Ehime · Japan · 33.75° N · 132.70° E
Solar position in Iyo
Sun position, daylight and the best solar panel angle for Iyo — computed for 33.75° N, 132.70° E, 14 m above sea level.
The sun right now
Sun in Iyo today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:58 | sun 18° below horizon |
| Nautical dawn | 05:27 | 12° below |
| Civil dawn | 05:56 | 6° below |
| Sunrise | 06:21 | 104° ESE |
| Golden hour ends | 06:56 | sun 6° up |
| Solar noon | 11:53 | 44.2° high |
| Golden hour starts | 16:50 | sun 6° up |
| Sunset | 17:24 | 256° WSW |
| Civil dusk | 17:49 | 6° below |
| Nautical dusk | 18:18 | 12° below |
| Astronomical dusk | 18:47 | 18° below |
| Day length | 11 h 02 min | |
Sun path diagram for Iyo
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 79.7° at solar noon in Iyo; on the December solstice only 32.8°. Sunrise swings from 61° ENE in June to 118° ESE in December — a 57° 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 | 07:12 | 12:20 | 17:28 | 10 h 17 min | 36.4° |
| February | 06:47 | 12:22 | 17:58 | 11 h 11 min | 45.7° |
| March | 06:12 | 12:16 | 18:21 | 12 h 09 min | 56.5° |
| April | 05:31 | 12:08 | 18:44 | 13 h 13 min | 68.1° |
| May | 05:04 | 12:05 | 19:07 | 14 h 03 min | 76.4° |
| June | 04:58 | 12:10 | 19:22 | 14 h 24 min | 79.7° |
| July | 05:13 | 12:15 | 19:17 | 14 h 04 min | 76.7° |
| August | 05:35 | 12:12 | 18:49 | 13 h 14 min | 68.4° |
| September | 05:56 | 12:02 | 18:08 | 12 h 12 min | 57.0° |
| October | 06:18 | 11:53 | 17:28 | 11 h 10 min | 45.6° |
| November | 06:46 | 11:54 | 17:03 | 10 h 17 min | 36.4° |
| December | 07:09 | 12:07 | 17:04 | 9 h 55 min | 32.8° |
A year of daylight in Iyo
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 Iyo
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
29°collects the most energy over a year: 1301 kWh per kWp.
52°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° | 1167 | 90% | 1.71 | 2.6× |
| 15° | 1269 | 98% | 2.20 | 2.0× |
| 29° year-round best | 1301 | 100% | 2.55 | 1.7× |
| 30° | 1301 | 100% | 2.57 | 1.7× |
| 34° = latitude | 1298 | 100% | 2.65 | 1.6× |
| 45° | 1261 | 97% | 2.79 | 1.4× |
| 52° off-grid best | 1219 | 94% | 2.83 | 1.4× |
| 60° | 1153 | 89% | 2.84 | 1.4× |
| 70° | 1046 | 80% | 2.77 | 1.6× |
| 90° | 770 | 59% | 2.43 | 2.0× |
A fixed array in Iyo produces the most over a year at 29°. The design month for an off-grid system is December: at 52° it makes 2.83 kWh per kWp a day, 11% more than at 29°, and costs 6% of the yearly total. Why steep panels win winter.
Off-grid solar in Iyo at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 29° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 29° | Mean temp. |
|---|---|---|---|---|---|
| January | 2.35 | 3.33 | 2.95 | 2.80 | 5.1 °C |
| February | 3.04 | 3.58 | 3.15 | 3.30 | 6.1 °C |
| March | 4.08 | 3.87 | 3.38 | 4.00 | 8.8 °C |
| April | 4.94 | 3.59 | 3.06 | 4.28 | 13.4 °C |
| May | 5.32 | 3.13 | 2.62 | 4.19 | 17.8 °C |
| June | 4.64 | 2.62 | 2.14 | 3.49 | 21.5 °C |
| July | 5.01 | 2.83 | 2.29 | 3.76 | 25.3 °C |
| August | 5.22 | 3.43 | 2.78 | 4.14 | 26.2 °C |
| September | 4.21 | 3.55 | 2.92 | 3.70 | 23.2 °C |
| October | 3.50 | 3.86 | 3.25 | 3.54 | 18.0 °C |
| November | 2.62 | 3.60 | 3.10 | 3.00 | 12.7 °C |
| December | 2.09 | 3.16 | 2.77 | 2.55 | 7.4 °C |
| Year | 3.92 avg | 3.38 avg | 1046 kWh | 1301 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 550 Wp of panels at 70°, versus 460 Wp at 29°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Iyo
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.
4.0 mrow pitch at 70°
3.5 mrow pitch at 29°
How Iyo compares in Japan
Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.
194thof 1,216 places in Japan for sunshine, shared: 3.92 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in Japan: 1,301 against 1,284 kWh per kWp.
−11 mindaylight on the longest day, compared with Tokyo: 14 h 24 min against 14 h 35 min.
29°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); Iyo ranks joint 194th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 2.14 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 9 h 55 min, +10 min compared with Tokyo.
Solar forecast for Iyo, 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 Iyo
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Places near Iyo
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A free, live card for Iyo: 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.