Solarposition.org

Gunma · Japan · 36.43° N · 139.28° E

Solar position in Ōmamachō-ōmama

Sun position, daylight and the best solar panel angle for Ōmamachō-ōmama — computed for 36.43° N, 139.28° E, 182 m above sea level.

Sunrise today05:58104° ESE
Sunset today16:54255° WSW
Best panel angle35°year-round, facing south
Off-grid angle37°best for the darkest month

The sun right now

Azimuth180.0°
Elevation41.5°
At solar noon, 11:26Open on the sun map

Sun in Ōmamachō-ōmama today

Sunday, 25 October 2026 · local time UTC+9

EventTimeDirection / height
Astronomical dawn04:32sun 18° below horizon
Nautical dawn05:0212° below
Civil dawn05:326° below
Sunrise05:58104° ESE
Golden hour ends06:34sun 6° up
Solar noon11:2641.5° high
Golden hour starts16:19sun 6° up
Sunset16:54255° WSW
Civil dusk17:216° below
Nautical dusk17:5112° below
Astronomical dusk18:2118° below
Day length10 h 56 min

Sun path diagram for Ōmamachō-ōmama

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 77.0° at solar noon in Ōmamachō-ōmama; on the December solstice only 30.2°. 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
January06:5111:5416:5610 h 05 min33.7°
February06:2411:5617:2911 h 05 min43.0°
March05:4511:5017:5512 h 09 min53.8°
April05:0211:4118:2113 h 20 min65.4°
May04:3211:3918:4714 h 15 min73.7°
June04:2511:4419:0414 h 39 min77.0°
July04:4011:4918:5714 h 17 min74.1°
August05:0511:4618:2613 h 21 min65.7°
September05:2911:3517:4212 h 12 min54.3°
October05:5511:2716:5911 h 05 min42.9°
November06:2511:2816:3110 h 05 min33.7°
December06:5011:4016:309 h 40 min30.2°

A year of daylight in Ōmamachō-ōmama

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 Ōmamachō-ōmama

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: 1353 kWh per kWp.

37°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 37°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearOctober kWh/kWp/dayBest ÷ worst month
0°114885%2.542.3×
15°128495%2.981.7×
30°1349100%3.251.3×
35° year-round best1353100%3.301.3×
36° = latitude1353100%3.311.3×
37° off-grid best1353100%3.311.3×
45°133899%3.331.4×
60°125393%3.221.6×
70°115986%3.041.9×
90°89666%2.462.7×

A fixed array in Ōmamachō-ōmama produces the most over a year at 35°. The design month for an off-grid system is October: at 37° it makes 3.31 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.

Off-grid solar in Ōmamachō-ōmama 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: 4.13 (70°)4.1FebMarch: 3.70 (70°)3.7MarApril: 3.20 (70°)3.2AprMay: 2.73 (70°)2.7MayJune: 2.28 (70°)2.3JunJuly: 2.23 (70°)2.2JulAugust: 2.66 (70°)2.7AugSeptember: 2.74 (70°)2.7SepOctober: 3.04 (70°)3.0OctNovember: 3.54 (70°)3.5NovDecember: 3.76 (70°)3.8Dec35°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 35°Mean temp.
January snow2.564.544.143.74-1.9 °C
February snow3.284.554.134.08-1.0 °C
March4.114.143.704.282.7 °C
April4.843.683.204.288.6 °C
May5.213.232.734.1014.4 °C
June4.702.762.283.5018.6 °C
July4.512.742.233.3522.7 °C
August4.683.252.663.7123.5 °C
September3.773.292.743.3819.4 °C
October3.103.553.043.3013.1 °C
November2.604.023.543.406.9 °C
December2.284.183.763.411.1 °C
Year3.81 avg3.66 avg1159 kWh1353 kWh

Sizing example. To run a 1 kWh-per-day load through July on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 530 Wp of panels at 70°, versus 360 Wp at 35°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Ōmamachō-ōmama

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.

4.4 mrow pitch at 70°

3.9 mrow pitch at 35°

Row spacing calculator

How Ōmamachō-ōmama compares in Japan

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

742ndof 1,216 places in Japan for sunshine, shared: 3.81 peak sun hours a day on flat ground.

+5%solar energy a year compared with the average place in Japan: 1,354 against 1,284 kWh per kWp.

+4 mindaylight on the longest day, compared with Tokyo: 14 h 39 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); Ōmamachō-ōmama ranks joint 742nd. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.23 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 9 h 40 min, −4 min compared with Tokyo.

The sunniest places in Japan

Solar forecast for Ōmamachō-ōmama, 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 Ōmamachō-ōmama

What is the best solar panel angle in Ōmamachō-ōmama?
For a fixed array facing south, the best year-round tilt in Ōmamachō-ōmama is 35°, worth about 1353 kWh per kWp a year. An off-grid system that has to get through October does better at about 37°.
What time is sunrise and sunset in Ōmamachō-ōmama today?
On 25 October 2026 the sun rises at 05:58 and sets at 16:54 local time (UTC+9), giving 10 h 56 min of daylight. Solar noon is at 11:26.
How many peak sun hours does Ōmamachō-ōmama get?
On a flat surface 3.8 hours a day averaged over the year, from 2.3 in December to 5.2 in May. Panels tilted at 70° receive 2.7 sun hours a day in July.
How high does the sun get in Ōmamachō-ōmama?
At solar noon the sun stands 77.0° above the horizon on the June solstice and 30.2° on the December solstice.
Is Ōmamachō-ōmama a good place for solar panels?
With 3.8 peak sun hours a day on flat ground, Ōmamachō-ōmama ranks joint 742nd of 1,216 places in Japan for sunshine. A 1 kWp array at the best angle (35°) makes about 1,354 kWh a year here, 5% more than the average place in Japan.

Places near Ōmamachō-ōmama

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.