Taiwan · Taiwan · 24.07° N · 120.56° E
Solar position in Chang-hua
Sun position, daylight and the best solar panel angle for Chang-hua — computed for 24.07° N, 120.56° E, 60 m above sea level.
The sun right now
Sun in Chang-hua today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:43 | sun 18° below horizon |
| Nautical dawn | 05:10 | 12° below |
| Civil dawn | 05:36 | 6° below |
| Sunrise | 05:59 | 103° ESE |
| Golden hour ends | 06:30 | sun 6° up |
| Solar noon | 11:41 | 53.9° high |
| Golden hour starts | 16:52 | sun 6° up |
| Sunset | 17:23 | 257° WSW |
| Civil dusk | 17:46 | 6° below |
| Nautical dusk | 18:13 | 12° below |
| Astronomical dusk | 18:39 | 18° below |
| Day length | 11 h 24 min | |
Sun path diagram for Chang-hua
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 89.4° at solar noon in Chang-hua; on the December solstice only 42.5°. 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.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 06:42 | 12:09 | 17:35 | 10 h 53 min | 46.0° |
| February | 06:26 | 12:11 | 17:56 | 11 h 29 min | 55.4° |
| March | 06:01 | 12:05 | 18:09 | 12 h 08 min | 66.2° |
| April | 05:31 | 11:56 | 18:21 | 12 h 50 min | 77.8° |
| May | 05:12 | 11:54 | 18:36 | 13 h 24 min | 86.1° |
| June | 05:10 | 11:59 | 18:48 | 13 h 38 min | 89.4° |
| July | 05:21 | 12:04 | 18:46 | 13 h 25 min | 86.4° |
| August | 05:35 | 12:00 | 18:26 | 12 h 51 min | 78.0° |
| September | 05:45 | 11:50 | 17:55 | 12 h 10 min | 66.6° |
| October | 05:57 | 11:42 | 17:26 | 11 h 29 min | 55.3° |
| November | 06:16 | 11:43 | 17:10 | 10 h 53 min | 46.0° |
| December | 06:36 | 11:55 | 17:15 | 10 h 39 min | 42.5° |
A year of daylight in Chang-hua
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 Chang-hua
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: 1280 kWh per kWp.
40°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° | 1225 | 96% | 2.30 | 2.0× |
| 15° | 1277 | 100% | 2.72 | 1.6× |
| 19° year-round best | 1280 | 100% | 2.81 | 1.5× |
| 24° = latitude | 1276 | 100% | 2.91 | 1.4× |
| 30° | 1262 | 99% | 3.00 | 1.3× |
| 40° off-grid best | 1215 | 95% | 3.08 | 1.3× |
| 45° | 1181 | 92% | 3.10 | 1.3× |
| 60° | 1040 | 81% | 3.03 | 1.5× |
| 70° | 918 | 72% | 2.88 | 1.7× |
| 90° | 643 | 50% | 2.39 | 2.1× |
A fixed array in Chang-hua produces the most over a year at 19°. The design month for an off-grid system is December: at 40° it makes 3.08 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 Chang-hua at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 19° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 19° | Mean temp. |
|---|---|---|---|---|---|
| January | 2.95 | 3.33 | 2.81 | 2.85 | 16.8 °C |
| February | 3.29 | 3.12 | 2.62 | 3.00 | 17.4 °C |
| March | 3.74 | 2.92 | 2.43 | 3.20 | 19.4 °C |
| April | 4.21 | 2.68 | 2.19 | 3.39 | 22.5 °C |
| May | 4.76 | 2.49 | 2.00 | 3.66 | 25.0 °C |
| June | 5.19 | 2.37 | 1.89 | 3.87 | 26.6 °C |
| July | 5.80 | 2.58 | 2.05 | 4.33 | 27.6 °C |
| August | 5.21 | 2.90 | 2.33 | 4.05 | 27.6 °C |
| September | 4.83 | 3.45 | 2.80 | 3.98 | 26.7 °C |
| October | 4.30 | 3.89 | 3.20 | 3.80 | 24.6 °C |
| November | 3.30 | 3.58 | 2.97 | 3.09 | 22.2 °C |
| December | 2.88 | 3.43 | 2.88 | 2.81 | 18.7 °C |
| Year | 4.21 avg | 3.06 avg | 918 kWh | 1280 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 620 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 Chang-hua
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°
How Chang-hua compares in Taiwan
Against the other 66 places in Taiwan with climate data, for a fixed array at its best angle.
33rdof 67 places in Taiwan for sunshine: 4.21 peak sun hours a day on flat ground.
+2%solar energy a year compared with the average place in Taiwan: 1,280 against 1,256 kWh per kWp.
−4 mindaylight on the longest day, compared with Taipei: 13 h 38 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); Chang-hua ranks 33rd. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.89 kWh a day here, against 1.85 kWh on average in Taiwan. The shortest day lasts 10 h 39 min, +4 min compared with Taipei.
Solar forecast for Chang-hua, 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 Chang-hua
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Places near Chang-hua
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A free, live card for Chang-hua: 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.