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Lanka

25.929° N   92.949° E  ·  64 M
52 /100
PEAK
Marginal, but there is a 5 hours gap from 23:30.
BEST WINDOW 23:30–04:30 · ASTRO DARK 22:30–03:30 · MOON 0%
Transparency
0.28
Seeing
1.00
Cloud
39%
Moon
0%

Fair tonight

Hour by hour, local to Lanka. 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
31
45
47
52
47
36
0
BEST WINDOW
Low cloud
2%
10%
6%
2%
2%
8%
16%
Mid cloud
15%
12%
16%
7%
11%
23%
28%
High cloud
86%
38%
31%
34%
45%
48%
16%
Transparency
0.26
0.26
0.25
0.26
0.27
0.28
0.10
Seeing
1.00
1.00
1.00
1.00
1.00
0.96
1.00
Moon clear
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 Poor · 31/100
Starting from
100
Cloud
−55
Transparency
−13
Seeing
−0
Moonlight
−0
Darkness
−0
Score
31
CLOUD 88% LOW 2% MID 15% HIGH 86% SUN -47.1° MOON -45.8° / 0% WIND 1 TEMP 29°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

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 23:00 · OBSERVE 23:30–03:30 · 4H · MEAN 46

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

22000204
HIGH CLOUD CLEARS 23:30
SET UP 22:00 · OBSERVE 22:30–04:30 · 6H · MEAN 52

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

22000204
TWILIGHT BEGINS 04:30MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:00 · OBSERVE 23:30–03:30 · 4H · MEAN 40

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

22000204
HIGH CLOUD CLEARS 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.

22000204
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 23:00 · OBSERVE 23:30–03:30 · 4H · MEAN 46

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

22000204
HIGH CLOUD CLEARS 23:30
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The next week of nights

Tonight · 12 Aug
52
Fair
MOON 0%
23:30–04:30
Tomorrow · 13 Aug
45
Fair
MOON 2%
19:30–21:30
Friday · 14 Aug
37
Fair
MOON 6%
21:30–22:30
Saturday · 15 Aug
27
Poor
MOON 13%
Sunday · 16 Aug
22
Poor
MOON 21%
Monday · 17 Aug
24
Poor
MOON 30%
Tuesday · 18 Aug
24
Poor
MOON 39%
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Nearby locations

About this forecast

Conditions for Lanka, 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 →