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Yasugichō

35.422° N 133.242° E · 2 M

63 /100
PEAK

Worth setting up — 3 hours of workable sky from 02:00.

BEST WINDOW 02:00–05:00 · ASTRO DARK 02:00–04:00 · MOON 0%

Transparency

0.38

Seeing

0.89

Cloud

13%

Moon

Good tonight

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

Sky state

Lighter = daylight and twilight · unshaded = astronomical dark

Score

BEST WINDOW

Low cloud

23%

14%

Mid cloud

14%

12%

High cloud

Transparency

0.37

0.38

0.36

Seeing

0.87

0.85

0.89

Moon clear

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 Good · 63/100

Starting from

100

Cloud

−13

Transparency

−22

Seeing

−2

Moonlight

−0

Darkness

−0

Score

CLOUD 13% LOW 6% MID 8% HIGH 0% SUN -33.5° MOON -33.2° / 0% WIND 3 TEMP 24°

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.

Deep-sky visualPlanetary & lunarWide-field imagingLong exposureMeteor watching

SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 55

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

0204

TWILIGHT BEGINS 05:00

SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 65

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

0204

TWILIGHT BEGINS 05:00MOONLIGHT IGNORED FOR THIS TARGET

SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 53

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

0204

TWILIGHT BEGINS 05:00

SET UP 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 50

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

0204

CLOUD RETURNS 04:00

SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 57

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

0204

TWILIGHT BEGINS 05:00

The next week of nights

Tonight · 12 Aug

Good

MOON 0%
02:00–05:00

Tomorrow · 13 Aug

Good

MOON 1%
21:00–04:00

Friday · 14 Aug

Fair

MOON 5%
03:00–04:00

Saturday · 15 Aug

Poor

MOON 8%

Sunday · 16 Aug

Fair

MOON 19%
21:00–22:00

Monday · 17 Aug

Poor

MOON 28%

Tuesday · 18 Aug

Poor

MOON 37%

Nearby locations

About this forecast

Conditions for Yasugichō, 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 →