Can Tho City · Vietnam · 10.07° N · 105.56° E
Solar position in Thới Lai
Sun position, daylight and the best solar panel angle for Thới Lai — computed for 10.07° N, 105.56° E, 6 m above sea level.
The sun right now
Sun in Thới Lai today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:36 | sun 18° below horizon |
| Nautical dawn | 05:00 | 12° below |
| Civil dawn | 05:25 | 6° below |
| Sunrise | 05:47 | 102° ESE |
| Golden hour ends | 06:15 | sun 6° up |
| Solar noon | 11:41 | 67.8° high |
| Golden hour starts | 17:08 | sun 6° up |
| Sunset | 17:36 | 258° WSW |
| Civil dusk | 17:57 | 6° below |
| Nautical dusk | 18:22 | 12° below |
| Astronomical dusk | 18:47 | 18° below |
| Day length | 11 h 49 min | |
Sun path diagram for Thới Lai
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 76.6° at solar noon in Thới Lai; on the December solstice only 56.5°. 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 | 06:20 | 12:09 | 17:57 | 11 h 38 min | 60.0° |
| February | 06:15 | 12:11 | 18:07 | 11 h 52 min | 69.4° |
| March | 06:01 | 12:05 | 18:08 | 12 h 07 min | 80.2° |
| April | 05:44 | 11:56 | 18:08 | 12 h 24 min | 88.2° |
| May | 05:35 | 11:54 | 18:12 | 12 h 37 min | 79.9° |
| June | 05:38 | 11:59 | 18:20 | 12 h 43 min | 76.6° |
| July | 05:45 | 12:04 | 18:22 | 12 h 38 min | 79.6° |
| August | 05:48 | 12:01 | 18:13 | 12 h 24 min | 88.0° |
| September | 05:47 | 11:50 | 17:54 | 12 h 08 min | 80.6° |
| October | 05:46 | 11:42 | 17:38 | 11 h 51 min | 69.2° |
| November | 05:54 | 11:43 | 17:32 | 11 h 38 min | 60.0° |
| December | 06:09 | 11:55 | 17:41 | 11 h 32 min | 56.5° |
A year of daylight in Thới Lai
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 Thới Lai
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
10°collects the most energy over a year: 1472 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° | 1453 | 99% | 3.71 | 1.3× |
| 1° off-grid best | 1457 | 99% | 3.70 | 1.2× |
| 10° year-round best = latitude | 1472 | 100% | 3.56 | 1.3× |
| 15° | 1469 | 100% | 3.45 | 1.4× |
| 30° | 1406 | 95% | 3.01 | 1.6× |
| 45° | 1268 | 86% | 2.42 | 1.9× |
| 60° | 1067 | 72% | 1.75 | 2.5× |
| 70° | 909 | 62% | 1.33 | 3.0× |
| 90° | 624 | 42% | 1.07 | 2.7× |
A fixed array in Thới Lai produces the most over a year at 10°. The design month for an off-grid system is July: at 1° it makes 3.70 kWh per kWp a day, 4% more than at 10°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Thới Lai at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 10° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 10° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.97 | 4.69 | 3.83 | 4.25 | 26.2 °C |
| February | 5.59 | 4.42 | 3.58 | 4.64 | 27.6 °C |
| March | 5.87 | 3.62 | 2.91 | 4.69 | 29.3 °C |
| April | 5.87 | 2.53 | 2.00 | 4.52 | 30.4 °C |
| May | 5.22 | 1.81 | 1.41 | 3.94 | 29.3 °C |
| June | 4.85 | 1.62 | 1.26 | 3.64 | 27.8 °C |
| July | 4.70 | 1.69 | 1.33 | 3.56 | 27.1 °C |
| August | 4.76 | 2.06 | 1.63 | 3.68 | 27.0 °C |
| September | 4.69 | 2.66 | 2.14 | 3.72 | 26.9 °C |
| October | 4.69 | 3.36 | 2.73 | 3.84 | 26.8 °C |
| November | 4.74 | 4.18 | 3.41 | 4.00 | 26.5 °C |
| December | 4.65 | 4.53 | 3.71 | 3.99 | 25.8 °C |
| Year | 5.05 avg | 3.09 avg | 909 kWh | 1472 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 930 Wp of panels at 70°, versus 330 Wp at 10°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Thới Lai
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°
2.2 mrow pitch at 10°
How Thới Lai 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.
+11%solar energy a year compared with the average place in Vietnam: 1,472 against 1,320 kWh per kWp.
−3 mindaylight on the longest day, compared with Ho Chi Minh City: 12 h 43 min against 12 h 46 min.
10°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); Thới Lai ranks joint 99th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.26 kWh a day here, against 1.53 kWh on average in Vietnam. The shortest day lasts 11 h 32 min, +3 min compared with Ho Chi Minh City.
Solar forecast for Thới Lai, 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 Thới Lai
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A free, live card for Thới Lai: 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.