Khanh Hoa · Vietnam · 12.77° N · 109.30° E
Solar position in Tu Bông
Sun position, daylight and the best solar panel angle for Tu Bông — computed for 12.77° N, 109.30° E, 4 m above sea level.
The sun right now
Sun in Tu Bông today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:22 | sun 18° below horizon |
| Nautical dawn | 04:47 | 12° below |
| Civil dawn | 05:12 | 6° below |
| Sunrise | 05:34 | 102° ESE |
| Golden hour ends | 06:03 | sun 6° up |
| Solar noon | 11:26 | 65.1° high |
| Golden hour starts | 16:50 | sun 6° up |
| Sunset | 17:19 | 258° WSW |
| Civil dusk | 17:40 | 6° below |
| Nautical dusk | 18:05 | 12° below |
| Astronomical dusk | 18:30 | 18° below |
| Day length | 11 h 45 min | |
Sun path diagram for Tu Bông
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 79.3° at solar noon in Tu Bông; on the December solstice only 53.8°. 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 | 06:09 | 11:54 | 17:38 | 11 h 30 min | 57.3° |
| February | 06:02 | 11:56 | 17:50 | 11 h 48 min | 66.7° |
| March | 05:46 | 11:50 | 17:53 | 12 h 07 min | 77.5° |
| April | 05:27 | 11:41 | 17:55 | 12 h 29 min | 89.1° |
| May | 05:16 | 11:39 | 18:02 | 12 h 46 min | 82.6° |
| June | 05:18 | 11:44 | 18:10 | 12 h 53 min | 79.3° |
| July | 05:26 | 11:49 | 18:12 | 12 h 46 min | 82.3° |
| August | 05:31 | 11:46 | 18:00 | 12 h 29 min | 89.3° |
| September | 05:31 | 11:35 | 17:39 | 12 h 08 min | 77.9° |
| October | 05:33 | 11:27 | 17:21 | 11 h 47 min | 66.6° |
| November | 05:43 | 11:28 | 17:13 | 11 h 30 min | 57.3° |
| December | 05:59 | 11:40 | 17:22 | 11 h 23 min | 53.8° |
A year of daylight in Tu Bông
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 Tu Bông
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
9°collects the most energy over a year: 1476 kWh per kWp.
36°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 | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1460 | 99% | 2.66 | 1.8× |
| 9° year-round best | 1476 | 100% | 2.88 | 1.7× |
| 13° = latitude | 1474 | 100% | 2.95 | 1.6× |
| 15° | 1471 | 100% | 2.99 | 1.6× |
| 30° | 1400 | 95% | 3.15 | 1.4× |
| 36° off-grid best | 1350 | 91% | 3.17 | 1.4× |
| 45° | 1253 | 85% | 3.14 | 1.6× |
| 60° | 1041 | 71% | 2.95 | 2.1× |
| 70° | 876 | 59% | 2.74 | 2.6× |
| 90° | 586 | 40% | 2.12 | 2.5× |
A fixed array in Tu Bông produces the most over a year at 9°. The design month for an off-grid system is December: at 36° it makes 3.17 kWh per kWp a day, 10% more than at 9°, and costs 9% of the yearly total. Why steep panels win winter.
Off-grid solar in Tu Bông at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 9° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 9° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.06 | 3.99 | 3.29 | 3.50 | 23.3 °C |
| February | 5.11 | 4.29 | 3.53 | 4.33 | 23.9 °C |
| March | 5.69 | 3.68 | 3.00 | 4.65 | 25.5 °C |
| April | 6.21 | 2.76 | 2.22 | 4.87 | 27.3 °C |
| May | 6.03 | 1.98 | 1.56 | 4.60 | 28.3 °C |
| June | 5.70 | 1.72 | 1.34 | 4.30 | 28.2 °C |
| July | 5.55 | 1.84 | 1.45 | 4.22 | 27.9 °C |
| August | 5.48 | 2.29 | 1.82 | 4.25 | 27.9 °C |
| September | 5.22 | 3.02 | 2.43 | 4.16 | 27.6 °C |
| October | 4.39 | 3.29 | 2.67 | 3.61 | 26.5 °C |
| November | 3.80 | 3.49 | 2.85 | 3.21 | 25.5 °C |
| December | 3.36 | 3.34 | 2.74 | 2.88 | 24.0 °C |
| Year | 5.05 avg | 2.97 avg | 876 kWh | 1476 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 880 Wp of panels at 70°, versus 410 Wp at 9°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Tu Bông
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.
2.2 mrow pitch at 70°
2.2 mrow pitch at 9°
How Tu Bông compares in Vietnam
Against the other 306 places in Vietnam with climate data, for a fixed array at its best angle.
99thof 307 places in Vietnam for sunshine, shared: 5.05 peak sun hours a day on flat ground.
+12%solar energy a year compared with the average place in Vietnam: 1,476 against 1,320 kWh per kWp.
+7 mindaylight on the longest day, compared with Ho Chi Minh City: 12 h 53 min against 12 h 46 min.
9°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); Tu Bông ranks joint 99th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.34 kWh a day here, against 1.53 kWh on average in Vietnam. The shortest day lasts 11 h 23 min, −7 min compared with Ho Chi Minh City.
Solar forecast for Tu Bông, 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 Tu Bông
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A free, live card for Tu Bông: 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.