Solarposition.org

Niigata · Japan · 37.80° N · 139.12° E

Solar position in Niitsu-honchō

Sun position, daylight and the best solar panel angle for Niitsu-honchō — computed for 37.80° N, 139.12° E, 8 m above sea level.

Sunrise today06:01105° ESE
Sunset today16:53255° WSW
Best panel angle29°year-round, facing south
Off-grid angle57°best for the darkest month

The sun right now

Azimuth180.0°
Elevation40.2°
At solar noon, 11:27Open on the sun map

Sun in Niitsu-honchō today

Sunday, 25 October 2026 · local time UTC+9

EventTimeDirection / height
Astronomical dawn04:33sun 18° below horizon
Nautical dawn05:0312° below
Civil dawn05:346° below
Sunrise06:01105° ESE
Golden hour ends06:37sun 6° up
Solar noon11:2740.2° high
Golden hour starts16:17sun 6° up
Sunset16:53255° WSW
Civil dusk17:206° below
Nautical dusk17:5112° below
Astronomical dusk18:2118° below
Day length10 h 52 min

Sun path diagram for Niitsu-honchō

Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.

15°30°45°60°75°N30°60°E120°150°S210°240°W300°330°June solstice5678910111213141516171819EquinoxDecember solstice8910111213141516Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 75.6° at solar noon in Niitsu-honchō; on the December solstice only 28.8°. Sunrise swings from 59° ENE in June to 119° ESE in December — a 60° 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.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January06:5511:5416:549 h 59 min32.3°
February06:2611:5717:2811 h 02 min41.6°
March05:4611:5017:5512 h 09 min52.4°
April05:0011:4218:2413 h 23 min64.0°
May04:2911:4018:5114 h 22 min72.4°
June04:2111:4519:0814 h 47 min75.6°
July04:3711:4919:0114 h 24 min72.7°
August05:0311:4618:2913 h 25 min64.3°
September05:3011:3617:4212 h 13 min52.9°
October05:5711:2716:5811 h 01 min41.6°
November06:2911:2916:289 h 59 min32.3°
December06:5511:4116:279 h 33 min28.8°

A year of daylight in Niitsu-honchō

Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.

00:0003:0006:0009:0012:0015:0018:0021:0000:00JanFebMarAprMayJunJulAugSepOctNovDec

Best solar panel angle in Niitsu-honchō

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: 1143 kWh per kWp.

57°gives the most in the darkest month — the one an off-grid system is sized for.

50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 29°Best worst-month 57°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°103490%1.103.9×
15°111898%1.403.1×
29° year-round best1143100%1.612.6×
30°1143100%1.622.6×
38° = latitude113199%1.702.4×
45°110697%1.752.2×
57° off-grid best103591%1.781.9×
60°101289%1.781.9×
70°91980%1.741.7×
90°68260%1.541.6×

A fixed array in Niitsu-honchō produces the most over a year at 29°. The design month for an off-grid system is December: at 57° it makes 1.78 kWh per kWp a day, 11% more than at 29°, and costs 9% of the yearly total. Why steep panels win winter.

Off-grid solar in Niitsu-honchō at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 29° (year-round best).

012345January: 1.79 (70°)1.8JanFebruary: 2.35 (70°)2.3FebMarch: 2.94 (70°)2.9MarApril: 3.01 (70°)3.0AprMay: 2.80 (70°)2.8MayJune: 2.50 (70°)2.5JunJuly: 2.31 (70°)2.3JulAugust: 2.79 (70°)2.8AugSeptember: 2.89 (70°)2.9SepOctober: 2.79 (70°)2.8OctNovember: 2.32 (70°)2.3NovDecember: 1.74 (70°)1.7Dec29°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 29°Mean temp.
January1.512.021.791.721.0 °C
February2.282.632.352.451.1 °C
March3.423.322.943.393.9 °C
April4.473.473.014.009.0 °C
May5.183.312.804.2314.5 °C
June5.123.022.503.9819.0 °C
July4.592.842.313.5523.0 °C
August4.833.422.793.9424.6 °C
September3.893.482.893.5220.9 °C
October2.883.292.792.9615.1 °C
November1.912.682.322.209.4 °C
December1.361.981.741.613.9 °C
Year3.46 avg2.96 avg919 kWh1143 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 680 Wp of panels at 70°, versus 730 Wp at 29°. The steep array is 8% smaller for the same winter. Size your own system.

Row spacing in Niitsu-honchō

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.

4.6 mrow pitch at 70°

3.8 mrow pitch at 29°

Row spacing calculator

How Niitsu-honchō compares in Japan

Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.

1104thof 1,216 places in Japan for sunshine, shared: 3.46 peak sun hours a day on flat ground.

−11%solar energy a year compared with the average place in Japan: 1,143 against 1,284 kWh per kWp.

+12 mindaylight on the longest day, compared with Tokyo: 14 h 47 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); Niitsu-honchō ranks joint 1104th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.74 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 9 h 33 min, −12 min compared with Tokyo.

The sunniest places in Japan

Solar forecast for Niitsu-honchō, next 48 hours

Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.

Loading the latest forecast…

Questions about the sun in Niitsu-honchō

What is the best solar panel angle in Niitsu-honchō?
For a fixed array facing south, the best year-round tilt in Niitsu-honchō is 29°, worth about 1143 kWh per kWp a year. An off-grid system that has to get through December does better at about 57°.
What time is sunrise and sunset in Niitsu-honchō today?
On 25 October 2026 the sun rises at 06:01 and sets at 16:53 local time (UTC+9), giving 10 h 52 min of daylight. Solar noon is at 11:27.
How many peak sun hours does Niitsu-honchō get?
On a flat surface 3.5 hours a day averaged over the year, from 1.4 in December to 5.2 in May. Panels tilted at 70° receive 2.0 sun hours a day in December.
How high does the sun get in Niitsu-honchō?
At solar noon the sun stands 75.6° above the horizon on the June solstice and 28.8° on the December solstice.
Is Niitsu-honchō a good place for solar panels?
With 3.5 peak sun hours a day on flat ground, Niitsu-honchō ranks joint 1104th of 1,216 places in Japan for sunshine. A 1 kWp array at the best angle (29°) makes about 1,143 kWh a year here, 11% less than the average place in Japan.

Places near Niitsu-honchō

All places in Japan

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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.