Solarposition.org

Taiwan · Taiwan · 23.98° N · 120.69° E

Solar position in Caotun

Sun position, daylight and the best solar panel angle for Caotun — computed for 23.98° N, 120.69° E, 107 m above sea level.

Sunrise today05:59103° ESE
Sunset today17:23257° WSW
Best panel angle19°year-round, facing south
Off-grid angle40°best for the darkest month

The sun right now

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

Sun in Caotun today

Sunday, 25 October 2026 · local time UTC+8

EventTimeDirection / height
Astronomical dawn04:43sun 18° below horizon
Nautical dawn05:0912° 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 dusk18:1212° below
Astronomical dusk18:3918° below
Day length11 h 24 min

Sun path diagram for Caotun

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 Caotun; on the December solstice only 42.6°. 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
January06:4112:0817:3510 h 54 min46.1°
February06:2612:1017:5511 h 29 min55.5°
March06:0012:0418:0812 h 08 min66.2°
April05:3111:5618:2112 h 50 min77.9°
May05:1211:5318:3513 h 23 min86.2°
June05:1011:5818:4713 h 37 min89.5°
July05:2112:0318:4513 h 24 min86.5°
August05:3412:0018:2512 h 51 min78.1°
September05:4511:5017:5512 h 10 min66.7°
October05:5711:4117:2611 h 29 min55.4°
November06:1611:4217:0910 h 54 min46.1°
December06:3511:5517:1410 h 39 min42.6°

A year of daylight in Caotun

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 Caotun

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

19°collects the most energy over a year: 1272 kWh per kWp.

40°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 19°Best worst-month 40°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°121796%2.282.0×
15°1269100%2.711.6×
19° year-round best1272100%2.801.5×
24° = latitude1268100%2.901.4×
30°125499%2.991.3×
40° off-grid best120895%3.071.2×
45°117492%3.091.3×
60°103381%3.021.5×
70°91172%2.881.7×
90°63850%2.382.1×

A fixed array in Caotun produces the most over a year at 19°. The design month for an off-grid system is December: at 40° it makes 3.07 kWh per kWp a day, 10% more than at 19°, and costs 5% of the yearly total. Why steep panels win winter.

Off-grid solar in Caotun at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 19° (year-round best).

012345January: 2.81 (70°)2.8JanFebruary: 2.63 (70°)2.6FebMarch: 2.41 (70°)2.4MarApril: 2.16 (70°)2.2AprMay: 1.98 (70°)2.0MayJune: 1.87 (70°)1.9JunJuly: 2.03 (70°)2.0JulAugust: 2.31 (70°)2.3AugSeptember: 2.77 (70°)2.8SepOctober: 3.17 (70°)3.2OctNovember: 2.95 (70°)3.0NovDecember: 2.88 (70°)2.9Dec19°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 19°Mean temp.
January2.943.322.812.8416.8 °C
February3.293.132.633.0117.5 °C
March3.712.902.413.1819.5 °C
April4.172.642.163.3622.4 °C
May4.712.451.983.6224.9 °C
June5.162.341.873.8526.4 °C
July5.762.552.034.3127.4 °C
August5.172.872.314.0227.3 °C
September4.783.412.773.9526.4 °C
October4.253.863.173.7724.3 °C
November3.273.562.953.0722.0 °C
December2.863.422.882.8018.5 °C
Year4.18 avg3.04 avg911 kWh1272 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 420 Wp at 19°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Caotun

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 19°

Row spacing calculator

How Caotun compares in Taiwan

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

36thof 67 places in Taiwan for sunshine, shared: 4.18 peak sun hours a day on flat ground.

+1%solar energy a year compared with the average place in Taiwan: 1,272 against 1,256 kWh per kWp.

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

19°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); Caotun ranks joint 36th. 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 39 min, +5 min compared with Taipei.

The sunniest places in Taiwan

Solar forecast for Caotun, 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 Caotun

What is the best solar panel angle in Caotun?
For a fixed array facing south, the best year-round tilt in Caotun is 19°, worth about 1272 kWh per kWp a year. An off-grid system that has to get through December does better at about 40°.
What time is sunrise and sunset in Caotun 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 Caotun get?
On a flat surface 4.2 hours a day averaged over the year, from 2.9 in December to 5.8 in July. Panels tilted at 70° receive 2.3 sun hours a day in June.
How high does the sun get in Caotun?
At solar noon the sun stands 89.5° above the horizon on the June solstice and 42.6° on the December solstice.
Is Caotun a good place for solar panels?
With 4.2 peak sun hours a day on flat ground, Caotun ranks joint 36th of 67 places in Taiwan for sunshine. A 1 kWp array at the best angle (19°) makes about 1,272 kWh a year here, 1% more than the average place in Taiwan.

Places near Caotun

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.