GoodSeeing
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Políchni

40.667° N   22.949° E  ·  109 M
92 /100
PEAK
A genuinely good night — 7 hours of clear, dark sky from 23:00.
BEST WINDOW 23:00–06:00 · ASTRO DARK 23:00–05:00 · MOON 0%
Transparency
0.80
Seeing
1.00
Cloud
0%
Moon
0%

Excellent tonight

Hour by hour, local to Políchni. 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
06
07
0
73
91
92
89
79
79
87
75
8
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
5%
4%
2%
2%
2%
2%
Mid cloud
0%
1%
1%
0%
0%
0%
0%
0%
2%
2%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.86
0.79
0.79
0.80
0.73
0.66
0.68
0.78
0.72
0.62
0.56
Seeing
0.95
1.00
1.00
1.00
1.00
0.98
0.93
0.95
0.97
1.00
1.00
Moon clear
down
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
21 Clouded out · 0/100
Starting from
100
Cloud
−0
Transparency
−6
Seeing
−1
Moonlight
−0
Darkness
−93
Score
0
CLOUD 0% LOW 0% MID 0% HIGH 0% SUN -5.8° MOON -3.9° / 0% WIND 3 TEMP 29°
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 21:30 · OBSERVE 22:00–06:00 · 8H · MEAN 82

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

212301030507
TWILIGHT BEGINS 06:00
SET UP 21:30 · OBSERVE 22:00–07:00 · 9H · MEAN 86

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

212301030507
TWILIGHT BEGINS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 21:30 · OBSERVE 22:00–06:00 · 8H · MEAN 81

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

212301030507
TWILIGHT BEGINS 06:00
SET UP 21:30 · OBSERVE 22:00–06:00 · 8H · MEAN 76

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

212301030507
TWILIGHT BEGINS 06:00
SET UP 21:30 · OBSERVE 22:00–06:00 · 8H · MEAN 84

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

212301030507
TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
92
Excellent
MOON 0%
23:00–06:00
Tomorrow · 13 Aug
75
Excellent
MOON 2%
23:00–04:00
Friday · 14 Aug
66
Good
MOON 6%
23:00–06:00
Saturday · 15 Aug
86
Excellent
MOON 13%
03:00–04:00
Sunday · 16 Aug
75
Excellent
MOON 21%
03:00–04:00
Monday · 17 Aug
75
Excellent
MOON 30%
03:00–04:00
Tuesday · 18 Aug
76
Excellent
MOON 39%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Políchni, Greece 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 →