Solarposition.org

Shaanxi · China · 33.15° N · 107.33° E

Solar position in Chenggu

Sun position, daylight and the best solar panel angle for Chenggu — computed for 33.15° N, 107.33° E, 485 m above sea level.

Sunrise today07:02104° ESE
Sunset today18:06256° WSW
Best panel angle27°year-round, facing south
Off-grid angle42°best for the darkest month

The sun right now

Azimuth180.0°
Elevation44.8°
At solar noon, 12:34Open on the sun map

Sun in Chenggu today

Sunday, 25 October 2026 · local time UTC+8

EventTimeDirection / height
Astronomical dawn05:39sun 18° below horizon
Nautical dawn06:0812° below
Civil dawn06:376° below
Sunrise07:02104° ESE
Golden hour ends07:36sun 6° up
Solar noon12:3444.8° high
Golden hour starts17:32sun 6° up
Sunset18:06256° WSW
Civil dusk18:316° below
Nautical dusk19:0012° below
Astronomical dusk19:2918° below
Day length11 h 04 min

Sun path diagram for Chenggu

Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.

15°30°45°60°75°N30°60°E120°150°S210°240°W300°330°June solstice678910111213141516171819EquinoxDecember solstice891011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 80.3° at solar noon in Chenggu; on the December solstice only 33.4°. Sunrise swings from 61° ENE in June to 118° ESE in December — a 57° 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.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January07:5213:0218:1110 h 19 min37.0°
February07:2813:0418:4011 h 12 min46.3°
March06:5312:5819:0212 h 09 min57.1°
April06:1412:4919:2513 h 11 min68.7°
May05:4712:4719:4714 h 00 min77.0°
June05:4212:5220:0214 h 21 min80.3°
July05:5612:5719:5714 h 02 min77.3°
August06:1712:5319:2913 h 13 min69.0°
September06:3712:4318:4912 h 11 min57.6°
October06:5912:3518:1011 h 11 min46.2°
November07:2612:3617:4610 h 19 min37.0°
December07:4912:4817:479 h 58 min33.4°

A year of daylight in Chenggu

Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.

00:0003:0006:0009:0012:0015:0018:0021:0000:00JanFebMarAprMayJunJulAugSepOctNovDec

Best solar panel angle in Chenggu

Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.

27°collects the most energy over a year: 1115 kWh per kWp.

42°gives the most in the darkest month — the one an off-grid system is sized for.

50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 27°Best worst-month 42°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearNovember kWh/kWp/dayBest ÷ worst month
0°102192%1.752.3×
15°109698%2.131.8×
27° year-round best1115100%2.351.6×
30°1114100%2.401.6×
33° = latitude1111100%2.431.5×
42° off-grid best108697%2.511.4×
45°107496%2.521.4×
60°97888%2.501.3×
70°88779%2.401.3×
90°65859%2.032.0×

A fixed array in Chenggu produces the most over a year at 27°. The design month for an off-grid system is November: at 42° it makes 2.51 kWh per kWp a day, 6% more than at 27°, and costs 3% of the yearly total. Why steep panels win winter.

Off-grid solar in Chenggu at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 27° (year-round best).

012345January: 2.81 (70°)2.8JanFebruary: 2.38 (70°)2.4FebMarch: 2.75 (70°)2.7MarApril: 2.69 (70°)2.7AprMay: 2.33 (70°)2.3MayJune: 2.15 (70°)2.1JunJuly: 2.18 (70°)2.2JulAugust: 2.38 (70°)2.4AugSeptember: 2.08 (70°)2.1SepOctober: 2.21 (70°)2.2OctNovember: 2.40 (70°)2.4NovDecember: 2.80 (70°)2.8Dec27°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 27°Mean temp.
January snow2.183.112.812.57-0.6 °C
February2.472.682.382.552.3 °C
March3.473.152.753.307.5 °C
April4.393.162.693.7713.0 °C
May4.672.792.333.7117.3 °C
June4.802.632.153.6421.3 °C
July4.742.682.183.6023.3 °C
August4.392.912.383.5222.4 °C
September3.082.502.082.6817.5 °C
October2.542.582.212.4712.1 °C
November2.122.742.402.356.1 °C
December snow2.003.112.802.460.5 °C
Year3.41 avg2.84 avg887 kWh1115 kWh

Sizing example. To run a 1 kWh-per-day load through September on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 570 Wp of panels at 70°, versus 500 Wp at 27°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Chenggu

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.

3.9 mrow pitch at 70°

3.3 mrow pitch at 27°

Row spacing calculator

How Chenggu compares in China

Against the other 2,094 places in China with climate data, for a fixed array at its best angle.

1483rdof 2,095 places in China for sunshine, shared: 3.41 peak sun hours a day on flat ground.

−12%solar energy a year compared with the average place in China: 1,115 against 1,262 kWh per kWp.

+10 mindaylight on the longest day, compared with Shanghai: 14 h 21 min against 14 h 11 min.

27°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); Chenggu ranks joint 1483rd. In its darkest month, September, 1 kWp of off-grid panels at 70° makes 2.08 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 9 h 58 min, −9 min compared with Shanghai.

The sunniest places in China

Solar forecast for Chenggu, next 48 hours

Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.

Loading the latest forecast…

Questions about the sun in Chenggu

What is the best solar panel angle in Chenggu?
For a fixed array facing south, the best year-round tilt in Chenggu is 27°, worth about 1115 kWh per kWp a year. An off-grid system that has to get through November does better at about 42°.
What time is sunrise and sunset in Chenggu today?
On 25 October 2026 the sun rises at 07:02 and sets at 18:06 local time (UTC+8), giving 11 h 04 min of daylight. Solar noon is at 12:34.
How many peak sun hours does Chenggu get?
On a flat surface 3.4 hours a day averaged over the year, from 2.0 in December to 4.8 in June. Panels tilted at 70° receive 2.5 sun hours a day in September.
How high does the sun get in Chenggu?
At solar noon the sun stands 80.3° above the horizon on the June solstice and 33.4° on the December solstice.
Is Chenggu a good place for solar panels?
With 3.4 peak sun hours a day on flat ground, Chenggu ranks joint 1483rd of 2,095 places in China for sunshine. A 1 kWp array at the best angle (27°) makes about 1,115 kWh a year here, 12% less than the average place in China.

Places near Chenggu

All places in China

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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.