GoodSeeing
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Rybinsk

58.046° N   38.838° E  ·  100 M
45 /100
PEAK
Marginal, but there is a 1 hour gap from 00:00.
BEST WINDOW 00:00–01:00 · NO ASTRO DARK · MOON 0%
Transparency
0.54
Seeing
0.57
Cloud
25%
Moon
0%
At this latitude the sun never drops 18° below the horizon tonight, so astronomical darkness never arrives. Scores reflect the deepest twilight available.

Fair tonight

Hour by hour, local to Rybinsk. 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
0
19
33
45
14
11
6
0
BEST WINDOW
Low cloud
36%
24%
31%
23%
73%
56%
55%
100%
Mid cloud
29%
13%
9%
6%
19%
45%
52%
36%
High cloud
0%
0%
0%
0%
0%
1%
1%
13%
Transparency
0.54
0.54
0.52
0.49
0.47
0.16
0.11
0.10
Seeing
0.55
0.53
0.54
0.50
0.55
0.56
0.57
0.62
Moon clear
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
21 Clouded out · 0/100
Starting from
100
Cloud
−53
Transparency
−9
Seeing
−4
Moonlight
−0
Darkness
−34
Score
0
CLOUD 48% LOW 36% MID 29% HIGH 0% SUN -5.3° MOON -3.7° / 0% WIND 7 TEMP 14°
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 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 47

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

21230103
ASTRONOMICAL DARK FROM 00:00CLOUD RETURNS 01:00
SET UP 21:30 · OBSERVE 22:00–01:00 · 3H · MEAN 42

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

21230103
CLOUD BREAKS 22:00CLOUD RETURNS 01:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 47

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

21230103
ASTRONOMICAL DARK FROM 00:00CLOUD RETURNS 01:00
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 36

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

21230103
ASTRONOMICAL DARK FROM 00:00CLOUD RETURNS 01:00
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 49

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

21230103
ASTRONOMICAL DARK FROM 00:00CLOUD RETURNS 01:00
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The next week of nights

Tonight · 12 Aug
45
Fair
MOON 0%
00:00–01:00
Tomorrow · 13 Aug
7
Clouded out
MOON 2%
Friday · 14 Aug
0
Clouded out
MOON 6%
Saturday · 15 Aug
20
Poor
MOON 13%
Sunday · 16 Aug
7
Clouded out
MOON 21%
Monday · 17 Aug
26
Poor
MOON 30%
Tuesday · 18 Aug
18
Poor
MOON 39%
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About this forecast

Conditions for Rybinsk, Russia 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 →