Nakhon Ratchasima · Thailand · 14.73° N · 102.17° E
Solar position in Chok Chai
Sun position, daylight and the best solar panel angle for Chok Chai — computed for 14.73° N, 102.17° E, 195 m above sea level.
The sun right now
Sun in Chok Chai today
Saturday, 24 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:52 | sun 18° below horizon |
| Nautical dawn | 05:17 | 12° below |
| Civil dawn | 05:42 | 6° below |
| Sunrise | 06:04 | 102° ESE |
| Golden hour ends | 06:33 | sun 6° up |
| Solar noon | 11:55 | 63.5° high |
| Golden hour starts | 17:17 | sun 6° up |
| Sunset | 17:46 | 258° WSW |
| Civil dusk | 18:08 | 6° below |
| Nautical dusk | 18:33 | 12° below |
| Astronomical dusk | 18:58 | 18° below |
| Day length | 11 h 42 min | |
Sun path diagram for Chok Chai
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 81.3° at solar noon in Chok Chai; on the December solstice only 51.8°. 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 | 06:40 | 12:22 | 18:04 | 11 h 24 min | 55.4° |
| February | 06:32 | 12:25 | 18:17 | 11 h 44 min | 64.7° |
| March | 06:15 | 12:18 | 18:22 | 12 h 07 min | 75.5° |
| April | 05:54 | 12:10 | 18:26 | 12 h 32 min | 87.1° |
| May | 05:42 | 12:07 | 18:33 | 12 h 52 min | 84.5° |
| June | 05:43 | 12:13 | 18:43 | 13 h 00 min | 81.3° |
| July | 05:51 | 12:17 | 18:43 | 12 h 52 min | 84.3° |
| August | 05:58 | 12:14 | 18:30 | 12 h 33 min | 87.4° |
| September | 06:00 | 12:04 | 18:08 | 12 h 08 min | 76.0° |
| October | 06:03 | 11:55 | 17:48 | 11 h 44 min | 64.6° |
| November | 06:15 | 11:57 | 17:38 | 11 h 24 min | 55.4° |
| December | 06:31 | 12:09 | 17:46 | 11 h 15 min | 51.8° |
A year of daylight in Chok Chai
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 Chok Chai
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
16°collects the most energy over a year: 1524 kWh per kWp.
10°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° | 1476 | 97% | 3.85 | 1.2× |
| 10° off-grid best | 1517 | 100% | 3.79 | 1.2× |
| 15° = latitude | 1524 | 100% | 3.74 | 1.2× |
| 16° year-round best | 1524 | 100% | 3.72 | 1.2× |
| 30° | 1489 | 98% | 3.44 | 1.4× |
| 45° | 1374 | 90% | 2.98 | 1.8× |
| 60° | 1188 | 78% | 2.39 | 2.3× |
| 70° | 1033 | 68% | 1.94 | 2.9× |
| 90° | 721 | 47% | 1.19 | 3.1× |
A fixed array in Chok Chai produces the most over a year at 16°. The design month for an off-grid system is August: at 10° it makes 3.79 kWh per kWp a day, 2% more than at 16°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Chok Chai at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 16° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 16° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.94 | 5.30 | 4.36 | 4.57 | 24.2 °C |
| February | 5.26 | 4.56 | 3.71 | 4.55 | 27.1 °C |
| March | 5.40 | 3.66 | 2.94 | 4.38 | 29.1 °C |
| April | 5.77 | 2.86 | 2.27 | 4.43 | 29.8 °C |
| May | 5.56 | 2.20 | 1.74 | 4.13 | 28.3 °C |
| June | 5.34 | 2.00 | 1.58 | 3.92 | 27.1 °C |
| July | 5.11 | 2.09 | 1.66 | 3.80 | 26.4 °C |
| August | 4.85 | 2.42 | 1.94 | 3.72 | 26.2 °C |
| September | 4.70 | 2.91 | 2.35 | 3.75 | 25.8 °C |
| October | 4.74 | 3.67 | 3.00 | 3.99 | 25.3 °C |
| November | 4.83 | 4.77 | 3.93 | 4.36 | 24.1 °C |
| December | 4.81 | 5.45 | 4.51 | 4.54 | 23.0 °C |
| Year | 5.11 avg | 3.48 avg | 1033 kWh | 1524 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 750 Wp of panels at 70°, versus 320 Wp at 16°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Chok Chai
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.
2.3 mrow pitch at 70°
2.4 mrow pitch at 16°
How Chok Chai compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
138thof 295 places in Thailand for sunshine, shared: 5.11 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in Thailand: 1,524 against 1,509 kWh per kWp.
+4 mindaylight on the longest day, compared with Bangkok: 13 h 00 min against 12 h 56 min.
16°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); Chok Chai ranks joint 138th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.58 kWh a day here, against 1.53 kWh on average in Thailand. The shortest day lasts 11 h 15 min, −4 min compared with Bangkok.
Solar forecast for Chok Chai, 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 Chok Chai
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Places near Chok Chai
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A free, live card for Chok Chai: 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.