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Reẕvānshahr

37.550° N   49.137° E  ·  15 M
65 /100
PEAK
Worth setting up — 2 hours of workable sky from 00:30.
BEST WINDOW 00:30–02:30 · ASTRO DARK 21:30–04:30 · MOON 0%
Transparency
0.62
Seeing
1.00
Cloud
18%
Moon
0%

Good tonight

Hour by hour, local to Reẕvānshahr. 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
24
51
13
47
41
13
65
26
0
BEST WINDOW
Low cloud
37%
14%
9%
6%
1%
1%
0%
2%
6%
3%
Mid cloud
4%
49%
29%
77%
20%
8%
71%
15%
18%
9%
High cloud
20%
70%
10%
77%
49%
76%
95%
3%
6%
3%
Transparency
0.62
0.58
0.53
0.50
0.47
0.43
0.45
0.46
0.45
0.44
Seeing
1.00
0.97
0.94
1.00
1.00
0.99
0.99
0.97
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
−45
Transparency
−8
Seeing
−0
Moonlight
−0
Darkness
−12
Score
34
CLOUD 48% LOW 37% MID 4% HIGH 20% SUN -14.9° MOON -13.5° / 0% WIND 2 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
Why thin high cloud ruins long exposures

Cirrus you can barely see will halo your bright stars, lift your background and vary between frames. Visual observers shrug it off. Long exposures integrate it, so it accumulates.

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 00:00 · OBSERVE 00:30–02:30 · 2H · MEAN 42

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

2022000204
HIGH CLOUD CLEARS 00:30CLOUD RETURNS 02:30
SET UP 03:00 · OBSERVE 03:30–05:30 · 2H · MEAN 66

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

2022000204
HIGH CLOUD CLEARS 03:30TWILIGHT BEGINS 05:30MOONLIGHT IGNORED FOR THIS TARGET
SET UP 03:00 · OBSERVE 03:30–04:30 · 1H · MEAN 62

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

2022000204
HIGH CLOUD CLEARS 03:30TWILIGHT BEGINS 04:30
SET UP 03:00 · OBSERVE 03:30–04:30 · 1H · MEAN 52

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

2022000204
HIGH CLOUD CLEARS 03:30TWILIGHT BEGINS 04:30
SET UP 00:00 · OBSERVE 00:30–02:30 · 2H · MEAN 39

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

2022000204
HIGH CLOUD CLEARS 00:30CLOUD RETURNS 02:30
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The next week of nights

Tonight · 12 Aug
65
Good
MOON 0%
00:30–02:30
Tomorrow · 13 Aug
65
Good
MOON 2%
22:30–04:30
Friday · 14 Aug
51
Fair
MOON 6%
22:30–23:30
Saturday · 15 Aug
1
Clouded out
MOON 13%
Sunday · 16 Aug
0
Clouded out
MOON 21%
Monday · 17 Aug
79
Excellent
MOON 30%
21:30–22:30
Tuesday · 18 Aug
85
Excellent
MOON 39%
21:30–22:30
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Nearby locations

About this forecast

Conditions for Reẕvānshahr, 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 →