Tocantins · Brazil · 10.71° S · 48.42° W
Solar position in Porto Nacional
Sun position, daylight and the best solar panel angle for Porto Nacional — computed for 10.71° S, 48.42° W, 231 m above sea level.
The sun right now
Sun in Porto Nacional today
Saturday, 24 October 2026 · local time UTC−3
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:33 | sun 18° below horizon |
| Nautical dawn | 04:58 | 12° below |
| Civil dawn | 05:23 | 6° below |
| Sunrise | 05:45 | 102° ESE |
| Golden hour ends | 06:13 | sun 6° up |
| Solar noon | 11:57 | 88.8° high |
| Golden hour starts | 17:42 | sun 6° up |
| Sunset | 18:10 | 258° WSW |
| Civil dusk | 18:32 | 6° below |
| Nautical dusk | 18:57 | 12° below |
| Astronomical dusk | 19:22 | 18° below |
| Day length | 12 h 25 min | |
Sun path diagram for Porto Nacional
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 55.9° at solar noon in Porto Nacional; on the December solstice only 77.3°. 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 | 06:05 | 12:25 | 18:44 | 12 h 39 min | 80.9° |
| February | 06:15 | 12:27 | 18:38 | 12 h 23 min | 89.7° |
| March | 06:17 | 12:20 | 18:23 | 12 h 06 min | 78.9° |
| April | 06:18 | 12:12 | 18:06 | 11 h 48 min | 67.3° |
| May | 06:22 | 12:10 | 17:57 | 11 h 35 min | 59.0° |
| June | 06:30 | 12:15 | 18:00 | 11 h 30 min | 55.9° |
| July | 06:32 | 12:20 | 18:07 | 11 h 35 min | 58.9° |
| August | 06:22 | 12:16 | 18:11 | 11 h 48 min | 67.3° |
| September | 06:03 | 12:06 | 18:09 | 12 h 06 min | 78.8° |
| October | 05:46 | 11:58 | 18:10 | 12 h 23 min | 89.9° |
| November | 05:40 | 11:59 | 18:19 | 12 h 39 min | 80.7° |
| December | 05:49 | 12:11 | 18:34 | 12 h 45 min | 77.3° |
A year of daylight in Porto Nacional
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 Porto Nacional
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
15°collects the most energy over a year: 1646 kWh per kWp.
7°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 | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1596 | 97% | 4.28 | 1.2× |
| 7° off-grid best | 1631 | 99% | 4.13 | 1.3× |
| 11° = latitude | 1642 | 100% | 4.02 | 1.3× |
| 15° year-round best | 1646 | 100% | 3.90 | 1.4× |
| 30° | 1601 | 97% | 3.32 | 1.7× |
| 45° | 1465 | 89% | 2.57 | 2.3× |
| 60° | 1249 | 76% | 1.75 | 3.1× |
| 70° | 1072 | 65% | 1.27 | 4.0× |
| 90° | 732 | 44% | 1.05 | 3.9× |
A fixed array in Porto Nacional produces the most over a year at 15°. The design month for an off-grid system is December: at 7° it makes 4.13 kWh per kWp a day, 6% more than at 15°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Porto Nacional at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 15° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 15° | Mean temp. |
|---|---|---|---|---|---|
| January | 5.35 | 1.74 | 1.37 | 3.93 | 25.8 °C |
| February | 5.29 | 2.22 | 1.78 | 4.04 | 25.6 °C |
| March | 5.12 | 2.92 | 2.37 | 4.08 | 25.6 °C |
| April | 5.25 | 3.97 | 3.24 | 4.43 | 25.6 °C |
| May | 5.22 | 5.01 | 4.11 | 4.66 | 25.4 °C |
| June | 5.43 | 6.07 | 4.99 | 5.07 | 24.7 °C |
| July | 5.76 | 6.21 | 5.09 | 5.32 | 25.3 °C |
| August | 6.22 | 5.41 | 4.39 | 5.41 | 27.5 °C |
| September | 6.15 | 3.85 | 3.09 | 4.96 | 29.7 °C |
| October | 5.63 | 2.55 | 2.02 | 4.30 | 29.2 °C |
| November | 5.38 | 1.83 | 1.44 | 3.97 | 27.3 °C |
| December | 5.38 | 1.61 | 1.27 | 3.90 | 26.4 °C |
| Year | 5.52 avg | 3.62 avg | 1072 kWh | 1646 kWh |
Sizing example. To run a 1 kWh-per-day load through December on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 930 Wp of panels at 70°, versus 300 Wp at 15°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Porto Nacional
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°
2.3 mrow pitch at 15°
How Porto Nacional compares in Brazil
Against the other 2,263 places in Brazil with climate data, for a fixed array at its best angle.
616thof 2,264 places in Brazil for sunshine, shared: 5.52 peak sun hours a day on flat ground.
+4%solar energy a year compared with the average place in Brazil: 1,646 against 1,581 kWh per kWp.
−50 mindaylight on the longest day, compared with São Paulo: 12 h 45 min against 13 h 35 min.
15°best year-round tilt here; across Brazil it runs from 0° in Macapá to 28° in Santa Vitória do Palmar.
Of the 2,264 places in Brazil, Catolé do Rocha gets the most sun (6.16 peak sun hours a day) and Paranaguá the least (4.01); Porto Nacional ranks joint 616th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.26 kWh a day here, against 1.56 kWh on average in Brazil. The shortest day lasts 11 h 30 min, +49 min compared with São Paulo.
Solar forecast for Porto Nacional, 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 Porto Nacional
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A free, live card for Porto Nacional: 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.