Saitama · Japan · 36.10° N · 139.66° E
Solar position in Washinomiya
Sun position, daylight and the best solar panel angle for Washinomiya — computed for 36.10° N, 139.66° E, 11 m above sea level.
The sun right now
Sun in Washinomiya today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:30 | sun 18° below horizon |
| Nautical dawn | 05:00 | 12° below |
| Civil dawn | 05:30 | 6° below |
| Sunrise | 05:56 | 104° ESE |
| Golden hour ends | 06:32 | sun 6° up |
| Solar noon | 11:25 | 41.9° high |
| Golden hour starts | 16:18 | sun 6° up |
| Sunset | 16:53 | 256° WSW |
| Civil dusk | 17:19 | 6° below |
| Nautical dusk | 17:49 | 12° below |
| Astronomical dusk | 18:19 | 18° below |
| Day length | 10 h 57 min | |
Sun path diagram for Washinomiya
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 77.3° at solar noon in Washinomiya; on the December solstice only 30.5°. 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 | 06:49 | 11:52 | 16:55 | 10 h 07 min | 34.0° |
| February | 06:22 | 11:55 | 17:28 | 11 h 06 min | 43.3° |
| March | 05:44 | 11:48 | 17:53 | 12 h 09 min | 54.1° |
| April | 05:01 | 11:40 | 18:19 | 13 h 19 min | 65.7° |
| May | 04:31 | 11:37 | 18:44 | 14 h 13 min | 74.1° |
| June | 04:24 | 11:43 | 19:01 | 14 h 37 min | 77.3° |
| July | 04:39 | 11:47 | 18:55 | 14 h 16 min | 74.4° |
| August | 05:04 | 11:44 | 18:24 | 13 h 21 min | 66.0° |
| September | 05:28 | 11:34 | 17:40 | 12 h 12 min | 54.6° |
| October | 05:53 | 11:25 | 16:58 | 11 h 05 min | 43.3° |
| November | 06:23 | 11:26 | 16:30 | 10 h 07 min | 34.0° |
| December | 06:48 | 11:39 | 16:30 | 9 h 42 min | 30.5° |
A year of daylight in Washinomiya
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 Washinomiya
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: 1355 kWh per kWp.
41°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° | 1149 | 85% | 2.49 | 2.2× |
| 15° | 1286 | 95% | 2.92 | 1.6× |
| 30° | 1350 | 100% | 3.18 | 1.3× |
| 35° year-round best | 1355 | 100% | 3.23 | 1.3× |
| 36° = latitude | 1355 | 100% | 3.23 | 1.3× |
| 41° off-grid best | 1349 | 100% | 3.25 | 1.3× |
| 45° | 1339 | 99% | 3.26 | 1.3× |
| 60° | 1252 | 92% | 3.14 | 1.7× |
| 70° | 1155 | 85% | 2.97 | 2.0× |
| 90° | 887 | 66% | 2.39 | 2.9× |
A fixed array in Washinomiya produces the most over a year at 35°. The design month for an off-grid system is October: at 41° it makes 3.25 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Washinomiya 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 | 2.68 | 4.82 | 4.35 | 3.92 | 0.4 °C |
| February | 3.31 | 4.38 | 3.94 | 4.04 | 1.4 °C |
| March | 4.11 | 4.13 | 3.66 | 4.24 | 5.0 °C |
| April | 4.82 | 3.64 | 3.15 | 4.22 | 10.4 °C |
| May | 5.15 | 3.18 | 2.67 | 4.02 | 15.9 °C |
| June | 4.64 | 2.71 | 2.22 | 3.43 | 19.8 °C |
| July | 4.62 | 2.77 | 2.25 | 3.41 | 23.8 °C |
| August | 4.81 | 3.31 | 2.70 | 3.80 | 24.8 °C |
| September | 3.81 | 3.32 | 2.75 | 3.40 | 20.9 °C |
| October | 3.07 | 3.48 | 2.97 | 3.23 | 14.8 °C |
| November | 2.59 | 3.97 | 3.47 | 3.35 | 8.9 °C |
| December | 2.36 | 4.36 | 3.90 | 3.52 | 3.2 °C |
| Year | 3.83 avg | 3.67 avg | 1155 kWh | 1355 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 Washinomiya
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°
How Washinomiya compares in Japan
Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.
599thof 1,216 places in Japan for sunshine, shared: 3.83 peak sun hours a day on flat ground.
+6%solar energy a year compared with the average place in Japan: 1,355 against 1,284 kWh per kWp.
+2 mindaylight on the longest day, compared with Tokyo: 14 h 37 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); Washinomiya ranks joint 599th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 2.22 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 9 h 42 min, −2 min compared with Tokyo.
Solar forecast for Washinomiya, 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 Washinomiya
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Places near Washinomiya
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A free, live card for Washinomiya: 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.