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Sīāhkal

37.153° N   49.871° E  ·  47 M
61 /100
PEAK
Worth setting up — 4 hours of workable sky from 00:30.
BEST WINDOW 00:30–04:30 · ASTRO DARK 21:30–04:30 · MOON 0%
Transparency
0.60
Seeing
1.00
Cloud
29%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
20
21
22
23
00
01
02
03
04
05
34
23
13
17
35
61
47
49
23
0
BEST WINDOW
Low cloud
5%
4%
2%
0%
0%
0%
0%
0%
1%
0%
Mid cloud
30%
41%
70%
60%
54%
23%
19%
16%
9%
6%
High cloud
52%
99%
99%
99%
28%
8%
52%
51%
38%
28%
Transparency
0.60
0.54
0.55
0.53
0.53
0.51
0.49
0.49
0.49
0.47
Seeing
1.00
1.00
1.00
1.00
1.00
1.00
0.99
0.99
0.98
1.00
Moon clear
down
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
20 Poor · 34/100
Starting from
100
Cloud
−50
Transparency
−8
Seeing
−0
Moonlight
−0
Darkness
−8
Score
34
CLOUD 61% LOW 5% MID 30% HIGH 52% SUN -15.6° MOON -14.2° / 0% WIND 1 TEMP 28°
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 01:00 · OBSERVE 01:30–04:30 · 3H · MEAN 51

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

2022000204
HIGH CLOUD CLEARS 01:30TWILIGHT BEGINS 04:30
SET UP 00:00 · OBSERVE 00:30–05:30 · 5H · MEAN 53

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

2022000204
HIGH CLOUD CLEARS 00:30TWILIGHT BEGINS 05:30MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:00 · OBSERVE 01:30–04:30 · 3H · MEAN 45

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

2022000204
HIGH CLOUD CLEARS 01:30TWILIGHT BEGINS 04:30
SET UP 01:00 · OBSERVE 01:30–02:30 · 1H · MEAN 47

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

2022000204
HIGH CLOUD CLEARS 01:30CLOUD RETURNS 02:30
SET UP 01:00 · OBSERVE 01:30–04:30 · 3H · MEAN 49

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

2022000204
HIGH CLOUD CLEARS 01:30TWILIGHT BEGINS 04:30
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The next week of nights

Tonight · 12 Aug
61
Good
MOON 0%
00:30–04:30
Tomorrow · 13 Aug
59
Good
MOON 2%
22:30–03:30
Friday · 14 Aug
0
Clouded out
MOON 6%
Saturday · 15 Aug
1
Clouded out
MOON 13%
Sunday · 16 Aug
46
Fair
MOON 21%
03:30–04:30
Monday · 17 Aug
67
Good
MOON 30%
03:30–04:30
Tuesday · 18 Aug
82
Excellent
MOON 39%
21:30–22:30
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Nearby locations

About this forecast

Conditions for Sīāhkal, Iran 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 →