Solarposition.org

Tokyo · Japan · 35.72° N · 139.58° E

Solar position in Sekimachi-minami

Sun position, daylight and the best solar panel angle for Sekimachi-minami — computed for 35.72° N, 139.58° E, 56 m above sea level.

Sunrise today05:56104° ESE
Sunset today16:54256° WSW
Best panel angle35°year-round, facing south
Off-grid angle40°best for the darkest month

The sun right now

Azimuth180.0°
Elevation42.2°
At solar noon, 11:25Open on the sun map

Sun in Sekimachi-minami today

Sunday, 25 October 2026 · local time UTC+9

EventTimeDirection / height
Astronomical dawn04:31sun 18° below horizon
Nautical dawn05:0012° below
Civil dawn05:306° below
Sunrise05:56104° ESE
Golden hour ends06:31sun 6° up
Solar noon11:2542.2° high
Golden hour starts16:19sun 6° up
Sunset16:54256° WSW
Civil dusk17:206° below
Nautical dusk17:5012° below
Astronomical dusk18:1918° below
Day length10 h 58 min

Sun path diagram for Sekimachi-minami

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 77.7° at solar noon in Sekimachi-minami; on the December solstice only 30.9°. 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
January06:4811:5316:5710 h 08 min34.4°
February06:2211:5517:2811 h 07 min43.7°
March05:4411:4917:5312 h 09 min54.5°
April05:0111:4018:1913 h 18 min66.1°
May04:3211:3818:4414 h 12 min74.4°
June04:2511:4319:0014 h 35 min77.7°
July04:4111:4818:5414 h 14 min74.8°
August05:0411:4418:2413 h 20 min66.4°
September05:2811:3417:4012 h 12 min55.0°
October05:5311:2616:5911 h 06 min43.6°
November06:2311:2716:3110 h 08 min34.4°
December06:4711:3916:319 h 44 min30.9°

A year of daylight in Sekimachi-minami

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 Sekimachi-minami

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: 1358 kWh per kWp.

40°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 40°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearOctober kWh/kWp/dayBest ÷ worst month
0°115585%2.482.1×
15°129195%2.901.6×
30°1354100%3.161.3×
35° year-round best1358100%3.201.3×
36° = latitude1357100%3.211.3×
40° off-grid best1353100%3.231.3×
45°134099%3.231.4×
60°124992%3.111.7×
70°115185%2.932.0×
90°87865%2.362.8×

A fixed array in Sekimachi-minami produces the most over a year at 35°. The design month for an off-grid system is October: at 40° it makes 3.23 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.

Off-grid solar in Sekimachi-minami at 70°

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

012345January: 4.30 (70°)4.3JanFebruary: 3.92 (70°)3.9FebMarch: 3.61 (70°)3.6MarApril: 3.11 (70°)3.1AprMay: 2.64 (70°)2.6MayJune: 2.18 (70°)2.2JunJuly: 2.26 (70°)2.3JulAugust: 2.73 (70°)2.7AugSeptember: 2.76 (70°)2.8SepOctober: 2.93 (70°)2.9OctNovember: 3.44 (70°)3.4NovDecember: 3.97 (70°)4.0Dec35°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 35°Mean temp.
January2.754.784.303.981.7 °C
February3.324.383.924.022.7 °C
March4.104.103.614.206.2 °C
April4.823.623.114.1911.5 °C
May5.133.152.643.9816.6 °C
June4.592.662.183.3820.4 °C
July4.722.792.263.4724.4 °C
August4.933.362.733.8825.4 °C
September3.853.342.763.4221.7 °C
October3.063.462.933.2015.7 °C
November2.603.953.443.3310.0 °C
December2.424.463.973.604.3 °C
Year3.86 avg3.67 avg1151 kWh1358 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 540 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 Sekimachi-minami

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°

3.8 mrow pitch at 35°

Row spacing calculator

How Sekimachi-minami compares in Japan

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

396thof 1,216 places in Japan for sunshine, shared: 3.86 peak sun hours a day on flat ground.

+6%solar energy a year compared with the average place in Japan: 1,358 against 1,284 kWh per kWp.

±0 mindaylight on the longest day, compared with Tokyo: 14 h 35 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); Sekimachi-minami ranks joint 396th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 2.19 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 9 h 44 min, ±0 min compared with Tokyo.

The sunniest places in Japan

Solar forecast for Sekimachi-minami, 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 Sekimachi-minami

What is the best solar panel angle in Sekimachi-minami?
For a fixed array facing south, the best year-round tilt in Sekimachi-minami is 35°, worth about 1358 kWh per kWp a year. An off-grid system that has to get through October does better at about 40°.
What time is sunrise and sunset in Sekimachi-minami today?
On 25 October 2026 the sun rises at 05:56 and sets at 16:54 local time (UTC+9), giving 10 h 58 min of daylight. Solar noon is at 11:25.
How many peak sun hours does Sekimachi-minami get?
On a flat surface 3.9 hours a day averaged over the year, from 2.4 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 Sekimachi-minami?
At solar noon the sun stands 77.7° above the horizon on the June solstice and 30.9° on the December solstice.
Is Sekimachi-minami a good place for solar panels?
With 3.9 peak sun hours a day on flat ground, Sekimachi-minami ranks joint 396th of 1,216 places in Japan for sunshine. A 1 kWp array at the best angle (35°) makes about 1,358 kWh a year here, 6% more than the average place in Japan.

Places near Sekimachi-minami

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.