Tokyo · Japan · 35.73° N · 139.23° E
Solar position in Akiruno
Sun position, daylight and the best solar panel angle for Akiruno — computed for 35.73° N, 139.23° E, 163 m above sea level.
The sun right now
Sun in Akiruno today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:32 | sun 18° below horizon |
| Nautical dawn | 05:02 | 12° below |
| Civil dawn | 05:32 | 6° below |
| Sunrise | 05:58 | 104° ESE |
| Golden hour ends | 06:33 | sun 6° up |
| Solar noon | 11:26 | 42.2° high |
| Golden hour starts | 16:20 | sun 6° up |
| Sunset | 16:55 | 256° WSW |
| Civil dusk | 17:21 | 6° below |
| Nautical dusk | 17:51 | 12° below |
| Astronomical dusk | 18:21 | 18° below |
| Day length | 10 h 58 min | |
Sun path diagram for Akiruno
Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.
- June solstice
- Equinox
- December solstice
- Today
On the June solstice the sun reaches 77.7° at solar noon in Akiruno; 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.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 06:50 | 11:54 | 16:58 | 10 h 08 min | 34.4° |
| February | 06:23 | 11:56 | 17:30 | 11 h 07 min | 43.7° |
| March | 05:46 | 11:50 | 17:55 | 12 h 09 min | 54.5° |
| April | 05:03 | 11:41 | 18:20 | 13 h 18 min | 66.1° |
| May | 04:34 | 11:39 | 18:45 | 14 h 12 min | 74.4° |
| June | 04:27 | 11:44 | 19:02 | 14 h 35 min | 77.7° |
| July | 04:42 | 11:49 | 18:56 | 14 h 14 min | 74.8° |
| August | 05:06 | 11:46 | 18:25 | 13 h 20 min | 66.4° |
| September | 05:29 | 11:36 | 17:42 | 12 h 12 min | 55.0° |
| October | 05:54 | 11:27 | 17:00 | 11 h 06 min | 43.6° |
| November | 06:24 | 11:28 | 16:32 | 10 h 08 min | 34.4° |
| December | 06:48 | 11:40 | 16:33 | 9 h 44 min | 30.9° |
A year of daylight in Akiruno
Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.
Best solar panel angle in Akiruno
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: 1370 kWh per kWp.
39°gives the most in the darkest month — the one an off-grid system is sized for.
- Yearly energy
- Worst-month energy
| Tilt | kWh/kWp per year | Share of best year | October kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1163 | 85% | 2.53 | 2.1× |
| 15° | 1301 | 95% | 2.96 | 1.5× |
| 30° | 1365 | 100% | 3.22 | 1.3× |
| 35° year-round best | 1370 | 100% | 3.27 | 1.3× |
| 36° = latitude | 1370 | 100% | 3.27 | 1.3× |
| 39° off-grid best | 1367 | 100% | 3.29 | 1.3× |
| 45° | 1353 | 99% | 3.30 | 1.4× |
| 60° | 1264 | 92% | 3.18 | 1.7× |
| 70° | 1166 | 85% | 3.00 | 2.0× |
| 90° | 895 | 65% | 2.41 | 3.0× |
A fixed array in Akiruno produces the most over a year at 35°. The design month for an off-grid system is October: at 39° it makes 3.29 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Akiruno at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 35° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 35° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.75 | 4.93 | 4.46 | 4.03 | 0.1 °C |
| February | 3.35 | 4.41 | 3.97 | 4.08 | 1.3 °C |
| March | 4.13 | 4.12 | 3.65 | 4.25 | 4.8 °C |
| April | 4.84 | 3.63 | 3.14 | 4.23 | 10.2 °C |
| May | 5.17 | 3.17 | 2.67 | 4.03 | 15.5 °C |
| June | 4.60 | 2.68 | 2.20 | 3.40 | 19.4 °C |
| July | 4.67 | 2.77 | 2.25 | 3.45 | 23.4 °C |
| August | 4.87 | 3.33 | 2.71 | 3.85 | 24.4 °C |
| September | 3.85 | 3.34 | 2.77 | 3.43 | 20.5 °C |
| October | 3.11 | 3.51 | 3.00 | 3.27 | 14.5 °C |
| November | 2.64 | 4.04 | 3.54 | 3.42 | 8.6 °C |
| December | 2.43 | 4.48 | 4.01 | 3.63 | 2.9 °C |
| Year | 3.87 avg | 3.70 avg | 1166 kWh | 1370 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 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 Akiruno
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°
How Akiruno compares in Japan
Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.
355thof 1,216 places in Japan for sunshine, shared: 3.87 peak sun hours a day on flat ground.
+7%solar energy a year compared with the average place in Japan: 1,370 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); Akiruno ranks joint 355th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 2.20 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.
Solar forecast for Akiruno, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
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Questions about the sun in Akiruno
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Places near Akiruno
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A free, live card for Akiruno: where the sun is right now on today's path, a countdown to sunset or sunrise, the daylight change, the moon phase at night and the best panel angle.
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.