An Giang · Vietnam · 10.57° N · 105.37° E
Solar position in Kiến An
Sun position, daylight and the best solar panel angle for Kiến An — computed for 10.57° N, 105.37° E, 7 m above sea level.
The sun right now
Sun in Kiến An today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:37 | sun 18° below horizon |
| Nautical dawn | 05:02 | 12° below |
| Civil dawn | 05:26 | 6° below |
| Sunrise | 05:48 | 102° ESE |
| Golden hour ends | 06:16 | sun 6° up |
| Solar noon | 11:42 | 67.3° high |
| Golden hour starts | 17:08 | sun 6° up |
| Sunset | 17:36 | 258° WSW |
| Civil dusk | 17:58 | 6° below |
| Nautical dusk | 18:23 | 12° below |
| Astronomical dusk | 18:47 | 18° below |
| Day length | 11 h 49 min | |
Sun path diagram for Kiến An
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 77.1° at solar noon in Kiến An; on the December solstice only 56.0°. Sunrise swings from 66° ENE in June to 114° ESE in December — a 48° 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 | 06:21 | 12:09 | 17:57 | 11 h 36 min | 59.5° |
| February | 06:16 | 12:12 | 18:07 | 11 h 51 min | 68.9° |
| March | 06:02 | 12:05 | 18:09 | 12 h 07 min | 79.7° |
| April | 05:44 | 11:57 | 18:09 | 12 h 25 min | 88.7° |
| May | 05:35 | 11:55 | 18:14 | 12 h 39 min | 80.4° |
| June | 05:37 | 12:00 | 18:22 | 12 h 45 min | 77.1° |
| July | 05:45 | 12:05 | 18:24 | 12 h 39 min | 80.1° |
| August | 05:49 | 12:01 | 18:14 | 12 h 25 min | 88.5° |
| September | 05:47 | 11:51 | 17:55 | 12 h 08 min | 80.1° |
| October | 05:47 | 11:43 | 17:38 | 11 h 51 min | 68.7° |
| November | 05:56 | 11:44 | 17:32 | 11 h 36 min | 59.5° |
| December | 06:11 | 11:56 | 17:41 | 11 h 31 min | 56.0° |
A year of daylight in Kiến An
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 Kiến An
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
11°collects the most energy over a year: 1494 kWh per kWp.
1°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 | July kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1473 | 99% | 3.82 | 1.2× |
| 1° off-grid best | 1477 | 99% | 3.81 | 1.2× |
| 11° year-round best = latitude | 1494 | 100% | 3.65 | 1.3× |
| 15° | 1492 | 100% | 3.56 | 1.3× |
| 30° | 1430 | 96% | 3.11 | 1.5× |
| 45° | 1293 | 87% | 2.51 | 1.8× |
| 60° | 1090 | 73% | 1.82 | 2.4× |
| 70° | 931 | 62% | 1.38 | 3.0× |
| 90° | 641 | 43% | 1.09 | 2.8× |
A fixed array in Kiến An produces the most over a year at 11°. The design month for an off-grid system is July: at 1° it makes 3.81 kWh per kWp a day, 5% more than at 11°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Kiến An at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 11° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 11° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.99 | 4.77 | 3.89 | 4.29 | 26.6 °C |
| February | 5.51 | 4.38 | 3.54 | 4.57 | 28.2 °C |
| March | 5.75 | 3.60 | 2.88 | 4.59 | 30.0 °C |
| April | 5.85 | 2.59 | 2.04 | 4.48 | 30.8 °C |
| May | 5.38 | 1.88 | 1.47 | 4.03 | 29.4 °C |
| June | 5.04 | 1.66 | 1.30 | 3.76 | 27.8 °C |
| July | 4.84 | 1.75 | 1.38 | 3.65 | 27.2 °C |
| August | 4.87 | 2.11 | 1.68 | 3.75 | 27.1 °C |
| September | 4.81 | 2.74 | 2.21 | 3.81 | 27.0 °C |
| October | 4.82 | 3.48 | 2.82 | 3.95 | 26.8 °C |
| November | 4.85 | 4.34 | 3.54 | 4.12 | 26.6 °C |
| December | 4.79 | 4.78 | 3.91 | 4.16 | 26.0 °C |
| Year | 5.12 avg | 3.17 avg | 931 kWh | 1494 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 910 Wp of panels at 70°, versus 320 Wp at 11°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Kiến An
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.
2.1 mrow pitch at 70°
2.3 mrow pitch at 11°
How Kiến An compares in Vietnam
Against the other 306 places in Vietnam with climate data, for a fixed array at its best angle.
70thof 307 places in Vietnam for sunshine, shared: 5.12 peak sun hours a day on flat ground.
+13%solar energy a year compared with the average place in Vietnam: 1,494 against 1,320 kWh per kWp.
−1 mindaylight on the longest day, compared with Ho Chi Minh City: 12 h 45 min against 12 h 46 min.
11°best year-round tilt here; across Vietnam it runs from 9° in Vĩnh Châu to 21° in Dien Bien Phu.
Of the 307 places in Vietnam, Phú Quý gets the most sun (5.45 peak sun hours a day) and Thị Trấn Thất Khê and one other place the least (3.61); Kiến An ranks joint 70th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.30 kWh a day here, against 1.53 kWh on average in Vietnam. The shortest day lasts 11 h 31 min, +1 min compared with Ho Chi Minh City.
Solar forecast for Kiến An, 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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A free, live card for Kiến An: 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.