Tianjin · China · 38.99° N · 117.38° E
Solar position in Xianshuigu
Sun position, daylight and the best solar panel angle for Xianshuigu — computed for 38.99° N, 117.38° E, 5 m above sea level.
The sun right now
Sun in Xianshuigu today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:00 | sun 18° below horizon |
| Nautical dawn | 05:31 | 12° below |
| Civil dawn | 06:02 | 6° below |
| Sunrise | 06:29 | 105° ESE |
| Golden hour ends | 07:06 | sun 6° up |
| Solar noon | 11:54 | 39.0° high |
| Golden hour starts | 16:41 | sun 6° up |
| Sunset | 17:18 | 255° WSW |
| Civil dusk | 17:46 | 6° below |
| Nautical dusk | 18:17 | 12° below |
| Astronomical dusk | 18:48 | 18° below |
| Day length | 10 h 49 min | |
Sun path diagram for Xianshuigu
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 74.5° at solar noon in Xianshuigu; on the December solstice only 27.6°. Sunrise swings from 58° ENE in June to 120° ESE in December — a 62° 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 | 07:25 | 12:21 | 17:18 | 9 h 53 min | 31.1° |
| February | 06:54 | 12:24 | 17:53 | 10 h 59 min | 40.5° |
| March | 06:13 | 12:17 | 18:22 | 12 h 10 min | 51.2° |
| April | 05:26 | 12:09 | 18:53 | 13 h 27 min | 62.9° |
| May | 04:53 | 12:07 | 19:21 | 14 h 28 min | 71.2° |
| June | 04:44 | 12:12 | 19:39 | 14 h 54 min | 74.5° |
| July | 05:01 | 12:16 | 19:31 | 14 h 30 min | 71.5° |
| August | 05:28 | 12:13 | 18:57 | 13 h 29 min | 63.1° |
| September | 05:56 | 12:03 | 18:09 | 12 h 13 min | 51.7° |
| October | 06:25 | 11:54 | 17:24 | 10 h 58 min | 40.4° |
| November | 06:59 | 11:56 | 16:52 | 9 h 53 min | 31.1° |
| December | 07:25 | 12:08 | 16:51 | 9 h 26 min | 27.6° |
A year of daylight in Xianshuigu
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 Xianshuigu
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
37°collects the most energy over a year: 1422 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 | November kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1183 | 83% | 1.99 | 2.8× |
| 15° | 1335 | 94% | 2.67 | 1.9× |
| 30° | 1413 | 99% | 3.18 | 1.5× |
| 37° year-round best | 1422 | 100% | 3.35 | 1.4× |
| 39° = latitude | 1422 | 100% | 3.39 | 1.4× |
| 40° off-grid best | 1421 | 100% | 3.41 | 1.4× |
| 45° | 1412 | 99% | 3.49 | 1.4× |
| 60° | 1333 | 94% | 3.58 | 1.6× |
| 70° | 1240 | 87% | 3.52 | 1.8× |
| 90° | 972 | 68% | 3.10 | 2.6× |
A fixed array in Xianshuigu produces the most over a year at 37°. The design month for an off-grid system is November: at 40° it makes 3.41 kWh per kWp a day, 2% more than at 37°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Xianshuigu at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 37° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 37° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.33 | 4.47 | 4.10 | 3.61 | -3.8 °C |
| February snow | 3.03 | 4.34 | 3.94 | 3.87 | -0.7 °C |
| March | 4.43 | 4.79 | 4.24 | 4.77 | 5.5 °C |
| April | 5.26 | 4.19 | 3.59 | 4.66 | 13.4 °C |
| May | 5.88 | 3.73 | 3.09 | 4.54 | 20.6 °C |
| June | 5.30 | 3.14 | 2.54 | 3.85 | 25.1 °C |
| July | 4.78 | 2.98 | 2.39 | 3.50 | 27.2 °C |
| August | 4.65 | 3.36 | 2.73 | 3.70 | 25.9 °C |
| September | 4.16 | 3.88 | 3.23 | 3.86 | 21.1 °C |
| October | 3.24 | 4.02 | 3.45 | 3.65 | 13.4 °C |
| November | 2.42 | 3.96 | 3.52 | 3.35 | 4.5 °C |
| December snow | 2.09 | 4.37 | 3.99 | 3.43 | -2.2 °C |
| Year | 3.97 avg | 3.93 avg | 1240 kWh | 1422 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 490 Wp of panels at 70°, versus 350 Wp at 37°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Xianshuigu
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.
4.8 mrow pitch at 70°
4.2 mrow pitch at 37°
How Xianshuigu compares in China
Against the other 2,094 places in China with climate data, for a fixed array at its best angle.
627thof 2,095 places in China for sunshine, shared: 3.97 peak sun hours a day on flat ground.
+13%solar energy a year compared with the average place in China: 1,422 against 1,262 kWh per kWp.
+44 mindaylight on the longest day, compared with Shanghai: 14 h 54 min against 14 h 11 min.
37°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); Xianshuigu ranks joint 627th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.39 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 9 h 26 min, −41 min compared with Shanghai.
Solar forecast for Xianshuigu, 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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Places near Xianshuigu
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A free, live card for Xianshuigu: 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.