Qinghai · China · 35.51° N · 102.02° E
Solar position in Tongren
Sun position, daylight and the best solar panel angle for Tongren — computed for 35.51° N, 102.02° E, 2506 m above sea level.
The sun right now
Sun in Tongren today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 06:01 | sun 18° below horizon |
| Nautical dawn | 06:30 | 12° below |
| Civil dawn | 07:00 | 6° below |
| Sunrise | 07:26 | 104° ESE |
| Golden hour ends | 08:01 | sun 6° up |
| Solar noon | 12:55 | 42.4° high |
| Golden hour starts | 17:49 | sun 6° up |
| Sunset | 18:24 | 256° WSW |
| Civil dusk | 18:50 | 6° below |
| Nautical dusk | 19:20 | 12° below |
| Astronomical dusk | 19:50 | 18° below |
| Day length | 10 h 58 min | |
Sun path diagram for Tongren
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 77.9° at solar noon in Tongren; on the December solstice only 31.1°. Sunrise swings from 60° ENE in June to 119° ESE in December — a 59° 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 | 08:18 | 13:23 | 18:27 | 10 h 09 min | 34.6° |
| February | 07:52 | 13:25 | 18:59 | 11 h 07 min | 43.9° |
| March | 07:14 | 13:19 | 19:24 | 12 h 09 min | 54.7° |
| April | 06:32 | 13:10 | 19:49 | 13 h 17 min | 66.4° |
| May | 06:03 | 13:08 | 20:14 | 14 h 11 min | 74.7° |
| June | 05:56 | 13:13 | 20:30 | 14 h 34 min | 77.9° |
| July | 06:11 | 13:18 | 20:24 | 14 h 13 min | 74.9° |
| August | 06:35 | 13:15 | 19:54 | 13 h 19 min | 66.6° |
| September | 06:58 | 13:04 | 19:10 | 12 h 12 min | 55.2° |
| October | 07:23 | 12:56 | 18:29 | 11 h 06 min | 43.8° |
| November | 07:52 | 12:57 | 18:02 | 10 h 09 min | 34.6° |
| December | 08:17 | 13:09 | 18:02 | 9 h 45 min | 31.1° |
A year of daylight in Tongren
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 Tongren
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
38°collects the most energy over a year: 1722 kWh per kWp.
29°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° | 1437 | 83% | 3.67 | 1.9× |
| 15° | 1616 | 94% | 3.98 | 1.4× |
| 29° off-grid best | 1705 | 99% | 4.07 | 1.3× |
| 30° | 1709 | 99% | 4.07 | 1.3× |
| 36° = latitude | 1721 | 100% | 4.05 | 1.3× |
| 38° year-round best | 1722 | 100% | 4.03 | 1.3× |
| 45° | 1712 | 99% | 3.94 | 1.4× |
| 60° | 1625 | 94% | 3.60 | 1.8× |
| 70° | 1522 | 88% | 3.26 | 2.2× |
| 90° | 1225 | 71% | 2.37 | 3.5× |
A fixed array in Tongren produces the most over a year at 38°. The design month for an off-grid system is September: at 29° it makes 4.07 kWh per kWp a day, 1% more than at 38°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Tongren at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 38° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 38° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 3.21 | 6.02 | 5.64 | 5.07 | -9.8 °C |
| February snow | 3.98 | 5.80 | 5.37 | 5.20 | -6.6 °C |
| March snow | 4.96 | 5.63 | 5.13 | 5.42 | -2.3 °C |
| April | 5.69 | 4.21 | 3.76 | 5.03 | 2.7 °C |
| May | 5.82 | 3.48 | 3.04 | 4.54 | 6.5 °C |
| June | 5.72 | 3.14 | 2.70 | 4.20 | 10.2 °C |
| July | 5.73 | 3.19 | 2.72 | 4.23 | 12.4 °C |
| August | 5.29 | 3.54 | 3.04 | 4.28 | 11.7 °C |
| September | 4.33 | 3.73 | 3.26 | 4.03 | 7.4 °C |
| October | 3.89 | 4.54 | 4.07 | 4.43 | 1.9 °C |
| November snow | 3.41 | 6.01 | 5.51 | 5.05 | -3.8 °C |
| December snow | 3.05 | 6.30 | 5.87 | 5.16 | -8.8 °C |
| Year | 4.59 avg | 4.63 avg | 1522 kWh | 1722 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 440 Wp of panels at 70°, versus 290 Wp at 38°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Tongren
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°
3.9 mrow pitch at 38°
How Tongren compares in China
Against the other 2,094 places in China with climate data, for a fixed array at its best angle.
194thof 2,095 places in China for sunshine, shared: 4.59 peak sun hours a day on flat ground.
+36%solar energy a year compared with the average place in China: 1,722 against 1,262 kWh per kWp.
+23 mindaylight on the longest day, compared with Shanghai: 14 h 34 min against 14 h 11 min.
38°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); Tongren ranks joint 194th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 2.70 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 9 h 45 min, −22 min compared with Shanghai.
Solar forecast for Tongren, 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 Tongren
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Places near Tongren
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A free, live card for Tongren: 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.