
Fair
MOON 39%
23:30–00:30
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Nearby locations

About this forecast

Conditions for Sivaganga, India 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 →