Phetchabun · Thailand · 16.19° N · 100.86° E
Solar position in Chon Daen
Sun position, daylight and the best solar panel angle for Chon Daen — computed for 16.19° N, 100.86° E, 106 m above sea level.
The sun right now
Sun in Chon Daen today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:58 | sun 18° below horizon |
| Nautical dawn | 05:23 | 12° below |
| Civil dawn | 05:49 | 6° below |
| Sunrise | 06:11 | 102° ESE |
| Golden hour ends | 06:40 | sun 6° up |
| Solar noon | 12:00 | 61.7° high |
| Golden hour starts | 17:20 | sun 6° up |
| Sunset | 17:49 | 258° WSW |
| Civil dusk | 18:11 | 6° below |
| Nautical dusk | 18:37 | 12° below |
| Astronomical dusk | 19:02 | 18° below |
| Day length | 11 h 38 min | |
Sun path diagram for Chon Daen
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 82.8° at solar noon in Chon Daen; on the December solstice only 50.4°. 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 | 06:48 | 12:27 | 18:07 | 11 h 19 min | 53.9° |
| February | 06:39 | 12:30 | 18:21 | 11 h 42 min | 63.3° |
| March | 06:20 | 12:23 | 18:27 | 12 h 07 min | 74.1° |
| April | 05:57 | 12:15 | 18:32 | 12 h 35 min | 85.7° |
| May | 05:44 | 12:13 | 18:41 | 12 h 56 min | 86.0° |
| June | 05:45 | 12:18 | 18:51 | 13 h 06 min | 82.8° |
| July | 05:54 | 12:23 | 18:51 | 12 h 57 min | 85.7° |
| August | 06:01 | 12:19 | 18:37 | 12 h 36 min | 85.9° |
| September | 06:05 | 12:09 | 18:13 | 12 h 08 min | 74.5° |
| October | 06:10 | 12:01 | 17:52 | 11 h 42 min | 63.1° |
| November | 06:22 | 12:02 | 17:41 | 11 h 19 min | 53.9° |
| December | 06:39 | 12:14 | 17:49 | 11 h 10 min | 50.4° |
A year of daylight in Chon Daen
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 Chon Daen
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
18°collects the most energy over a year: 1526 kWh per kWp.
6°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° | 1468 | 96% | 3.76 | 1.3× |
| 6° off-grid best | 1501 | 98% | 3.74 | 1.2× |
| 15° | 1525 | 100% | 3.66 | 1.2× |
| 16° = latitude | 1526 | 100% | 3.65 | 1.3× |
| 18° year-round best | 1526 | 100% | 3.62 | 1.3× |
| 30° | 1499 | 98% | 3.39 | 1.4× |
| 45° | 1391 | 91% | 2.96 | 1.7× |
| 60° | 1211 | 79% | 2.39 | 2.2× |
| 70° | 1058 | 69% | 1.96 | 2.7× |
| 90° | 741 | 49% | 1.18 | 3.1× |
A fixed array in Chon Daen produces the most over a year at 18°. The design month for an off-grid system is August: at 6° it makes 3.74 kWh per kWp a day, 3% more than at 18°, and costs 2% of the yearly total. Why steep panels win winter.
Off-grid solar in Chon Daen at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 18° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 18° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.79 | 5.23 | 4.31 | 4.50 | 24.1 °C |
| February | 5.23 | 4.65 | 3.78 | 4.58 | 27.3 °C |
| March | 5.43 | 3.78 | 3.03 | 4.42 | 29.6 °C |
| April | 5.95 | 3.03 | 2.40 | 4.54 | 31.0 °C |
| May | 5.63 | 2.32 | 1.83 | 4.14 | 29.2 °C |
| June | 5.35 | 2.11 | 1.67 | 3.89 | 27.8 °C |
| July | 5.03 | 2.17 | 1.73 | 3.71 | 27.0 °C |
| August | 4.75 | 2.45 | 1.96 | 3.62 | 26.6 °C |
| September | 4.67 | 2.96 | 2.39 | 3.73 | 26.3 °C |
| October | 4.77 | 3.80 | 3.10 | 4.06 | 25.7 °C |
| November | 4.87 | 4.99 | 4.10 | 4.49 | 24.4 °C |
| December | 4.70 | 5.47 | 4.53 | 4.54 | 23.0 °C |
| Year | 5.10 avg | 3.58 avg | 1058 kWh | 1526 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 710 Wp of panels at 70°, versus 330 Wp at 18°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Chon Daen
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.
2.4 mrow pitch at 70°
2.5 mrow pitch at 18°
How Chon Daen compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
142ndof 295 places in Thailand for sunshine, shared: 5.10 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in Thailand: 1,526 against 1,509 kWh per kWp.
+9 mindaylight on the longest day, compared with Bangkok: 13 h 06 min against 12 h 56 min.
18°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); Chon Daen ranks joint 142nd. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.67 kWh a day here, against 1.53 kWh on average in Thailand. The shortest day lasts 11 h 10 min, −9 min compared with Bangkok.
Solar forecast for Chon Daen, 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 Chon Daen
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Places near Chon Daen
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A free, live card for Chon Daen: 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.