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Sakaki

36.467° N   138.183° E  ·  416 M
45 /100
PEAK
Marginal, but there is a 2 hours gap from 02:00.
BEST WINDOW 02:00–04:00 · ASTRO DARK 02:00–04:00 · MOON 0%
Transparency
0.26
Seeing
1.00
Cloud
33%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
02
03
04
05
45
35
16
0
BEST WINDOW
Low cloud
33%
36%
37%
36%
Mid cloud
1%
1%
1%
0%
High cloud
0%
27%
51%
85%
Transparency
0.26
0.23
0.21
0.21
Seeing
1.00
0.99
0.98
1.00
Moon clear
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
02 Fair · 45/100
Starting from
100
Cloud
−36
Transparency
−19
Seeing
−0
Moonlight
−0
Darkness
−0
Score
45
CLOUD 33% LOW 33% MID 1% HIGH 0% SUN -30.4° MOON -30.2° / 0% WIND 2 TEMP 20°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

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 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 45

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

0204
CLOUD RETURNS 03:00
SET UP 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 49

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

0204
CLOUD RETURNS 04:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 42

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

0204
CLOUD RETURNS 03:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

0204
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 44

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

0204
CLOUD RETURNS 03:00
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The next week of nights

Tonight · 12 Aug
45
Fair
MOON 0%
02:00–04:00
Tomorrow · 13 Aug
54
Fair
MOON 1%
21:00–22:00
Friday · 14 Aug
39
Fair
MOON 5%
23:00–01:00
Saturday · 15 Aug
60
Good
MOON 8%
21:00–22:00
Sunday · 16 Aug
35
Fair
MOON 19%
21:00–22:00
Monday · 17 Aug
28
Poor
MOON 28%
Tuesday · 18 Aug
52
Fair
MOON 37%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Sakaki, Japan 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 →