Solarposition.org

Ibaraki · Japan · 36.18° N · 139.97° E

Solar position in Shimo-tsuma

Sun position, daylight and the best solar panel angle for Shimo-tsuma — computed for 36.18° N, 139.97° E, 28 m above sea level.

Sunrise today05:55104° ESE
Sunset today16:52256° WSW
Best panel angle35°year-round, facing south
Off-grid angle43°best for the darkest month

The sun right now

Azimuth180.0°
Elevation41.8°
At solar noon, 11:24Open on the sun map

Sun in Shimo-tsuma today

Sunday, 25 October 2026 · local time UTC+9

EventTimeDirection / height
Astronomical dawn04:29sun 18° below horizon
Nautical dawn04:5912° below
Civil dawn05:296° below
Sunrise05:55104° ESE
Golden hour ends06:31sun 6° up
Solar noon11:2441.8° high
Golden hour starts16:16sun 6° up
Sunset16:52256° WSW
Civil dusk17:186° below
Nautical dusk17:4812° below
Astronomical dusk18:1818° below
Day length10 h 57 min

Sun path diagram for Shimo-tsuma

Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.

15°30°45°60°75°N30°60°E120°150°S210°240°W300°330°June solstice56789101112131415161718EquinoxDecember solstice78910111213141516Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 77.3° at solar noon in Shimo-tsuma; on the December solstice only 30.4°. Sunrise swings from 60° ENE in June to 119° ESE in December — a 59° arc along the horizon.

Sunrise, sunset and sun height by month

Values for the 21st of each month, local clock time including daylight saving time.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January06:4811:5116:5410 h 06 min33.9°
February06:2111:5317:2611 h 06 min43.2°
March05:4311:4717:5212 h 09 min54.0°
April04:5911:3918:1813 h 19 min65.7°
May04:2911:3618:4314 h 14 min74.0°
June04:2311:4119:0014 h 38 min77.3°
July04:3811:4618:5414 h 16 min74.3°
August05:0211:4318:2313 h 21 min66.0°
September05:2611:3317:3912 h 12 min54.6°
October05:5211:2416:5711 h 05 min43.2°
November06:2211:2516:2810 h 06 min34.0°
December06:4711:3816:289 h 42 min30.4°

A year of daylight in Shimo-tsuma

Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.

00:0003:0006:0009:0012:0015:0018:0021:0000:00JanFebMarAprMayJunJulAugSepOctNovDec

Best solar panel angle in Shimo-tsuma

Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.

35°collects the most energy over a year: 1345 kWh per kWp.

43°gives the most in the darkest month — the one an off-grid system is sized for.

40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 35°Best worst-month 43°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearOctober kWh/kWp/dayBest ÷ worst month
0°114585%2.472.2×
15°127995%2.901.6×
30°1341100%3.151.3×
35° year-round best1345100%3.201.3×
36° = latitude1345100%3.201.3×
43° off-grid best133499%3.231.3×
45°132799%3.231.3×
60°123992%3.111.6×
70°114185%2.941.8×
90°87265%2.372.7×

A fixed array in Shimo-tsuma produces the most over a year at 35°. The design month for an off-grid system is October: at 43° it makes 3.23 kWh per kWp a day, and costs 1% of the yearly total. Why steep panels win winter.

Off-grid solar in Shimo-tsuma at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 35° (year-round best).

012345January: 4.14 (70°)4.1JanFebruary: 3.87 (70°)3.9FebMarch: 3.62 (70°)3.6MarApril: 3.13 (70°)3.1AprMay: 2.67 (70°)2.7MayJune: 2.24 (70°)2.2JunJuly: 2.27 (70°)2.3JulAugust: 2.71 (70°)2.7AugSeptember: 2.76 (70°)2.8SepOctober: 2.94 (70°)2.9OctNovember: 3.40 (70°)3.4NovDecember: 3.81 (70°)3.8Dec35°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 35°Mean temp.
January2.654.594.143.831.1 °C
February3.274.323.873.972.0 °C
March4.084.093.624.195.5 °C
April4.803.633.134.2010.8 °C
May5.133.172.674.0016.1 °C
June4.682.722.243.4520.0 °C
July4.662.802.273.4423.9 °C
August4.843.332.713.8225.0 °C
September3.833.342.763.4121.2 °C
October3.053.462.943.2015.3 °C
November2.553.903.403.289.5 °C
December2.334.273.813.453.9 °C
Year3.82 avg3.63 avg1141 kWh1345 kWh

Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 530 Wp of panels at 70°, versus 370 Wp at 35°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Shimo-tsuma

Distance between rows of 2 m long panels (slope length) so that no row shades the next between 10:00 and 14:00 solar time on the winter solstice.

4.3 mrow pitch at 70°

3.9 mrow pitch at 35°

Row spacing calculator

How Shimo-tsuma compares in Japan

Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.

664thof 1,216 places in Japan for sunshine, shared: 3.82 peak sun hours a day on flat ground.

+5%solar energy a year compared with the average place in Japan: 1,345 against 1,284 kWh per kWp.

+3 mindaylight on the longest day, compared with Tokyo: 14 h 38 min against 14 h 35 min.

35°best year-round tilt here; across Japan it runs from 17° in Miyakojima to 41° in Kushiro.

Of the 1,216 places in Japan, Miyakojima gets the most sun (4.34 peak sun hours a day) and Wakkanai and one other place the least (3.17); Shimo-tsuma ranks joint 664th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 2.24 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 9 h 42 min, −3 min compared with Tokyo.

The sunniest places in Japan

Solar forecast for Shimo-tsuma, next 48 hours

Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.

Loading the latest forecast…

Questions about the sun in Shimo-tsuma

What is the best solar panel angle in Shimo-tsuma?
For a fixed array facing south, the best year-round tilt in Shimo-tsuma is 35°, worth about 1345 kWh per kWp a year. An off-grid system that has to get through October does better at about 43°.
What time is sunrise and sunset in Shimo-tsuma today?
On 25 October 2026 the sun rises at 05:55 and sets at 16:52 local time (UTC+9), giving 10 h 57 min of daylight. Solar noon is at 11:24.
How many peak sun hours does Shimo-tsuma get?
On a flat surface 3.8 hours a day averaged over the year, from 2.3 in December to 5.1 in May. Panels tilted at 70° receive 2.7 sun hours a day in June.
How high does the sun get in Shimo-tsuma?
At solar noon the sun stands 77.3° above the horizon on the June solstice and 30.4° on the December solstice.
Is Shimo-tsuma a good place for solar panels?
With 3.8 peak sun hours a day on flat ground, Shimo-tsuma ranks joint 664th of 1,216 places in Japan for sunshine. A 1 kWp array at the best angle (35°) makes about 1,345 kWh a year here, 5% more than the average place in Japan.

Places near Shimo-tsuma

All places in Japan

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Sun positions: NREL Solar Position Algorithm. Climate: NASA POWER monthly climatology (NASA Langley Research Center). Forecast: Deutscher Wetterdienst, ICON-EU (CC BY 4.0), processed. Places: GeoNames (CC BY 4.0). Time zones: IANA. Sources and licences.