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Hitoto

36.986° N   136.903° E  ·  30 M
62 /100
PEAK
Worth setting up — 3 hours of workable sky from 01:00.
BEST WINDOW 01:00–04:00 · ASTRO DARK 01:00–04:00 · MOON 0%
Transparency
0.24
Seeing
1.00
Cloud
18%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
01
02
03
04
05
62
50
45
23
0
BEST WINDOW
Low cloud
2%
9%
20%
25%
26%
Mid cloud
0%
0%
1%
1%
3%
High cloud
16%
23%
0%
0%
0%
Transparency
0.24
0.22
0.24
0.24
0.24
Seeing
1.00
1.00
1.00
1.00
1.00
Moon clear
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
01 Good · 62/100
Starting from
100
Cloud
−11
Transparency
−27
Seeing
−0
Moonlight
−0
Darkness
−0
Score
62
CLOUD 18% LOW 2% MID 0% HIGH 16% SUN -36.0° MOON -35.1° / 0% WIND 2 TEMP 23°
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 00:30 · OBSERVE 01:00–04:00 · 3H · MEAN 52

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

010305
TWILIGHT BEGINS 04:00
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 59

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

010305
TWILIGHT BEGINS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–04:00 · 3H · MEAN 47

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

010305
TWILIGHT BEGINS 04:00
SET UP 00:30 · OBSERVE 01:00–02:00 · 1H · MEAN 45

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

010305
SET UP 00:30 · OBSERVE 01:00–04:00 · 3H · MEAN 52

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

010305
TWILIGHT BEGINS 04:00
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The next week of nights

Tonight · 12 Aug
62
Good
MOON 0%
01:00–04:00
Tomorrow · 13 Aug
75
Excellent
MOON 1%
21:00–04:00
Friday · 14 Aug
70
Good
MOON 5%
21:00–04:00
Saturday · 15 Aug
52
Fair
MOON 8%
03:00–04:00
Sunday · 16 Aug
51
Fair
MOON 19%
03:00–04:00
Monday · 17 Aug
56
Good
MOON 28%
21:00–22:00
Tuesday · 18 Aug
56
Good
MOON 37%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Hitoto, 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 →