Solarposition.org

Taiwan · Taiwan · 25.13° N · 121.74° E

Solar position in Keelung

Sun position, daylight and the best solar panel angle for Keelung — computed for 25.13° N, 121.74° E, 19 m above sea level.

Sunrise today05:56103° ESE
Sunset today17:17257° WSW
Best panel angle17°year-round, facing south
Off-grid angle42°best for the darkest month

The sun right now

Azimuth180.0°
Elevation52.8°
At solar noon, 11:37Open on the sun map

Sun in Keelung today

Sunday, 25 October 2026 · local time UTC+8

EventTimeDirection / height
Astronomical dawn04:39sun 18° below horizon
Nautical dawn05:0612° below
Civil dawn05:326° below
Sunrise05:56103° ESE
Golden hour ends06:27sun 6° up
Solar noon11:3752.8° high
Golden hour starts16:46sun 6° up
Sunset17:17257° WSW
Civil dusk17:416° below
Nautical dusk18:0712° below
Astronomical dusk18:3418° below
Day length11 h 21 min

Sun path diagram for Keelung

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 solstice6789101112131415161718EquinoxDecember solstice7891011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 88.3° at solar noon in Keelung; on the December solstice only 41.5°. Sunrise swings from 64° ENE in June to 116° ESE in December — a 52° 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
January06:3912:0417:2910 h 50 min45.0°
February06:2312:0617:5011 h 27 min54.3°
March05:5612:0018:0412 h 08 min65.1°
April05:2511:5118:1812 h 53 min76.7°
May05:0611:4918:3313 h 27 min85.0°
June05:0311:5418:4513 h 42 min88.3°
July05:1511:5918:4313 h 29 min85.3°
August05:2911:5618:2212 h 54 min77.0°
September05:4111:4617:5012 h 10 min65.6°
October05:5411:3717:2011 h 27 min54.2°
November06:1311:3817:0310 h 50 min45.0°
December06:3311:5017:0810 h 35 min41.5°

A year of daylight in Keelung

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 Keelung

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

17°collects the most energy over a year: 1132 kWh per kWp.

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

40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 17°Best worst-month 42°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°109497%1.633.0×
15°1131100%1.902.4×
17° year-round best1132100%1.932.4×
25° = latitude112399%2.032.2×
30°110998%2.072.0×
42° off-grid best104993%2.131.8×
45°102991%2.131.7×
60°89679%2.071.5×
70°78469%1.971.5×
90°53747%1.631.9×

A fixed array in Keelung produces the most over a year at 17°. The design month for an off-grid system is December: at 42° it makes 2.13 kWh per kWp a day, 10% more than at 17°, and costs 7% of the yearly total. Why steep panels win winter.

Off-grid solar in Keelung at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 17° (year-round best).

012345January: 1.93 (70°)1.9JanFebruary: 1.92 (70°)1.9FebMarch: 2.02 (70°)2.0MarApril: 1.95 (70°)2.0AprMay: 1.85 (70°)1.9MayJune: 1.86 (70°)1.9JunJuly: 2.13 (70°)2.1JulAugust: 2.46 (70°)2.5AugSeptember: 2.72 (70°)2.7SepOctober: 2.70 (70°)2.7OctNovember: 2.25 (70°)2.3NovDecember: 1.97 (70°)2.0Dec17°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 17°Mean temp.
January2.112.301.931.9616.8 °C
February2.452.301.922.1817.3 °C
March3.092.442.022.6418.7 °C
April3.702.391.953.0021.6 °C
May4.302.301.853.3424.4 °C
June5.002.341.863.7926.6 °C
July6.112.672.134.6127.9 °C
August5.563.072.464.3627.9 °C
September4.623.362.723.8326.6 °C
October3.613.302.703.1724.1 °C
November2.552.732.252.3321.7 °C
December2.062.371.971.9318.3 °C
Year3.77 avg2.63 avg784 kWh1132 kWh

Sizing example. To run a 1 kWh-per-day load through May on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 640 Wp of panels at 70°, versus 610 Wp at 17°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Keelung

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.

3.1 mrow pitch at 70°

2.7 mrow pitch at 17°

Row spacing calculator

How Keelung compares in Taiwan

Against the other 66 places in Taiwan with climate data, for a fixed array at its best angle.

60thof 67 places in Taiwan for sunshine, shared: 3.77 peak sun hours a day on flat ground.

−10%solar energy a year compared with the average place in Taiwan: 1,132 against 1,256 kWh per kWp.

±0 mindaylight on the longest day, compared with Taipei: 13 h 42 min against 13 h 42 min.

17°best year-round tilt here; across Taiwan it runs from 17° in Keelung to 21° in Chiayi City.

Of the 67 places in Taiwan, Donggang and one other place get the most sun (4.59 peak sun hours a day) and Sanzhi the least (3.74); Keelung ranks joint 60th. In its darkest month, May, 1 kWp of off-grid panels at 70° makes 1.85 kWh a day here, against 1.85 kWh on average in Taiwan. The shortest day lasts 10 h 35 min, ±0 min compared with Taipei.

The sunniest places in Taiwan

Solar forecast for Keelung, 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 Keelung

What is the best solar panel angle in Keelung?
For a fixed array facing south, the best year-round tilt in Keelung is 17°, worth about 1132 kWh per kWp a year. An off-grid system that has to get through December does better at about 42°.
What time is sunrise and sunset in Keelung today?
On 25 October 2026 the sun rises at 05:56 and sets at 17:17 local time (UTC+8), giving 11 h 21 min of daylight. Solar noon is at 11:37.
How many peak sun hours does Keelung get?
On a flat surface 3.8 hours a day averaged over the year, from 2.1 in December to 6.1 in July. Panels tilted at 70° receive 2.3 sun hours a day in May.
How high does the sun get in Keelung?
At solar noon the sun stands 88.3° above the horizon on the June solstice and 41.5° on the December solstice.
Is Keelung a good place for solar panels?
With 3.8 peak sun hours a day on flat ground, Keelung ranks joint 60th of 67 places in Taiwan for sunshine. A 1 kWp array at the best angle (17°) makes about 1,132 kWh a year here, 10% less than the average place in Taiwan.

Places near Keelung

All places in Taiwan

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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.