Shandong · China · 36.45° N · 118.86° E
Solar position in Tangwu
Sun position, daylight and the best solar panel angle for Tangwu — computed for 36.45° N, 118.86° E, 149 m above sea level.
The sun right now
Sun in Tangwu today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:54 | sun 18° below horizon |
| Nautical dawn | 05:24 | 12° below |
| Civil dawn | 05:54 | 6° below |
| Sunrise | 06:20 | 104° ESE |
| Golden hour ends | 06:56 | sun 6° up |
| Solar noon | 11:48 | 41.5° high |
| Golden hour starts | 16:40 | sun 6° up |
| Sunset | 17:16 | 255° WSW |
| Civil dusk | 17:42 | 6° below |
| Nautical dusk | 18:12 | 12° below |
| Astronomical dusk | 18:42 | 18° below |
| Day length | 10 h 56 min | |
Sun path diagram for Tangwu
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 77.0° at solar noon in Tangwu; on the December solstice only 30.1°. 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 | 07:13 | 12:15 | 17:18 | 10 h 05 min | 33.7° |
| February | 06:45 | 12:18 | 17:50 | 11 h 05 min | 43.0° |
| March | 06:07 | 12:11 | 18:16 | 12 h 09 min | 53.8° |
| April | 05:23 | 12:03 | 18:43 | 13 h 20 min | 65.4° |
| May | 04:53 | 12:01 | 19:08 | 14 h 15 min | 73.7° |
| June | 04:46 | 12:06 | 19:25 | 14 h 39 min | 77.0° |
| July | 05:02 | 12:10 | 19:19 | 14 h 17 min | 74.0° |
| August | 05:26 | 12:07 | 18:48 | 13 h 21 min | 65.7° |
| September | 05:51 | 11:57 | 18:03 | 12 h 12 min | 54.3° |
| October | 06:16 | 11:49 | 17:21 | 11 h 04 min | 42.9° |
| November | 06:47 | 11:50 | 16:52 | 10 h 05 min | 33.7° |
| December | 07:12 | 12:02 | 16:52 | 9 h 40 min | 30.1° |
A year of daylight in Tangwu
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 Tangwu
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
34°collects the most energy over a year: 1368 kWh per kWp.
39°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° | 1178 | 86% | 1.83 | 2.5× |
| 15° | 1307 | 96% | 2.53 | 1.9× |
| 30° | 1365 | 100% | 3.09 | 1.5× |
| 34° year-round best | 1368 | 100% | 3.21 | 1.4× |
| 36° = latitude | 1367 | 100% | 3.26 | 1.4× |
| 39° off-grid best | 1364 | 100% | 3.34 | 1.3× |
| 45° | 1348 | 99% | 3.46 | 1.4× |
| 60° | 1258 | 92% | 3.63 | 1.6× |
| 70° | 1160 | 85% | 3.63 | 1.7× |
| 90° | 893 | 65% | 3.33 | 2.5× |
A fixed array in Tangwu produces the most over a year at 34°. The design month for an off-grid system is December: at 39° it makes 3.34 kWh per kWp a day, 4% more than at 34°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Tangwu at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 34° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 34° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.39 | 4.16 | 3.80 | 3.35 | -2.4 °C |
| February snow | 3.04 | 4.04 | 3.64 | 3.63 | 0.4 °C |
| March | 4.36 | 4.40 | 3.88 | 4.48 | 6.3 °C |
| April | 5.14 | 3.91 | 3.35 | 4.49 | 13.5 °C |
| May | 5.69 | 3.49 | 2.89 | 4.40 | 20.2 °C |
| June | 5.28 | 3.02 | 2.45 | 3.85 | 24.8 °C |
| July | 4.69 | 2.83 | 2.27 | 3.45 | 26.8 °C |
| August | 4.50 | 3.13 | 2.54 | 3.55 | 25.5 °C |
| September | 4.13 | 3.65 | 3.03 | 3.73 | 21.0 °C |
| October | 3.36 | 3.90 | 3.34 | 3.59 | 14.4 °C |
| November | 2.53 | 3.81 | 3.36 | 3.24 | 6.3 °C |
| December snow | 2.20 | 4.00 | 3.63 | 3.21 | -0.7 °C |
| Year | 3.95 avg | 3.69 avg | 1160 kWh | 1368 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 520 Wp of panels at 70°, versus 370 Wp at 34°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Tangwu
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.
4.4 mrow pitch at 70°
3.9 mrow pitch at 34°
How Tangwu 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.
+8%solar energy a year compared with the average place in China: 1,368 against 1,262 kWh per kWp.
+28 mindaylight on the longest day, compared with Shanghai: 14 h 39 min against 14 h 11 min.
34°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); Tangwu ranks joint 673rd. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.27 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 9 h 40 min, −27 min compared with Shanghai.
Solar forecast for Tangwu, 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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A free, live card for Tangwu: 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.