Kalasin · Thailand · 16.70° N · 104.09° E
Solar position in Khao Wong
Sun position, daylight and the best solar panel angle for Khao Wong — computed for 16.70° N, 104.09° E, 194 m above sea level.
The sun right now
Sun in Khao Wong today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:46 | sun 18° below horizon |
| Nautical dawn | 05:11 | 12° below |
| Civil dawn | 05:36 | 6° below |
| Sunrise | 05:58 | 102° ESE |
| Golden hour ends | 06:28 | sun 6° up |
| Solar noon | 11:47 | 61.2° high |
| Golden hour starts | 17:07 | sun 6° up |
| Sunset | 17:36 | 258° WSW |
| Civil dusk | 17:58 | 6° below |
| Nautical dusk | 18:23 | 12° below |
| Astronomical dusk | 18:49 | 18° below |
| Day length | 11 h 38 min | |
Sun path diagram for Khao Wong
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 83.3° at solar noon in Khao Wong; on the December solstice only 49.9°. Sunrise swings from 65° ENE in June to 114° ESE in December — a 49° 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 | 06:36 | 12:14 | 17:53 | 11 h 18 min | 53.4° |
| February | 06:26 | 12:17 | 18:08 | 11 h 41 min | 62.8° |
| March | 06:07 | 12:10 | 18:14 | 12 h 07 min | 73.5° |
| April | 05:44 | 12:02 | 18:20 | 12 h 36 min | 85.2° |
| May | 05:31 | 12:00 | 18:29 | 12 h 58 min | 86.5° |
| June | 05:31 | 12:05 | 18:39 | 13 h 08 min | 83.3° |
| July | 05:40 | 12:10 | 18:39 | 12 h 59 min | 86.2° |
| August | 05:48 | 12:06 | 18:25 | 12 h 36 min | 85.4° |
| September | 05:52 | 11:56 | 18:00 | 12 h 08 min | 74.0° |
| October | 05:57 | 11:48 | 17:38 | 11 h 41 min | 62.6° |
| November | 06:10 | 11:49 | 17:28 | 11 h 18 min | 53.4° |
| December | 06:27 | 12:01 | 17:35 | 11 h 08 min | 49.9° |
A year of daylight in Khao Wong
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 Khao Wong
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: 1525 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 | August kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1457 | 96% | 3.63 | 1.2× |
| 1° off-grid best | 1464 | 96% | 3.63 | 1.2× |
| 15° | 1522 | 100% | 3.54 | 1.3× |
| 17° = latitude | 1524 | 100% | 3.51 | 1.3× |
| 19° year-round best | 1525 | 100% | 3.49 | 1.4× |
| 30° | 1503 | 99% | 3.28 | 1.6× |
| 45° | 1403 | 92% | 2.86 | 1.9× |
| 60° | 1228 | 81% | 2.32 | 2.4× |
| 70° | 1078 | 71% | 1.90 | 2.8× |
| 90° | 758 | 50% | 1.13 | 3.3× |
A fixed array in Khao Wong produces the most over a year at 19°. The design month for an off-grid system is August: at 1° it makes 3.63 kWh per kWp a day, 4% more than at 19°, and costs 4% of the yearly total. Why steep panels win winter.
Off-grid solar in Khao Wong 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 | 4.92 | 5.56 | 4.61 | 4.76 | 22.3 °C |
| February | 5.27 | 4.77 | 3.91 | 4.69 | 25.3 °C |
| March | 5.28 | 3.71 | 2.99 | 4.32 | 28.4 °C |
| April | 5.72 | 2.98 | 2.37 | 4.36 | 30.2 °C |
| May | 5.53 | 2.32 | 1.84 | 4.06 | 28.9 °C |
| June | 5.17 | 2.07 | 1.64 | 3.75 | 27.4 °C |
| July | 4.78 | 2.06 | 1.64 | 3.51 | 26.6 °C |
| August | 4.58 | 2.37 | 1.90 | 3.49 | 26.3 °C |
| September | 4.66 | 2.96 | 2.40 | 3.73 | 26.3 °C |
| October | 4.99 | 4.04 | 3.31 | 4.30 | 25.1 °C |
| November | 4.87 | 5.08 | 4.20 | 4.56 | 23.5 °C |
| December | 4.73 | 5.61 | 4.67 | 4.66 | 21.5 °C |
| Year | 5.04 avg | 3.62 avg | 1078 kWh | 1525 kWh |
Sizing example. To run a 1 kWh-per-day load through July on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 720 Wp of panels at 70°, versus 340 Wp at 19°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Khao Wong
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.
2.5 mrow pitch at 70°
2.5 mrow pitch at 19°
How Khao Wong compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
180thof 295 places in Thailand for sunshine, shared: 5.04 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in Thailand: 1,525 against 1,509 kWh per kWp.
+11 mindaylight on the longest day, compared with Bangkok: 13 h 08 min against 12 h 56 min.
19°best year-round tilt here; across Thailand it runs from 4° in Narathiwat to 23° in Mae Chan.
Of the 295 places in Thailand, Bangkok and 7 other places get the most sun (5.23 peak sun hours a day) and Mae Ramat the least (4.74); Khao Wong ranks joint 180th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 1.64 kWh a day here, against 1.53 kWh on average in Thailand. The shortest day lasts 11 h 08 min, −11 min compared with Bangkok.
Solar forecast for Khao Wong, 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 Khao Wong
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A free, live card for Khao Wong: 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.