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Tsuha

26.657° N   128.094° E  ·  9 M
56 /100
PEAK
Worth setting up — 2 hours of workable sky from 03:00.
BEST WINDOW 03:00–05:00 · ASTRO DARK 03:00–05:00 · MOON 0%
Transparency
0.25
Seeing
1.00
Cloud
10%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
03
04
05
06
48
56
36
0
BEST WINDOW
Low cloud
22%
16%
7%
2%
Mid cloud
0%
2%
0%
0%
High cloud
23%
6%
3%
23%
Transparency
0.25
0.25
0.24
0.24
Seeing
0.98
1.00
0.89
0.79
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
03 Fair · 48/100
Starting from
100
Cloud
−32
Transparency
−20
Seeing
−0
Moonlight
−0
Darkness
−0
Score
48
CLOUD 40% LOW 22% MID 0% HIGH 23% SUN -35.2° MOON -35.7° / 0% WIND 2 TEMP 26°
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
Conditions for planets and the Moon

Seeing is everything. Darkness and moonlight barely matter, and a hazy, humid night that ruins deep-sky work is often the steadiest night of the year for planetary detail.

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 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 51

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

0305
TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 64

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

0305
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 47

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

0305
TWILIGHT BEGINS 05:00
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 40

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

0305
HIGH CLOUD CLEARS 04:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 52

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

0305
TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
56
Good
MOON 0%
03:00–05:00
Tomorrow · 13 Aug
45
Fair
MOON 1%
21:00–03:00
Friday · 14 Aug
51
Fair
MOON 5%
23:00–03:00
Saturday · 15 Aug
37
Fair
MOON 8%
21:00–22:00
Sunday · 16 Aug
31
Poor
MOON 19%
Monday · 17 Aug
52
Fair
MOON 28%
21:00–22:00
Tuesday · 18 Aug
44
Fair
MOON 37%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Tsuha, 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 →