GoodSeeing
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Hashtrūd

37.478° N   47.051° E  ·  1651 M
95 /100
PEAK
A genuinely good night — 7 hours of clear, dark sky from 21:30.
BEST WINDOW 21:30–04:30 · ASTRO DARK 21:30–04:30 · MOON 0%
Transparency
0.96
Seeing
0.95
Cloud
0%
Moon
0%

Excellent tonight

Hour by hour, local to Hashtrūd. 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
52
94
95
93
90
78
60
73
46
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
12%
1%
0%
0%
1%
11%
33%
15%
3%
4%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.94
0.96
0.91
0.88
0.83
0.77
0.71
0.72
0.73
0.71
Seeing
0.77
0.83
0.95
0.90
0.87
0.79
0.83
0.78
0.86
0.97
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 Fair · 52/100
Starting from
100
Cloud
−11
Transparency
−2
Seeing
−5
Moonlight
−0
Darkness
−30
Score
52
CLOUD 12% LOW 0% MID 12% HIGH 0% SUN -13.6° MOON -12.1° / 0% WIND 4 TEMP 22°
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
What the GoodSeeing score actually measures

One number from 0 to 100 per hour, combining cloud, transparency, seeing, moonlight and darkness. Cloud gates everything else — no amount of steady, dark air rescues an overcast sky.

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 20:00 · OBSERVE 20:30–05:30 · 9H · MEAN 75

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

2022000204
TWILIGHT BEGINS 05:30
SET UP 20:00 · OBSERVE 20:30–05:30 · 9H · MEAN 80

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

2022000204
TWILIGHT BEGINS 05:30MOONLIGHT IGNORED FOR THIS TARGET
SET UP 20:00 · OBSERVE 20:30–05:30 · 9H · MEAN 76

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

2022000204
TWILIGHT BEGINS 05:30
SET UP 20:00 · OBSERVE 20:30–05:30 · 9H · MEAN 70

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

2022000204
TWILIGHT BEGINS 05:30
SET UP 20:00 · OBSERVE 20:30–05:30 · 9H · MEAN 76

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

2022000204
TWILIGHT BEGINS 05:30
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The next week of nights

Tonight · 12 Aug
95
Excellent
MOON 0%
21:30–04:30
Tomorrow · 13 Aug
91
Excellent
MOON 2%
21:30–04:30
Friday · 14 Aug
88
Excellent
MOON 6%
21:30–04:30
Saturday · 15 Aug
97
Excellent
MOON 13%
21:30–22:30
Sunday · 16 Aug
85
Excellent
MOON 21%
21:30–22:30
Monday · 17 Aug
100
Excellent
MOON 30%
21:30–22:30
Tuesday · 18 Aug
98
Excellent
MOON 39%
21:30–22:30
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Nearby locations

About this forecast

Conditions for Hashtrūd, 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 →