Solarposition.org

Chongqing · China · 29.05° N · 106.74° E

Solar position in Sanjiao

Sun position, daylight and the best solar panel angle for Sanjiao — computed for 29.05° N, 106.74° E, 274 m above sea level.

Sunrise today07:00103° ESE
Sunset today18:13257° WSW
Best panel angle19°year-round, facing south
Off-grid angle45°best for the darkest month

The sun right now

Azimuth180.0°
Elevation48.9°
At solar noon, 12:36Open on the sun map

Sun in Sanjiao today

Sunday, 25 October 2026 · local time UTC+8

EventTimeDirection / height
Astronomical dawn05:40sun 18° below horizon
Nautical dawn06:0812° below
Civil dawn06:366° below
Sunrise07:00103° ESE
Golden hour ends07:32sun 6° up
Solar noon12:3648.9° high
Golden hour starts17:41sun 6° up
Sunset18:13257° WSW
Civil dusk18:376° below
Nautical dusk19:0512° below
Astronomical dusk19:3318° below
Day length11 h 13 min

Sun path diagram for Sanjiao

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 solstice78910111213141516171819EquinoxDecember solstice891011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 84.4° at solar noon in Sanjiao; on the December solstice only 37.5°. Sunrise swings from 62° ENE in June to 117° ESE in December — a 54° 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
January07:4613:0418:2210 h 36 min41.1°
February07:2613:0618:4611 h 20 min50.4°
March06:5613:0019:0412 h 08 min61.2°
April06:2112:5119:2213 h 01 min72.8°
May05:5812:4919:4113 h 43 min81.1°
June05:5412:5419:5414 h 00 min84.4°
July06:0712:5919:5113 h 44 min81.4°
August06:2412:5619:2713 h 02 min73.1°
September06:4012:4618:5112 h 11 min61.7°
October06:5712:3718:1711 h 20 min50.3°
November07:2012:3817:5610 h 36 min41.1°
December07:4212:5017:5910 h 17 min37.5°

A year of daylight in Sanjiao

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 Sanjiao

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

19°collects the most energy over a year: 907 kWh per kWp.

45°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 19°Best worst-month 45°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°87296%1.123.5×
15°906100%1.303.0×
19° year-round best907100%1.342.8×
29° = latitude89699%1.412.6×
30°89499%1.422.6×
45° off-grid best83792%1.462.2×
60°73982%1.421.9×
70°65572%1.361.7×
90°46151%1.141.5×

A fixed array in Sanjiao produces the most over a year at 19°. The design month for an off-grid system is December: at 45° it makes 1.46 kWh per kWp a day, 9% more than at 19°, and costs 8% of the yearly total. Why steep panels win winter.

Off-grid solar in Sanjiao at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 19° (year-round best).

012345January: 1.40 (70°)1.4JanFebruary: 1.66 (70°)1.7FebMarch: 1.99 (70°)2.0MarApril: 2.02 (70°)2.0AprMay: 1.76 (70°)1.8MayJune: 1.60 (70°)1.6JunJuly: 2.10 (70°)2.1JulAugust: 2.35 (70°)2.3AugSeptember: 2.08 (70°)2.1SepOctober: 1.60 (70°)1.6OctNovember: 1.62 (70°)1.6NovDecember: 1.36 (70°)1.4Dec19°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 19°Mean temp.
January1.511.621.401.444.7 °C
February2.031.931.661.877.6 °C
March2.832.351.992.5012.3 °C
April3.562.432.022.9617.3 °C
May3.742.161.762.9520.9 °C
June3.732.001.602.8623.6 °C
July4.942.622.103.7926.2 °C
August4.712.902.353.7525.7 °C
September3.322.542.082.7922.0 °C
October2.101.931.601.8616.9 °C
November1.751.911.621.6611.7 °C
December1.381.571.361.346.0 °C
Year2.97 avg2.16 avg655 kWh907 kWh

Sizing example. To run a 1 kWh-per-day load through December on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 870 Wp of panels at 70°, versus 880 Wp at 19°. The steep array is 1% smaller for the same winter. Size your own system.

Row spacing in Sanjiao

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.

3.4 mrow pitch at 70°

2.8 mrow pitch at 19°

Row spacing calculator

How Sanjiao compares in China

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

2015thof 2,095 places in China for sunshine, shared: 2.97 peak sun hours a day on flat ground.

−28%solar energy a year compared with the average place in China: 907 against 1,262 kWh per kWp.

−11 mindaylight on the longest day, compared with Shanghai: 14 h 00 min against 14 h 11 min.

19°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); Sanjiao ranks joint 2015th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.36 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 10 h 17 min, +10 min compared with Shanghai.

The sunniest places in China

Solar forecast for Sanjiao, 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 Sanjiao

What is the best solar panel angle in Sanjiao?
For a fixed array facing south, the best year-round tilt in Sanjiao is 19°, worth about 907 kWh per kWp a year. An off-grid system that has to get through December does better at about 45°.
What time is sunrise and sunset in Sanjiao today?
On 25 October 2026 the sun rises at 07:00 and sets at 18:13 local time (UTC+8), giving 11 h 13 min of daylight. Solar noon is at 12:36.
How many peak sun hours does Sanjiao get?
On a flat surface 3.0 hours a day averaged over the year, from 1.4 in December to 4.9 in July. Panels tilted at 70° receive 1.6 sun hours a day in December.
How high does the sun get in Sanjiao?
At solar noon the sun stands 84.4° above the horizon on the June solstice and 37.5° on the December solstice.
Is Sanjiao a good place for solar panels?
With 3.0 peak sun hours a day on flat ground, Sanjiao ranks joint 2015th of 2,095 places in China for sunshine. A 1 kWp array at the best angle (19°) makes about 907 kWh a year here, 28% less than the average place in China.

Places near Sanjiao

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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.