Gunma · Japan · 36.25° N · 139.53° E
Solar position in Tatebayashi
Sun position, daylight and the best solar panel angle for Tatebayashi — computed for 36.25° N, 139.53° E, 28 m above sea level.
The sun right now
Sun in Tatebayashi today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:31 | sun 18° below horizon |
| Nautical dawn | 05:01 | 12° below |
| Civil dawn | 05:31 | 6° below |
| Sunrise | 05:57 | 104° ESE |
| Golden hour ends | 06:33 | sun 6° up |
| Solar noon | 11:25 | 41.7° high |
| Golden hour starts | 16:18 | sun 6° up |
| Sunset | 16:53 | 256° WSW |
| Civil dusk | 17:20 | 6° below |
| Nautical dusk | 17:50 | 12° below |
| Astronomical dusk | 18:20 | 18° below |
| Day length | 10 h 56 min | |
Sun path diagram for Tatebayashi
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 77.2° at solar noon in Tatebayashi; on the December solstice only 30.3°. 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 | 06:50 | 11:53 | 16:56 | 10 h 06 min | 33.9° |
| February | 06:23 | 11:55 | 17:28 | 11 h 05 min | 43.2° |
| March | 05:44 | 11:49 | 17:54 | 12 h 09 min | 54.0° |
| April | 05:01 | 11:40 | 18:20 | 13 h 19 min | 65.6° |
| May | 04:31 | 11:38 | 18:45 | 14 h 14 min | 73.9° |
| June | 04:24 | 11:43 | 19:02 | 14 h 38 min | 77.2° |
| July | 04:39 | 11:48 | 18:56 | 14 h 16 min | 74.2° |
| August | 05:04 | 11:45 | 18:25 | 13 h 21 min | 65.9° |
| September | 05:28 | 11:34 | 17:40 | 12 h 12 min | 54.5° |
| October | 05:53 | 11:26 | 16:58 | 11 h 05 min | 43.1° |
| November | 06:24 | 11:27 | 16:30 | 10 h 06 min | 33.9° |
| December | 06:49 | 11:39 | 16:30 | 9 h 41 min | 30.3° |
A year of daylight in Tatebayashi
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 Tatebayashi
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
36°collects the most energy over a year: 1360 kWh per kWp.
38°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% | 2.51 | 2.2× |
| 15° | 1288 | 95% | 2.95 | 1.6× |
| 30° | 1354 | 100% | 3.21 | 1.3× |
| 36° year-round best = latitude | 1360 | 100% | 3.27 | 1.3× |
| 38° off-grid best | 1359 | 100% | 3.28 | 1.3× |
| 45° | 1345 | 99% | 3.29 | 1.4× |
| 60° | 1261 | 93% | 3.18 | 1.7× |
| 70° | 1167 | 86% | 3.00 | 1.9× |
| 90° | 902 | 66% | 2.42 | 2.8× |
A fixed array in Tatebayashi produces the most over a year at 36°. The design month for an off-grid system is October: at 38° it makes 3.28 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Tatebayashi at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 36° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 36° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.66 | 4.79 | 4.35 | 3.95 | -0.6 °C |
| February snow | 3.32 | 4.63 | 4.18 | 4.15 | 0.3 °C |
| March | 4.13 | 4.17 | 3.71 | 4.29 | 4.0 °C |
| April | 4.83 | 3.66 | 3.17 | 4.24 | 9.7 °C |
| May | 5.16 | 3.20 | 2.69 | 4.02 | 15.3 °C |
| June | 4.64 | 2.72 | 2.24 | 3.42 | 19.4 °C |
| July | 4.55 | 2.75 | 2.23 | 3.35 | 23.4 °C |
| August | 4.73 | 3.27 | 2.67 | 3.72 | 24.3 °C |
| September | 3.78 | 3.29 | 2.73 | 3.37 | 20.3 °C |
| October | 3.08 | 3.51 | 3.00 | 3.27 | 14.1 °C |
| November | 2.61 | 4.03 | 3.54 | 3.42 | 8.0 °C |
| December | 2.35 | 4.35 | 3.91 | 3.56 | 2.3 °C |
| Year | 3.82 avg | 3.69 avg | 1167 kWh | 1360 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 530 Wp of panels at 70°, versus 360 Wp at 36°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Tatebayashi
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 36°
How Tatebayashi compares in Japan
Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.
664thof 1,216 places in Japan for sunshine, shared: 3.82 peak sun hours a day on flat ground.
+6%solar energy a year compared with the average place in Japan: 1,360 against 1,284 kWh per kWp.
+3 mindaylight on the longest day, compared with Tokyo: 14 h 38 min against 14 h 35 min.
36°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); Tatebayashi ranks joint 664th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.23 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 9 h 41 min, −3 min compared with Tokyo.
Solar forecast for Tatebayashi, 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 Tatebayashi: 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.