Hokkaido · Japan · 43.20° N · 140.77° E
Solar position in Yoichi
Sun position, daylight and the best solar panel angle for Yoichi — computed for 43.20° N, 140.77° E, 2 m above sea level.
The sun right now
Sun in Yoichi today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:26 | sun 18° below horizon |
| Nautical dawn | 04:59 | 12° below |
| Civil dawn | 05:33 | 6° below |
| Sunrise | 06:02 | 106° ESE |
| Golden hour ends | 06:42 | sun 6° up |
| Solar noon | 11:20 | 34.8° high |
| Golden hour starts | 15:59 | sun 6° up |
| Sunset | 16:39 | 254° WSW |
| Civil dusk | 17:08 | 6° below |
| Nautical dusk | 17:41 | 12° below |
| Astronomical dusk | 18:14 | 18° below |
| Day length | 10 h 37 min | |
Sun path diagram for Yoichi
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 70.2° at solar noon in Yoichi; on the December solstice only 23.4°. Sunrise swings from 56° NE in June to 122° ESE in December — a 66° 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 | 07:02 | 11:48 | 16:33 | 9 h 31 min | 26.9° |
| February | 06:26 | 11:50 | 17:15 | 10 h 48 min | 36.2° |
| March | 05:39 | 11:44 | 17:49 | 12 h 10 min | 47.0° |
| April | 04:46 | 11:35 | 18:26 | 13 h 40 min | 58.6° |
| May | 04:07 | 11:33 | 18:59 | 14 h 52 min | 67.0° |
| June | 03:57 | 11:38 | 19:20 | 15 h 23 min | 70.2° |
| July | 04:15 | 11:43 | 19:10 | 14 h 55 min | 67.3° |
| August | 04:48 | 11:40 | 18:31 | 13 h 43 min | 58.9° |
| September | 05:22 | 11:29 | 17:37 | 12 h 14 min | 47.5° |
| October | 05:57 | 11:21 | 16:45 | 10 h 48 min | 36.2° |
| November | 06:36 | 11:22 | 16:08 | 9 h 31 min | 26.9° |
| December | 07:05 | 11:34 | 16:04 | 8 h 59 min | 23.4° |
A year of daylight in Yoichi
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 Yoichi
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
34°collects the most energy over a year: 1122 kWh per kWp.
66°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 | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 976 | 87% | 0.79 | 5.4× |
| 15° | 1077 | 96% | 1.06 | 4.2× |
| 30° | 1121 | 100% | 1.28 | 3.4× |
| 34° year-round best | 1122 | 100% | 1.33 | 3.2× |
| 43° = latitude | 1110 | 99% | 1.42 | 2.9× |
| 45° | 1105 | 98% | 1.43 | 2.8× |
| 60° | 1031 | 92% | 1.51 | 2.5× |
| 66° off-grid best | 986 | 88% | 1.51 | 2.3× |
| 70° | 952 | 85% | 1.51 | 2.2× |
| 90° | 736 | 66% | 1.40 | 1.8× |
A fixed array in Yoichi produces the most over a year at 34°. The design month for an off-grid system is December: at 66° it makes 1.51 kWh per kWp a day, 14% more than at 34°, and costs 12% of the yearly total. Why steep panels win winter.
Off-grid solar in Yoichi at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 34° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 34° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 1.20 | 2.06 | 1.85 | 1.60 | -2.1 °C |
| February snow | 1.91 | 2.71 | 2.45 | 2.28 | -2.0 °C |
| March | 3.21 | 3.43 | 3.07 | 3.40 | 0.9 °C |
| April | 4.49 | 3.81 | 3.35 | 4.21 | 5.4 °C |
| May | 5.10 | 3.55 | 3.06 | 4.29 | 10.2 °C |
| June | 5.01 | 3.19 | 2.69 | 3.96 | 14.8 °C |
| July | 4.63 | 3.07 | 2.55 | 3.65 | 18.9 °C |
| August | 4.39 | 3.39 | 2.80 | 3.69 | 21.2 °C |
| September | 3.81 | 3.78 | 3.17 | 3.67 | 18.7 °C |
| October | 2.64 | 3.38 | 2.90 | 2.97 | 12.8 °C |
| November | 1.43 | 2.19 | 1.91 | 1.80 | 6.1 °C |
| December snow | 0.99 | 1.70 | 1.51 | 1.33 | 0.0 °C |
| Year | 3.24 avg | 3.02 avg | 952 kWh | 1122 kWh |
Sizing example. To run a 1 kWh-per-day load through December on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 780 Wp of panels at 70°, versus 890 Wp at 34°. The steep array is 12% smaller for the same winter. Size your own system.
Row spacing in Yoichi
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.
5.8 mrow pitch at 70°
4.7 mrow pitch at 34°
How Yoichi compares in Japan
Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.
1210thof 1,216 places in Japan for sunshine, shared: 3.24 peak sun hours a day on flat ground.
−13%solar energy a year compared with the average place in Japan: 1,122 against 1,284 kWh per kWp.
+49 mindaylight on the longest day, compared with Tokyo: 15 h 23 min against 14 h 35 min.
34°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); Yoichi ranks joint 1210th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.51 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 8 h 59 min, −46 min compared with Tokyo.
Solar forecast for Yoichi, 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 Yoichi
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Places near Yoichi
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A free, live card for Yoichi: 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.