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Rameswaram

9.289° N   79.313° E  ·  10 M
41 /100
PEAK
Marginal, but there is a 3 hours gap from 22:30.
BEST WINDOW 22:30–01:30 · ASTRO DARK 22:30–05:30 · MOON 0%
Transparency
0.46
Seeing
0.34
Cloud
58%
Moon
0%

Fair tonight

Hour by hour, local to Rameswaram. 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
36
41
37
30
23
23
29
7
0
BEST WINDOW
Low cloud
0%
0%
0%
1%
0%
2%
6%
6%
6%
Mid cloud
0%
1%
7%
0%
22%
23%
9%
9%
2%
High cloud
67%
58%
66%
88%
95%
94%
84%
94%
85%
Transparency
0.33
0.42
0.46
0.34
0.33
0.35
0.37
0.38
0.38
Seeing
0.15
0.17
0.15
0.18
0.20
0.25
0.29
0.34
0.37
Moon clear
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
22 Fair · 36/100
Starting from
100
Cloud
−37
Transparency
−17
Seeing
−10
Moonlight
−0
Darkness
−0
Score
36
CLOUD 68% LOW 0% MID 0% HIGH 67% SUN -53.9° MOON -52.3° / 0% WIND 11 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 41

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

2200020406
CLOUD RETURNS 01:30
SET UP 23:00 · OBSERVE 23:30–00:30 · 1H · MEAN 35

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

2200020406
SEEING STAYS SOFT THROUGHOUTMOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:00 · OBSERVE 23:30–00:30 · 1H · MEAN 39

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

2200020406
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 58%
SET UP 22:00 · OBSERVE 22:30–01:30 · 3H · MEAN 43

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

2200020406
CLOUD RETURNS 01:30
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The next week of nights

Tonight · 12 Aug
41
Fair
MOON 0%
22:30–01:30
Tomorrow · 13 Aug
58
Good
MOON 2%
20:30–05:30
Friday · 14 Aug
39
Fair
MOON 6%
20:30–21:30
Saturday · 15 Aug
45
Fair
MOON 13%
23:30–00:30
Sunday · 16 Aug
53
Fair
MOON 21%
23:30–00:30
Monday · 17 Aug
36
Fair
MOON 30%
23:30–00:30
Tuesday · 18 Aug
47
Fair
MOON 39%
23:30–00:30
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Nearby locations

About this forecast

Conditions for Rameswaram, 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 →