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Koch Bihār

26.325° N   89.445° E  ·  47 M
57 /100
PEAK
Worth setting up — 1 hour of workable sky from 03:30.
BEST WINDOW 03:30–04:30 · ASTRO DARK 21:30–04:30 · MOON 0%
Transparency
0.28
Seeing
1.00
Cloud
22%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
21
22
23
00
01
02
03
04
05
38
32
33
29
32
33
57
6
0
BEST WINDOW
Low cloud
0%
0%
1%
6%
11%
13%
10%
7%
32%
Mid cloud
6%
13%
5%
9%
2%
4%
2%
1%
17%
High cloud
79%
88%
91%
92%
82%
79%
11%
59%
43%
Transparency
0.28
0.25
0.23
0.23
0.22
0.23
0.23
0.10
0.10
Seeing
0.99
1.00
0.98
0.94
0.93
0.96
0.97
1.00
1.00
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
21 Fair · 38/100
Starting from
100
Cloud
−46
Transparency
−15
Seeing
−0
Moonlight
−0
Darkness
−0
Score
38
CLOUD 81% LOW 0% MID 6% HIGH 79% SUN -38.4° MOON -37.0° / 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.

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 03:00 · OBSERVE 03:30–04:30 · 1H · MEAN 57

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

2123010305
HIGH CLOUD CLEARS 03:30CLOUD RETURNS 04:30
SET UP 01:00 · OBSERVE 01:30–04:30 · 3H · MEAN 49

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

2123010305
CLOUD RETURNS 04:30MOONLIGHT IGNORED FOR THIS TARGET
SET UP 03:00 · OBSERVE 03:30–04:30 · 1H · MEAN 51

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

2123010305
HIGH CLOUD CLEARS 03:30CLOUD RETURNS 04:30
SET UP 03:00 · OBSERVE 03:30–04:30 · 1H · MEAN 41

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

2123010305
HIGH CLOUD CLEARS 03:30CLOUD RETURNS 04:30
SET UP 03:00 · OBSERVE 03:30–04:30 · 1H · MEAN 59

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

2123010305
HIGH CLOUD CLEARS 03:30CLOUD RETURNS 04:30
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The next week of nights

Tonight · 12 Aug
57
Good
MOON 0%
03:30–04:30
Tomorrow · 13 Aug
37
Fair
MOON 2%
01:30–02:30
Friday · 14 Aug
32
Poor
MOON 6%
Saturday · 15 Aug
22
Poor
MOON 13%
Sunday · 16 Aug
0
Clouded out
MOON 21%
Monday · 17 Aug
0
Clouded out
MOON 30%
Tuesday · 18 Aug
0
Clouded out
MOON 39%
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About this forecast

Conditions for Koch Bihār, 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 →