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Hōjō

33.977° N   132.778° E  ·  7 M
60 /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
0.32
Seeing
1.00
Cloud
18%
Moon
0%

Good tonight

Hour by hour, local to Hōjō. 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
06
49
59
60
34
1
0
BEST WINDOW
Low cloud
12%
10%
5%
16%
25%
6%
Mid cloud
22%
9%
14%
46%
63%
48%
High cloud
0%
0%
0%
0%
0%
0%
Transparency
0.27
0.29
0.32
0.31
0.29
0.34
Seeing
0.92
0.98
0.98
1.00
0.83
0.77
Moon clear
down
down
down
down
down
0%
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 Fair · 49/100
Starting from
100
Cloud
−29
Transparency
−21
Seeing
−1
Moonlight
−0
Darkness
−0
Score
49
CLOUD 31% LOW 12% MID 22% HIGH 0% SUN -39.9° MOON -38.9° / 0% WIND 3 TEMP 25°
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 56

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

010305
CLOUD RETURNS 04:00
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 61

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

010305
CLOUD RETURNS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–04:00 · 3H · MEAN 53

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

010305
CLOUD RETURNS 04:00
SET UP 00:30 · OBSERVE 01:00–04:00 · 3H · MEAN 42

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

010305
CLOUD RETURNS 04:00
SET UP 00:30 · OBSERVE 01:00–04:00 · 3H · MEAN 58

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

010305
CLOUD RETURNS 04:00
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The next week of nights

Tonight · 12 Aug
60
Good
MOON 0%
01:00–04:00
Tomorrow · 13 Aug
58
Good
MOON 1%
02:00–05:00
Friday · 14 Aug
20
Poor
MOON 5%
Saturday · 15 Aug
30
Poor
MOON 8%
Sunday · 16 Aug
43
Fair
MOON 19%
03:00–04:00
Monday · 17 Aug
30
Poor
MOON 28%
Tuesday · 18 Aug
37
Fair
MOON 37%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Hōjō, 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 →