Hong Kong · 22.45° N · 114.03° E
Solar position in Yuen Long
Sun position, daylight and the best solar panel angle for Yuen Long — computed for 22.45° N, 114.03° E, 21 m above sea level.
The sun right now
Sun in Yuen Long today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:09 | sun 18° below horizon |
| Nautical dawn | 05:35 | 12° below |
| Civil dawn | 06:01 | 6° below |
| Sunrise | 06:24 | 103° ESE |
| Golden hour ends | 06:55 | sun 6° up |
| Solar noon | 12:07 | 55.5° high |
| Golden hour starts | 17:20 | sun 6° up |
| Sunset | 17:51 | 257° WSW |
| Civil dusk | 18:14 | 6° below |
| Nautical dusk | 18:40 | 12° below |
| Astronomical dusk | 19:06 | 18° below |
| Day length | 11 h 27 min | |
Sun path diagram for Yuen Long
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 89.0° at solar noon in Yuen Long; on the December solstice only 44.1°. Sunrise swings from 64° ENE in June to 115° ESE in December — a 51° 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 | 07:05 | 12:35 | 18:04 | 10 h 59 min | 47.7° |
| February | 06:51 | 12:37 | 18:23 | 11 h 32 min | 57.0° |
| March | 06:27 | 12:31 | 18:35 | 12 h 08 min | 67.8° |
| April | 05:59 | 12:22 | 18:46 | 12 h 47 min | 79.4° |
| May | 05:41 | 12:20 | 18:59 | 13 h 18 min | 87.7° |
| June | 05:40 | 12:25 | 19:10 | 13 h 31 min | 89.0° |
| July | 05:50 | 12:30 | 19:09 | 13 h 19 min | 88.0° |
| August | 06:03 | 12:27 | 18:50 | 12 h 48 min | 79.7° |
| September | 06:12 | 12:16 | 18:21 | 12 h 09 min | 68.3° |
| October | 06:22 | 12:08 | 17:54 | 11 h 31 min | 56.9° |
| November | 06:40 | 12:09 | 17:39 | 10 h 59 min | 47.7° |
| December | 06:58 | 12:21 | 17:44 | 10 h 46 min | 44.1° |
A year of daylight in Yuen Long
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 Yuen Long
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: 1252 kWh per kWp.
21°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 | February kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1196 | 96% | 2.54 | 1.7× |
| 15° | 1249 | 100% | 2.79 | 1.5× |
| 19° year-round best | 1252 | 100% | 2.84 | 1.4× |
| 21° off-grid best | 1251 | 100% | 2.85 | 1.4× |
| 22° = latitude | 1251 | 100% | 2.86 | 1.4× |
| 30° | 1235 | 99% | 2.90 | 1.4× |
| 45° | 1155 | 92% | 2.85 | 1.4× |
| 60° | 1015 | 81% | 2.64 | 1.7× |
| 70° | 895 | 71% | 2.43 | 2.0× |
| 90° | 628 | 50% | 1.85 | 2.5× |
A fixed array in Yuen Long produces the most over a year at 19°. The design month for an off-grid system is February: at 21° it makes 2.85 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Yuen Long at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 19° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 19° | Mean temp. |
|---|---|---|---|---|---|
| January | 3.06 | 3.44 | 2.92 | 2.97 | 16.0 °C |
| February | 3.14 | 2.90 | 2.43 | 2.84 | 17.8 °C |
| March | 3.37 | 2.57 | 2.12 | 2.85 | 20.2 °C |
| April | 3.92 | 2.42 | 1.96 | 3.13 | 23.3 °C |
| May | 4.62 | 2.29 | 1.83 | 3.50 | 26.3 °C |
| June | 4.76 | 2.14 | 1.69 | 3.51 | 28.0 °C |
| July | 5.47 | 2.36 | 1.87 | 4.04 | 28.6 °C |
| August | 5.11 | 2.74 | 2.18 | 3.94 | 28.5 °C |
| September | 4.73 | 3.29 | 2.65 | 3.87 | 27.6 °C |
| October | 4.39 | 3.93 | 3.22 | 3.88 | 25.0 °C |
| November | 3.60 | 3.97 | 3.30 | 3.43 | 21.6 °C |
| December | 3.16 | 3.82 | 3.24 | 3.15 | 17.1 °C |
| Year | 4.12 avg | 2.99 avg | 895 kWh | 1252 kWh |
Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 700 Wp of panels at 70°, versus 420 Wp at 19°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Yuen Long
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.
2.8 mrow pitch at 70°
2.6 mrow pitch at 19°
How Yuen Long compares in Hong Kong
Against the other 135 places in Hong Kong with climate data, for a fixed array at its best angle.
118thof 136 places in Hong Kong for sunshine, shared: 4.12 peak sun hours a day on flat ground.
±0%solar energy a year compared with the average place in Hong Kong: 1,252 against 1,255 kWh per kWp.
+1 mindaylight on the longest day, compared with Hong Kong: 13 h 31 min against 13 h 30 min.
19°best year-round tilt here; across Hong Kong it runs from 18° in Shek O to 20° in Fanling.
Of the 136 places in Hong Kong, Shek O and one other place get the most sun (4.16 peak sun hours a day) and Sheung Shui and one other place the least (4.11); Yuen Long ranks joint 118th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.69 kWh a day here, against 1.69 kWh on average in Hong Kong. The shortest day lasts 10 h 46 min, −1 min compared with Hong Kong.
Solar forecast for Yuen Long, 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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Questions about the sun in Yuen Long
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A free, live card for Yuen Long: 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.