Hokkaido · Japan · 42.87° N · 143.34° E
Solar position in Sarubetsu
Sun position, daylight and the best solar panel angle for Sarubetsu — computed for 42.87° N, 143.34° E, 25 m above sea level.
The sun right now
Sun in Sarubetsu today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:16 | sun 18° below horizon |
| Nautical dawn | 04:49 | 12° below |
| Civil dawn | 05:22 | 6° below |
| Sunrise | 05:51 | 106° ESE |
| Golden hour ends | 06:31 | sun 6° up |
| Solar noon | 11:10 | 35.1° high |
| Golden hour starts | 15:49 | sun 6° up |
| Sunset | 16:29 | 254° WSW |
| Civil dusk | 16:58 | 6° below |
| Nautical dusk | 17:31 | 12° below |
| Astronomical dusk | 18:04 | 18° below |
| Day length | 10 h 38 min | |
Sun path diagram for Sarubetsu
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 70.6° at solar noon in Sarubetsu; on the December solstice only 23.7°. 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 | 06:51 | 11:38 | 16:24 | 9 h 33 min | 27.2° |
| February | 06:15 | 11:40 | 17:05 | 10 h 49 min | 36.6° |
| March | 05:29 | 11:34 | 17:39 | 12 h 10 min | 47.3° |
| April | 04:36 | 11:25 | 18:15 | 13 h 39 min | 59.0° |
| May | 03:58 | 11:23 | 18:48 | 14 h 50 min | 67.3° |
| June | 03:47 | 11:28 | 19:08 | 15 h 21 min | 70.6° |
| July | 04:06 | 11:33 | 18:59 | 14 h 53 min | 67.6° |
| August | 04:38 | 11:29 | 18:20 | 13 h 42 min | 59.3° |
| September | 05:12 | 11:19 | 17:26 | 12 h 14 min | 47.9° |
| October | 05:46 | 11:11 | 16:35 | 10 h 49 min | 36.5° |
| November | 06:25 | 11:12 | 15:58 | 9 h 33 min | 27.3° |
| December | 06:53 | 11:24 | 15:55 | 9 h 01 min | 23.7° |
A year of daylight in Sarubetsu
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 Sarubetsu
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
41°collects the most energy over a year: 1318 kWh per kWp.
56°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° | 1066 | 81% | 1.28 | 3.4× |
| 15° | 1215 | 92% | 1.91 | 2.3× |
| 30° | 1300 | 99% | 2.45 | 1.8× |
| 41° year-round best | 1318 | 100% | 2.76 | 1.6× |
| 43° = latitude | 1317 | 100% | 2.80 | 1.6× |
| 45° | 1315 | 100% | 2.85 | 1.6× |
| 56° off-grid best | 1281 | 97% | 3.04 | 1.5× |
| 60° | 1259 | 96% | 3.09 | 1.5× |
| 70° | 1185 | 90% | 3.15 | 1.7× |
| 90° | 961 | 73% | 3.04 | 2.3× |
A fixed array in Sarubetsu produces the most over a year at 41°. The design month for an off-grid system is December: at 56° it makes 3.04 kWh per kWp a day, 10% more than at 41°, and costs 3% of the yearly total. Why steep panels win winter.
Off-grid solar in Sarubetsu at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 41° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 41° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 1.87 | 3.83 | 3.56 | 3.16 | -7.3 °C |
| February snow | 2.67 | 4.28 | 3.97 | 3.76 | -7.1 °C |
| March snow | 3.76 | 4.73 | 4.32 | 4.40 | -3.0 °C |
| April | 4.71 | 3.99 | 3.56 | 4.41 | 2.6 °C |
| May | 5.07 | 3.49 | 3.03 | 4.13 | 8.4 °C |
| June | 4.98 | 3.14 | 2.66 | 3.77 | 13.2 °C |
| July | 4.56 | 3.01 | 2.50 | 3.47 | 17.3 °C |
| August | 4.15 | 3.19 | 2.65 | 3.41 | 18.8 °C |
| September | 3.66 | 3.62 | 3.07 | 3.55 | 15.5 °C |
| October | 2.90 | 3.91 | 3.41 | 3.53 | 9.3 °C |
| November | 1.96 | 3.52 | 3.15 | 2.98 | 2.6 °C |
| December snow | 1.56 | 3.44 | 3.15 | 2.76 | -4.2 °C |
| Year | 3.49 avg | 3.67 avg | 1185 kWh | 1318 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 470 Wp of panels at 70°, versus 430 Wp at 41°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Sarubetsu
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.
5.7 mrow pitch at 70°
5.0 mrow pitch at 41°
How Sarubetsu compares in Japan
Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.
1084thof 1,216 places in Japan for sunshine, shared: 3.49 peak sun hours a day on flat ground.
+3%solar energy a year compared with the average place in Japan: 1,318 against 1,284 kWh per kWp.
+46 mindaylight on the longest day, compared with Tokyo: 15 h 21 min against 14 h 35 min.
41°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); Sarubetsu ranks joint 1084th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.51 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 9 h 01 min, −43 min compared with Tokyo.
Solar forecast for Sarubetsu, 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 Sarubetsu
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Places near Sarubetsu
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A free, live card for Sarubetsu: 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.