Phichit · Thailand · 16.16° N · 100.60° E
Solar position in Thap Khlo
Sun position, daylight and the best solar panel angle for Thap Khlo — computed for 16.16° N, 100.60° E, 51 m above sea level.
The sun right now
Sun in Thap Khlo today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:59 | sun 18° below horizon |
| Nautical dawn | 05:25 | 12° below |
| Civil dawn | 05:50 | 6° below |
| Sunrise | 06:12 | 102° ESE |
| Golden hour ends | 06:41 | sun 6° up |
| Solar noon | 12:01 | 61.7° high |
| Golden hour starts | 17:21 | sun 6° up |
| Sunset | 17:50 | 258° WSW |
| Civil dusk | 18:12 | 6° below |
| Nautical dusk | 18:38 | 12° below |
| Astronomical dusk | 19:03 | 18° below |
| Day length | 11 h 39 min | |
Sun path diagram for Thap Khlo
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 82.7° at solar noon in Thap Khlo; 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 | 06:49 | 12:28 | 18:08 | 11 h 19 min | 54.0° |
| February | 06:40 | 12:31 | 18:22 | 11 h 42 min | 63.3° |
| March | 06:21 | 12:24 | 18:28 | 12 h 07 min | 74.1° |
| April | 05:59 | 12:16 | 18:33 | 12 h 35 min | 85.7° |
| May | 05:46 | 12:14 | 18:42 | 12 h 56 min | 86.0° |
| June | 05:46 | 12:19 | 18:52 | 13 h 05 min | 82.7° |
| July | 05:55 | 12:24 | 18:52 | 12 h 57 min | 85.7° |
| August | 06:03 | 12:20 | 18:38 | 12 h 35 min | 85.9° |
| September | 06:06 | 12:10 | 18:14 | 12 h 08 min | 74.5° |
| October | 06:11 | 12:02 | 17:53 | 11 h 42 min | 63.1° |
| November | 06:23 | 12:03 | 17:42 | 11 h 19 min | 53.9° |
| December | 06:40 | 12:15 | 17:50 | 11 h 10 min | 50.4° |
A year of daylight in Thap Khlo
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 Thap Khlo
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: 1535 kWh per kWp.
8°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° | 1478 | 96% | 3.81 | 1.3× |
| 8° off-grid best | 1518 | 99% | 3.79 | 1.2× |
| 15° | 1534 | 100% | 3.72 | 1.2× |
| 16° = latitude | 1535 | 100% | 3.70 | 1.2× |
| 18° year-round best | 1535 | 100% | 3.68 | 1.2× |
| 30° | 1506 | 98% | 3.44 | 1.4× |
| 45° | 1397 | 91% | 3.00 | 1.7× |
| 60° | 1215 | 79% | 2.42 | 2.2× |
| 70° | 1061 | 69% | 1.98 | 2.7× |
| 90° | 742 | 48% | 1.19 | 3.1× |
A fixed array in Thap Khlo produces the most over a year at 18°. The design month for an off-grid system is August: at 8° it makes 3.79 kWh per kWp a day, 3% more than at 18°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Thap Khlo 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 | 4.29 | 4.49 | 25.0 °C |
| February | 5.25 | 4.66 | 3.78 | 4.57 | 28.1 °C |
| March | 5.47 | 3.81 | 3.05 | 4.44 | 30.4 °C |
| April | 6.03 | 3.06 | 2.42 | 4.58 | 31.8 °C |
| May | 5.71 | 2.33 | 1.84 | 4.19 | 29.8 °C |
| June | 5.42 | 2.12 | 1.67 | 3.93 | 28.2 °C |
| July | 5.11 | 2.20 | 1.74 | 3.77 | 27.4 °C |
| August | 4.83 | 2.48 | 1.98 | 3.68 | 27.0 °C |
| September | 4.73 | 2.99 | 2.42 | 3.77 | 26.7 °C |
| October | 4.80 | 3.82 | 3.11 | 4.08 | 26.2 °C |
| November | 4.89 | 5.01 | 4.11 | 4.49 | 25.1 °C |
| December | 4.71 | 5.47 | 4.51 | 4.52 | 23.8 °C |
| Year | 5.14 avg | 3.59 avg | 1061 kWh | 1535 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 320 Wp at 18°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Thap Khlo
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 Thap Khlo compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
112thof 295 places in Thailand for sunshine, shared: 5.14 peak sun hours a day on flat ground.
+2%solar energy a year compared with the average place in Thailand: 1,535 against 1,509 kWh per kWp.
+9 mindaylight on the longest day, compared with Bangkok: 13 h 05 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); Thap Khlo ranks joint 112th. 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 Thap Khlo, 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 Thap Khlo
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Places near Thap Khlo
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A free, live card for Thap Khlo: 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.