Solarposition.org

Gansu · China · 32.75° N · 105.24° E

Solar position in Bikou

Sun position, daylight and the best solar panel angle for Bikou — computed for 32.75° N, 105.24° E, 658 m above sea level.

Sunrise today07:10104° ESE
Sunset today18:15256° WSW
Best panel angle27°year-round, facing south
Off-grid angle37°best for the darkest month

The sun right now

Azimuth180.0°
Elevation45.2°
At solar noon, 12:42Open on the sun map

Sun in Bikou today

Sunday, 25 October 2026 · local time UTC+8

EventTimeDirection / height
Astronomical dawn05:47sun 18° below horizon
Nautical dawn06:1612° below
Civil dawn06:456° below
Sunrise07:10104° ESE
Golden hour ends07:44sun 6° up
Solar noon12:4245.2° high
Golden hour starts17:41sun 6° up
Sunset18:15256° WSW
Civil dusk18:406° below
Nautical dusk19:0912° below
Astronomical dusk19:3718° below
Day length11 h 05 min

Sun path diagram for Bikou

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 solstice67891011121314151617181920EquinoxDecember solstice91011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 80.7° at solar noon in Bikou; on the December solstice only 33.8°. Sunrise swings from 61° ENE in June to 118° ESE in December — a 56° 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
January07:5913:1018:2010 h 21 min37.4°
February07:3613:1218:4911 h 13 min46.7°
March07:0213:0619:1112 h 09 min57.5°
April06:2212:5719:3313 h 10 min69.1°
May05:5612:5519:5413 h 58 min77.4°
June05:5113:0020:1014 h 19 min80.7°
July06:0513:0520:0514 h 00 min77.7°
August06:2613:0219:3713 h 11 min69.4°
September06:4612:5218:5712 h 11 min58.0°
October07:0712:4318:1911 h 12 min46.6°
November07:3412:4417:5510 h 21 min37.4°
December07:5712:5617:5610 h 00 min33.8°

A year of daylight in Bikou

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 Bikou

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: 1108 kWh per kWp.

37°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 37°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearOctober kWh/kWp/dayBest ÷ worst month
0°101291%2.022.1×
15°108898%2.251.7×
27° year-round best1108100%2.351.6×
30°1107100%2.371.5×
33° = latitude1104100%2.381.5×
37° off-grid best109699%2.381.5×
45°106896%2.361.4×
60°97588%2.231.4×
70°88580%2.071.6×
90°66060%1.632.1×

A fixed array in Bikou produces the most over a year at 27°. The design month for an off-grid system is October: at 37° it makes 2.38 kWh per kWp a day, 1% more than at 27°, and costs 1% of the yearly total. Why steep panels win winter.

Off-grid solar in Bikou at 70°

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

01234January: 3.03 (70°)3.0JanFebruary: 2.54 (70°)2.5FebMarch: 2.66 (70°)2.7MarApril: 2.62 (70°)2.6AprMay: 2.33 (70°)2.3MayJune: 2.06 (70°)2.1JunJuly: 2.07 (70°)2.1JulAugust: 2.26 (70°)2.3AugSeptember: 1.93 (70°)1.9SepOctober: 2.07 (70°)2.1OctNovember: 2.53 (70°)2.5NovDecember: 2.99 (70°)3.0Dec27°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 27°Mean temp.
January snow2.333.363.032.770.2 °C
February2.642.862.542.733.0 °C
March3.423.052.663.227.9 °C
April4.313.082.623.6813.3 °C
May4.692.802.333.7117.2 °C
June4.562.522.063.4620.7 °C
July4.502.542.073.4222.7 °C
August4.192.762.263.3521.9 °C
September2.912.321.932.4917.5 °C
October2.472.432.072.3512.3 °C
November2.252.892.532.496.7 °C
December2.203.332.992.721.3 °C
Year3.38 avg2.83 avg885 kWh1108 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 610 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 Bikou

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 Bikou compares in China

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

1493rdof 2,095 places in China for sunshine, shared: 3.38 peak sun hours a day on flat ground.

−12%solar energy a year compared with the average place in China: 1,108 against 1,262 kWh per kWp.

+8 mindaylight on the longest day, compared with Shanghai: 14 h 19 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); Bikou ranks joint 1493rd. In its darkest month, September, 1 kWp of off-grid panels at 70° makes 1.93 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 10 h 00 min, −7 min compared with Shanghai.

The sunniest places in China

Solar forecast for Bikou, 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 Bikou

What is the best solar panel angle in Bikou?
For a fixed array facing south, the best year-round tilt in Bikou is 27°, worth about 1108 kWh per kWp a year. An off-grid system that has to get through October does better at about 37°.
What time is sunrise and sunset in Bikou today?
On 25 October 2026 the sun rises at 07:10 and sets at 18:15 local time (UTC+8), giving 11 h 05 min of daylight. Solar noon is at 12:42.
How many peak sun hours does Bikou get?
On a flat surface 3.4 hours a day averaged over the year, from 2.2 in December to 4.7 in May. Panels tilted at 70° receive 2.3 sun hours a day in September.
How high does the sun get in Bikou?
At solar noon the sun stands 80.7° above the horizon on the June solstice and 33.8° on the December solstice.
Is Bikou a good place for solar panels?
With 3.4 peak sun hours a day on flat ground, Bikou ranks joint 1493rd of 2,095 places in China for sunshine. A 1 kWp array at the best angle (27°) makes about 1,108 kWh a year here, 12% less than the average place in China.

Places near Bikou

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.