Jiangsu · China · 34.52° N · 117.01° E
Solar position in Zhangzhuang
Sun position, daylight and the best solar panel angle for Zhangzhuang — computed for 34.52° N, 117.01° E, 37 m above sea level.
The sun right now
Sun in Zhangzhuang today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:01 | sun 18° below horizon |
| Nautical dawn | 05:30 | 12° below |
| Civil dawn | 05:59 | 6° below |
| Sunrise | 06:25 | 104° ESE |
| Golden hour ends | 07:00 | sun 6° up |
| Solar noon | 11:55 | 43.4° high |
| Golden hour starts | 16:51 | sun 6° up |
| Sunset | 17:26 | 256° WSW |
| Civil dusk | 17:51 | 6° below |
| Nautical dusk | 18:21 | 12° below |
| Astronomical dusk | 18:50 | 18° below |
| Day length | 11 h 01 min | |
Sun path diagram for Zhangzhuang
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 78.9° at solar noon in Zhangzhuang; on the December solstice only 32.1°. Sunrise swings from 60° ENE in June to 118° ESE in December — a 58° 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 | 07:16 | 12:23 | 17:30 | 10 h 14 min | 35.6° |
| February | 06:51 | 12:25 | 18:00 | 11 h 09 min | 44.9° |
| March | 06:14 | 12:19 | 18:24 | 12 h 09 min | 55.7° |
| April | 05:33 | 12:10 | 18:48 | 13 h 15 min | 67.3° |
| May | 05:05 | 12:08 | 19:11 | 14 h 06 min | 75.7° |
| June | 04:59 | 12:13 | 19:27 | 14 h 28 min | 78.9° |
| July | 05:14 | 12:18 | 19:22 | 14 h 08 min | 76.0° |
| August | 05:36 | 12:15 | 18:53 | 13 h 16 min | 67.6° |
| September | 05:58 | 12:05 | 18:10 | 12 h 12 min | 56.2° |
| October | 06:22 | 11:56 | 17:30 | 11 h 09 min | 44.8° |
| November | 06:50 | 11:57 | 17:04 | 10 h 14 min | 35.6° |
| December | 07:14 | 12:09 | 17:05 | 9 h 51 min | 32.1° |
A year of daylight in Zhangzhuang
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 Zhangzhuang
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
31°collects the most energy over a year: 1257 kWh per kWp.
43°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° | 1118 | 89% | 1.81 | 2.3× |
| 15° | 1220 | 97% | 2.41 | 1.8× |
| 30° | 1257 | 100% | 2.86 | 1.4× |
| 31° year-round best | 1257 | 100% | 2.88 | 1.4× |
| 35° = latitude | 1254 | 100% | 2.97 | 1.4× |
| 43° off-grid best | 1234 | 98% | 3.11 | 1.3× |
| 45° | 1226 | 98% | 3.13 | 1.3× |
| 60° | 1129 | 90% | 3.21 | 1.4× |
| 70° | 1032 | 82% | 3.16 | 1.6× |
| 90° | 775 | 62% | 2.79 | 2.1× |
A fixed array in Zhangzhuang produces the most over a year at 31°. The design month for an off-grid system is December: at 43° it makes 3.11 kWh per kWp a day, 8% more than at 31°, and costs 2% of the yearly total. Why steep panels win winter.
Off-grid solar in Zhangzhuang at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 31° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 31° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.31 | 3.51 | 3.17 | 2.92 | -0.3 °C |
| February | 2.82 | 3.30 | 2.94 | 3.10 | 2.8 °C |
| March | 4.06 | 3.86 | 3.37 | 3.98 | 8.7 °C |
| April | 4.81 | 3.55 | 3.00 | 4.11 | 15.5 °C |
| May | 5.24 | 3.19 | 2.62 | 4.05 | 21.7 °C |
| June | 5.04 | 2.87 | 2.31 | 3.70 | 26.1 °C |
| July | 4.59 | 2.72 | 2.17 | 3.39 | 27.8 °C |
| August | 4.46 | 3.02 | 2.44 | 3.50 | 26.6 °C |
| September | 3.93 | 3.33 | 2.75 | 3.46 | 22.0 °C |
| October | 3.23 | 3.51 | 2.98 | 3.27 | 15.8 °C |
| November | 2.49 | 3.45 | 3.02 | 2.95 | 8.0 °C |
| December | 2.18 | 3.51 | 3.16 | 2.88 | 1.2 °C |
| Year | 3.77 avg | 3.32 avg | 1032 kWh | 1257 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 540 Wp of panels at 70°, versus 410 Wp at 31°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Zhangzhuang
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.
4.1 mrow pitch at 70°
3.6 mrow pitch at 31°
How Zhangzhuang compares in China
Against the other 2,094 places in China with climate data, for a fixed array at its best angle.
1049thof 2,095 places in China for sunshine, shared: 3.77 peak sun hours a day on flat ground.
±0%solar energy a year compared with the average place in China: 1,257 against 1,262 kWh per kWp.
+17 mindaylight on the longest day, compared with Shanghai: 14 h 28 min against 14 h 11 min.
31°best year-round tilt here; across China it runs from 14° in Haikou to 52° in Xilinji.
Of the 2,095 places in China, Nyêmo gets the most sun (5.75 peak sun hours a day) and Baima and 11 other places the least (2.91); Zhangzhuang ranks joint 1049th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.17 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 9 h 51 min, −16 min compared with Shanghai.
Solar forecast for Zhangzhuang, 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 Zhangzhuang
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Places near Zhangzhuang
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A free, live card for Zhangzhuang: 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.