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Tullinge

59.200° N   17.900° E  ·  58 M
45 /100
PEAK
Nothing usable opens up tonight.
NO USABLE WINDOW · NO ASTRO DARK · MOON 0%
Transparency
0.83
Seeing
1.00
Cloud
26%
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 Tullinge. 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
0
11
35
45
30
14
8
1
0
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
26%
31%
25%
28%
57%
82%
86%
81%
74%
High cloud
4%
1%
2%
2%
6%
7%
15%
19%
19%
Transparency
0.93
0.83
0.65
0.49
0.45
0.44
0.43
0.42
0.42
Seeing
1.00
0.99
1.00
1.00
1.00
1.00
1.00
1.00
1.00
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
21 Clouded out · 0/100
Starting from
100
Cloud
−25
Transparency
−2
Seeing
−0
Moonlight
−0
Darkness
−73
Score
0
CLOUD 29% LOW 0% MID 26% HIGH 4% SUN -2.2° MOON -0.1° / 0% WIND 1 TEMP 19°
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
Civil, nautical and astronomical twilight

Astronomical darkness begins when the sun is 18° below the horizon. Above that, there is still measurable skyglow, and faint deep-sky work is compromised even though the sky looks black.

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 39

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

2123010305
CLOUD RETURNS 01:00
SET UP 21:30 · OBSERVE 22:00–02:00 · 4H · MEAN 53

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

2123010305
CLOUD RETURNS 02:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 40

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

2123010305
CLOUD RETURNS 01:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

2123010305
NO ASTRONOMICAL DARKNESS
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 39

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

2123010305
CLOUD RETURNS 01:00
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The next week of nights

Tonight · 12 Aug
45
Fair
MOON 0%
Tomorrow · 13 Aug
43
Fair
MOON 2%
01:00–02:00
Friday · 14 Aug
34
Poor
MOON 6%
Saturday · 15 Aug
43
Fair
MOON 13%
Sunday · 16 Aug
44
Fair
MOON 21%
Monday · 17 Aug
56
Good
MOON 30%
02:00–03:00
Tuesday · 18 Aug
8
Clouded out
MOON 39%
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About this forecast

Conditions for Tullinge, Sweden 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 →