Osaka · Japan · 34.40° N · 135.34° E
Solar position in Ōkubo-naka
Sun position, daylight and the best solar panel angle for Ōkubo-naka — computed for 34.40° N, 135.34° E, 23 m above sea level.
The sun right now
Sun in Ōkubo-naka today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:47 | sun 18° below horizon |
| Nautical dawn | 05:16 | 12° below |
| Civil dawn | 05:46 | 6° below |
| Sunrise | 06:12 | 104° ESE |
| Golden hour ends | 06:46 | sun 6° up |
| Solar noon | 11:42 | 43.5° high |
| Golden hour starts | 16:38 | sun 6° up |
| Sunset | 17:12 | 256° WSW |
| Civil dusk | 17:38 | 6° below |
| Nautical dusk | 18:08 | 12° below |
| Astronomical dusk | 18:37 | 18° below |
| Day length | 11 h 01 min | |
Sun path diagram for Ōkubo-naka
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 79.0° at solar noon in Ōkubo-naka; on the December solstice only 32.2°. Sunrise swings from 61° ENE in June to 118° ESE in December — a 58° 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 | 12:09 | 17:16 | 10 h 14 min | 35.7° |
| February | 06:37 | 12:12 | 17:47 | 11 h 09 min | 45.0° |
| March | 06:01 | 12:06 | 18:10 | 12 h 09 min | 55.8° |
| April | 05:20 | 11:57 | 18:34 | 13 h 14 min | 67.4° |
| May | 04:52 | 11:55 | 18:58 | 14 h 05 min | 75.8° |
| June | 04:46 | 12:00 | 19:14 | 14 h 28 min | 79.0° |
| July | 05:01 | 12:05 | 19:08 | 14 h 07 min | 76.1° |
| August | 05:23 | 12:01 | 18:39 | 13 h 16 min | 67.7° |
| September | 05:45 | 11:51 | 17:57 | 12 h 12 min | 56.3° |
| October | 06:08 | 11:43 | 17:17 | 11 h 09 min | 44.9° |
| November | 06:37 | 11:44 | 16:51 | 10 h 14 min | 35.7° |
| December | 07:00 | 11:56 | 16:52 | 9 h 51 min | 32.2° |
A year of daylight in Ōkubo-naka
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 Ōkubo-naka
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
30°collects the most energy over a year: 1306 kWh per kWp.
49°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° | 1162 | 89% | 1.76 | 2.5× |
| 15° | 1269 | 97% | 2.32 | 1.9× |
| 30° year-round best | 1306 | 100% | 2.75 | 1.5× |
| 34° = latitude | 1303 | 100% | 2.83 | 1.5× |
| 45° | 1270 | 97% | 3.00 | 1.3× |
| 49° off-grid best | 1249 | 96% | 3.04 | 1.3× |
| 60° | 1165 | 89% | 3.07 | 1.4× |
| 70° | 1060 | 81% | 3.01 | 1.5× |
| 90° | 786 | 60% | 2.65 | 2.0× |
A fixed array in Ōkubo-naka produces the most over a year at 30°. The design month for an off-grid system is December: at 49° it makes 3.04 kWh per kWp a day, 11% more than at 30°, and costs 4% of the yearly total. Why steep panels win winter.
Off-grid solar in Ōkubo-naka at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 30° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 30° | Mean temp. |
|---|---|---|---|---|---|
| January | 2.34 | 3.42 | 3.05 | 2.88 | 3.2 °C |
| February | 3.00 | 3.57 | 3.16 | 3.31 | 4.2 °C |
| March | 4.00 | 3.83 | 3.36 | 3.96 | 7.2 °C |
| April | 4.86 | 3.56 | 3.06 | 4.23 | 12.2 °C |
| May | 5.29 | 3.16 | 2.64 | 4.18 | 17.0 °C |
| June | 4.79 | 2.72 | 2.22 | 3.61 | 21.0 °C |
| July | 4.99 | 2.87 | 2.32 | 3.74 | 24.9 °C |
| August | 5.23 | 3.48 | 2.82 | 4.16 | 25.8 °C |
| September | 4.12 | 3.51 | 2.89 | 3.64 | 22.4 °C |
| October | 3.33 | 3.70 | 3.13 | 3.40 | 16.7 °C |
| November | 2.60 | 3.67 | 3.18 | 3.06 | 11.1 °C |
| December | 2.15 | 3.40 | 3.01 | 2.75 | 5.6 °C |
| Year | 3.90 avg | 3.41 avg | 1060 kWh | 1306 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 430 Wp at 30°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Ōkubo-naka
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.
4.1 mrow pitch at 70°
3.5 mrow pitch at 30°
How Ōkubo-naka compares in Japan
Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.
239thof 1,216 places in Japan for sunshine, shared: 3.90 peak sun hours a day on flat ground.
+2%solar energy a year compared with the average place in Japan: 1,306 against 1,284 kWh per kWp.
−7 mindaylight on the longest day, compared with Tokyo: 14 h 28 min against 14 h 35 min.
30°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); Ōkubo-naka ranks joint 239th. 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 51 min, +7 min compared with Tokyo.
Solar forecast for Ōkubo-naka, 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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A free, live card for Ōkubo-naka: 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.