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Tsuchiura

36.090° N   140.210° E  ·  5 M
29 /100
PEAK
Nothing usable opens up tonight.
NO USABLE WINDOW · ASTRO DARK 02:00–04:00 · MOON 0%
Transparency
0.10
Seeing
0.98
Cloud
74%
Moon
0%

Poor tonight

Hour by hour, local to Tsuchiura. 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
19
29
7
0
Low cloud
23%
31%
72%
100%
Mid cloud
17%
1%
5%
32%
High cloud
93%
63%
9%
81%
Transparency
0.10
0.10
0.10
0.10
Seeing
0.69
0.98
0.91
0.89
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 Poor · 19/100
Starting from
100
Cloud
−68
Transparency
−11
Seeing
−2
Moonlight
−0
Darkness
−0
Score
19
CLOUD 95% LOW 23% MID 17% HIGH 93% SUN -29.8° MOON -29.6° / 0% WIND 5 TEMP 22°
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.

NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

0204
CLOUD NEVER DROPS BELOW 74%
SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 36

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

0204
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 04:00MOONLIGHT IGNORED FOR THIS TARGET
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

0204
CLOUD NEVER DROPS BELOW 74%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

0204
CLOUD NEVER DROPS BELOW 74%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

0204
CLOUD NEVER DROPS BELOW 74%
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The next week of nights

Tonight · 12 Aug
29
Poor
MOON 0%
Tomorrow · 13 Aug
29
Poor
MOON 1%
Friday · 14 Aug
49
Fair
MOON 5%
20:00–23:00
Saturday · 15 Aug
59
Good
MOON 8%
03:00–04:00
Sunday · 16 Aug
57
Good
MOON 19%
03:00–04:00
Monday · 17 Aug
39
Fair
MOON 28%
21:00–22:00
Tuesday · 18 Aug
2
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for Tsuchiura, 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 →