Shaanxi · China · 35.07° N · 109.08° E
Solar position in Tongchuanshi
Sun position, daylight and the best solar panel angle for Tongchuanshi — computed for 35.07° N, 109.08° E, 834 m above sea level.
The sun right now
Sun in Tongchuanshi today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:33 | sun 18° below horizon |
| Nautical dawn | 06:02 | 12° below |
| Civil dawn | 06:32 | 6° below |
| Sunrise | 06:57 | 104° ESE |
| Golden hour ends | 07:32 | sun 6° up |
| Solar noon | 12:27 | 42.8° high |
| Golden hour starts | 17:22 | sun 6° up |
| Sunset | 17:57 | 256° WSW |
| Civil dusk | 18:22 | 6° below |
| Nautical dusk | 18:52 | 12° below |
| Astronomical dusk | 19:22 | 18° below |
| Day length | 10 h 59 min | |
Sun path diagram for Tongchuanshi
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 78.4° at solar noon in Tongchuanshi; on the December solstice only 31.5°. 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 | 07:49 | 12:55 | 18:00 | 10 h 11 min | 35.0° |
| February | 07:23 | 12:57 | 18:31 | 11 h 08 min | 44.4° |
| March | 06:46 | 12:51 | 18:55 | 12 h 09 min | 55.2° |
| April | 06:04 | 12:42 | 19:20 | 13 h 16 min | 66.8° |
| May | 05:36 | 12:40 | 19:44 | 14 h 09 min | 75.1° |
| June | 05:29 | 12:45 | 20:01 | 14 h 31 min | 78.4° |
| July | 05:44 | 12:50 | 19:55 | 14 h 11 min | 75.4° |
| August | 06:07 | 12:46 | 19:25 | 13 h 18 min | 67.0° |
| September | 06:30 | 12:36 | 18:42 | 12 h 12 min | 55.6° |
| October | 06:54 | 12:28 | 18:01 | 11 h 07 min | 44.2° |
| November | 07:23 | 12:29 | 17:34 | 10 h 11 min | 35.0° |
| December | 07:47 | 12:41 | 17:35 | 9 h 48 min | 31.5° |
A year of daylight in Tongchuanshi
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 Tongchuanshi
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
32°collects the most energy over a year: 1349 kWh per kWp.
30°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 | September kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1186 | 88% | 2.94 | 2.2× |
| 15° | 1302 | 97% | 3.18 | 1.6× |
| 30° off-grid best | 1348 | 100% | 3.25 | 1.3× |
| 32° year-round best | 1349 | 100% | 3.24 | 1.3× |
| 35° = latitude | 1347 | 100% | 3.23 | 1.3× |
| 45° | 1321 | 98% | 3.14 | 1.3× |
| 60° | 1222 | 91% | 2.86 | 1.4× |
| 70° | 1121 | 83% | 2.59 | 1.6× |
| 90° | 853 | 63% | 1.88 | 2.5× |
A fixed array in Tongchuanshi produces the most over a year at 32°. The design month for an off-grid system is September: at 30° it makes 3.25 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Tongchuanshi at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 32° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 32° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.55 | 4.17 | 3.81 | 3.37 | -2.8 °C |
| February | 3.12 | 3.75 | 3.38 | 3.54 | 0.7 °C |
| March | 4.17 | 4.02 | 3.54 | 4.16 | 6.5 °C |
| April | 4.98 | 3.69 | 3.16 | 4.30 | 13.0 °C |
| May | 5.42 | 3.26 | 2.72 | 4.22 | 18.1 °C |
| June | 5.51 | 3.00 | 2.45 | 4.05 | 22.7 °C |
| July | 5.18 | 2.95 | 2.40 | 3.84 | 24.4 °C |
| August | 4.54 | 3.07 | 2.51 | 3.61 | 22.9 °C |
| September | 3.62 | 3.09 | 2.59 | 3.24 | 17.6 °C |
| October | 3.13 | 3.48 | 3.00 | 3.27 | 11.6 °C |
| November | 2.66 | 3.91 | 3.47 | 3.34 | 4.5 °C |
| December snow | 2.42 | 4.23 | 3.85 | 3.40 | -1.6 °C |
| Year | 3.95 avg | 3.55 avg | 1121 kWh | 1349 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 360 Wp at 32°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Tongchuanshi
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.
4.2 mrow pitch at 70°
3.7 mrow pitch at 32°
How Tongchuanshi compares in China
Against the other 2,094 places in China with climate data, for a fixed array at its best angle.
673rdof 2,095 places in China for sunshine, shared: 3.95 peak sun hours a day on flat ground.
+7%solar energy a year compared with the average place in China: 1,349 against 1,262 kWh per kWp.
+20 mindaylight on the longest day, compared with Shanghai: 14 h 31 min against 14 h 11 min.
32°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); Tongchuanshi ranks joint 673rd. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.40 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 9 h 48 min, −19 min compared with Shanghai.
Solar forecast for Tongchuanshi, 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 Tongchuanshi
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Places near Tongchuanshi
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A free, live card for Tongchuanshi: 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.