Solarposition.org

Taiwan · Taiwan · 23.89° N · 120.52° E

Solar position in Tianwei

Sun position, daylight and the best solar panel angle for Tianwei — computed for 23.89° N, 120.52° E, 34 m above sea level.

Sunrise today05:59103° ESE
Sunset today17:23257° WSW
Best panel angle20°year-round, facing south
Off-grid angle37°best for the darkest month

The sun right now

Azimuth180.0°
Elevation54.0°
At solar noon, 11:41Open on the sun map

Sun in Tianwei today

Sunday, 25 October 2026 · local time UTC+8

EventTimeDirection / height
Astronomical dawn04:43sun 18° below horizon
Nautical dawn05:1012° below
Civil dawn05:366° below
Sunrise05:59103° ESE
Golden hour ends06:30sun 6° up
Solar noon11:4154.0° high
Golden hour starts16:52sun 6° up
Sunset17:23257° WSW
Civil dusk17:466° below
Nautical dusk18:1312° below
Astronomical dusk18:3918° below
Day length11 h 24 min

Sun path diagram for Tianwei

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 solstice6789101112131415161718EquinoxDecember solstice7891011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 89.5° at solar noon in Tianwei; on the December solstice only 42.7°. Sunrise swings from 64° ENE in June to 115° ESE in December — a 52° 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
January06:4212:0917:3610 h 54 min46.2°
February06:2612:1117:5611 h 29 min55.5°
March06:0112:0518:0912 h 08 min66.3°
April05:3111:5618:2112 h 50 min78.0°
May05:1311:5418:3613 h 23 min86.3°
June05:1111:5918:4813 h 37 min89.5°
July05:2212:0418:4613 h 24 min86.6°
August05:3512:0118:2612 h 51 min78.2°
September05:4611:5017:5512 h 10 min66.8°
October05:5711:4217:2611 h 29 min55.4°
November06:1611:4317:1010 h 54 min46.2°
December06:3511:5517:1510 h 40 min42.7°

A year of daylight in Tianwei

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 Tianwei

Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.

20°collects the most energy over a year: 1301 kWh per kWp.

37°gives the most in the darkest month — the one an off-grid system is sized for.

30%40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 20°Best worst-month 37°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°124295%2.391.9×
15°1298100%2.851.5×
20° year-round best1301100%2.971.4×
24° = latitude1298100%3.051.4×
30°128599%3.141.3×
37° off-grid best125596%3.221.2×
45°120493%3.261.3×
60°106182%3.191.5×
70°93872%3.041.7×
90°65951%2.522.3×

A fixed array in Tianwei produces the most over a year at 20°. The design month for an off-grid system is December: at 37° it makes 3.22 kWh per kWp a day, 9% more than at 20°, and costs 4% of the yearly total. Why steep panels win winter.

Off-grid solar in Tianwei at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 20° (year-round best).

012345January: 2.98 (70°)3.0JanFebruary: 2.77 (70°)2.8FebMarch: 2.50 (70°)2.5MarApril: 2.22 (70°)2.2AprMay: 2.01 (70°)2.0MayJune: 1.87 (70°)1.9JunJuly: 2.02 (70°)2.0JulAugust: 2.29 (70°)2.3AugSeptember: 2.80 (70°)2.8SepOctober: 3.26 (70°)3.3OctNovember: 3.08 (70°)3.1NovDecember: 3.04 (70°)3.0Dec20°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 20°Mean temp.
January3.093.532.983.0217.0 °C
February3.453.302.773.1717.8 °C
March3.863.012.503.3119.8 °C
April4.302.722.223.4522.7 °C
May4.802.502.013.6725.2 °C
June5.182.351.873.8426.6 °C
July5.722.542.024.2427.6 °C
August5.132.852.293.9827.5 °C
September4.853.452.803.9926.7 °C
October4.383.973.263.8924.6 °C
November3.413.723.083.2222.4 °C
December3.003.623.042.9718.9 °C
Year4.27 avg3.13 avg938 kWh1301 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 630 Wp of panels at 70°, versus 400 Wp at 20°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Tianwei

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.

3.0 mrow pitch at 70°

2.7 mrow pitch at 20°

Row spacing calculator

How Tianwei compares in Taiwan

Against the other 66 places in Taiwan with climate data, for a fixed array at its best angle.

22ndof 67 places in Taiwan for sunshine, shared: 4.27 peak sun hours a day on flat ground.

+4%solar energy a year compared with the average place in Taiwan: 1,301 against 1,256 kWh per kWp.

−5 mindaylight on the longest day, compared with Taipei: 13 h 37 min against 13 h 42 min.

20°best year-round tilt here; across Taiwan it runs from 17° in Keelung to 21° in Chiayi City.

Of the 67 places in Taiwan, Donggang and one other place get the most sun (4.59 peak sun hours a day) and Sanzhi the least (3.74); Tianwei ranks joint 22nd. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.87 kWh a day here, against 1.85 kWh on average in Taiwan. The shortest day lasts 10 h 40 min, +5 min compared with Taipei.

The sunniest places in Taiwan

Solar forecast for Tianwei, 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 Tianwei

What is the best solar panel angle in Tianwei?
For a fixed array facing south, the best year-round tilt in Tianwei is 20°, worth about 1301 kWh per kWp a year. An off-grid system that has to get through December does better at about 37°.
What time is sunrise and sunset in Tianwei today?
On 25 October 2026 the sun rises at 05:59 and sets at 17:23 local time (UTC+8), giving 11 h 24 min of daylight. Solar noon is at 11:41.
How many peak sun hours does Tianwei get?
On a flat surface 4.3 hours a day averaged over the year, from 3.0 in December to 5.7 in July. Panels tilted at 70° receive 2.3 sun hours a day in June.
How high does the sun get in Tianwei?
At solar noon the sun stands 89.5° above the horizon on the June solstice and 42.7° on the December solstice.
Is Tianwei a good place for solar panels?
With 4.3 peak sun hours a day on flat ground, Tianwei ranks joint 22nd of 67 places in Taiwan for sunshine. A 1 kWp array at the best angle (20°) makes about 1,301 kWh a year here, 4% more than the average place in Taiwan.

Places near Tianwei

All places in Taiwan

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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.