Tuen Mun · Hong Kong · 22.38° N · 113.98° E
Solar position in Sam Shing
Sun position, daylight and the best solar panel angle for Sam Shing — computed for 22.38° N, 113.98° E, 1 m above sea level.
The sun right now
Sun in Sam Shing 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 | 12:08 | 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 Sam Shing
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 88.9° at solar noon in Sam Shing; on the December solstice only 44.2°. 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 | 18:05 | 10 h 59 min | 47.7° |
| February | 06:51 | 12:37 | 18:23 | 11 h 32 min | 57.1° |
| March | 06:27 | 12:31 | 18:35 | 12 h 08 min | 67.9° |
| April | 05:59 | 12:22 | 18:46 | 12 h 47 min | 79.5° |
| May | 05:42 | 12:20 | 18:59 | 13 h 17 min | 87.8° |
| June | 05:40 | 12:25 | 19:11 | 13 h 30 min | 88.9° |
| July | 05:51 | 12:30 | 19:09 | 13 h 19 min | 88.1° |
| August | 06:03 | 12:27 | 18:51 | 12 h 48 min | 79.7° |
| September | 06:12 | 12:17 | 18:21 | 12 h 09 min | 68.3° |
| October | 06:22 | 12:08 | 17:54 | 11 h 32 min | 56.9° |
| November | 06:40 | 12:09 | 17:39 | 10 h 59 min | 47.7° |
| December | 06:59 | 12:21 | 17:44 | 10 h 46 min | 44.2° |
A year of daylight in Sam Shing
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 Sam Shing
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: 1251 kWh per kWp.
23°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° | 1197 | 96% | 2.54 | 1.8× |
| 15° | 1249 | 100% | 2.79 | 1.5× |
| 19° year-round best | 1251 | 100% | 2.83 | 1.4× |
| 22° = latitude | 1250 | 100% | 2.85 | 1.4× |
| 23° off-grid best | 1249 | 100% | 2.86 | 1.4× |
| 30° | 1234 | 99% | 2.89 | 1.4× |
| 45° | 1153 | 92% | 2.84 | 1.4× |
| 60° | 1013 | 81% | 2.64 | 1.6× |
| 70° | 892 | 71% | 2.43 | 1.9× |
| 90° | 625 | 50% | 1.85 | 2.5× |
A fixed array in Sam Shing produces the most over a year at 19°. The design month for an off-grid system is February: at 23° it makes 2.86 kWh per kWp a day, 1% more than at 19°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Sam Shing 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 | 3.04 | 3.40 | 2.88 | 2.95 | 16.2 °C |
| February | 3.14 | 2.90 | 2.43 | 2.83 | 17.9 °C |
| March | 3.38 | 2.57 | 2.12 | 2.86 | 20.3 °C |
| April | 3.95 | 2.43 | 1.97 | 3.15 | 23.4 °C |
| May | 4.65 | 2.30 | 1.84 | 3.53 | 26.3 °C |
| June | 4.79 | 2.14 | 1.69 | 3.53 | 28.0 °C |
| July | 5.48 | 2.36 | 1.87 | 4.05 | 28.6 °C |
| August | 5.11 | 2.74 | 2.18 | 3.94 | 28.5 °C |
| September | 4.74 | 3.29 | 2.65 | 3.87 | 27.6 °C |
| October | 4.38 | 3.91 | 3.20 | 3.87 | 25.0 °C |
| November | 3.59 | 3.94 | 3.28 | 3.41 | 21.7 °C |
| December | 3.14 | 3.78 | 3.20 | 3.12 | 17.3 °C |
| Year | 4.12 avg | 2.98 avg | 892 kWh | 1251 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 Sam Shing
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 Sam Shing 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: 1,251 against 1,255 kWh per kWp.
±0 mindaylight on the longest day, compared with Hong Kong: 13 h 30 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); Sam Shing 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, ±0 min compared with Hong Kong.
Solar forecast for Sam Shing, 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 Sam Shing
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Places near Sam Shing
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A free, live card for Sam Shing: 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.