Goiás · Brazil · 16.83° S · 49.53° W
Solar position in Guapó
Sun position, daylight and the best solar panel angle for Guapó — computed for 16.83° S, 49.53° W, 710 m above sea level.
The sun right now
Sun in Guapó today
Saturday, 24 October 2026 · local time UTC−3
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:29 | sun 18° below horizon |
| Nautical dawn | 04:56 | 12° below |
| Civil dawn | 05:22 | 6° below |
| Sunrise | 05:44 | 103° ESE |
| Golden hour ends | 06:13 | sun 6° up |
| Solar noon | 12:02 | 85.1° high |
| Golden hour starts | 17:51 | sun 6° up |
| Sunset | 18:20 | 257° WSW |
| Civil dusk | 18:42 | 6° below |
| Nautical dusk | 19:08 | 12° below |
| Astronomical dusk | 19:35 | 18° below |
| Day length | 12 h 36 min | |
Sun path diagram for Guapó
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 49.7° at solar noon in Guapó; on the December solstice only 83.4°. Sunrise swings from 66° ENE in June to 115° 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 | 06:00 | 12:29 | 18:58 | 12 h 58 min | 87.0° |
| February | 06:15 | 12:31 | 18:47 | 12 h 32 min | 83.6° |
| March | 06:22 | 12:25 | 18:28 | 12 h 06 min | 72.8° |
| April | 06:27 | 12:16 | 18:05 | 11 h 38 min | 61.2° |
| May | 06:36 | 12:14 | 17:52 | 11 h 16 min | 52.9° |
| June | 06:46 | 12:19 | 17:53 | 11 h 07 min | 49.7° |
| July | 06:46 | 12:24 | 18:02 | 11 h 16 min | 52.8° |
| August | 06:32 | 12:21 | 18:10 | 11 h 38 min | 61.2° |
| September | 06:08 | 12:11 | 18:14 | 12 h 05 min | 72.6° |
| October | 05:46 | 12:02 | 18:19 | 12 h 34 min | 84.0° |
| November | 05:35 | 12:04 | 18:33 | 12 h 58 min | 86.8° |
| December | 05:42 | 12:16 | 18:50 | 13 h 08 min | 83.4° |
A year of daylight in Guapó
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 Guapó
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
21°collects the most energy over a year: 1699 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 | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1607 | 95% | 4.56 | 1.2× |
| 10° off-grid best | 1675 | 99% | 4.38 | 1.1× |
| 15° | 1693 | 100% | 4.25 | 1.2× |
| 17° = latitude | 1697 | 100% | 4.19 | 1.2× |
| 21° year-round best | 1699 | 100% | 4.06 | 1.3× |
| 30° | 1680 | 99% | 3.71 | 1.5× |
| 45° | 1569 | 92% | 2.98 | 1.9× |
| 60° | 1370 | 81% | 2.15 | 2.5× |
| 70° | 1198 | 70% | 1.60 | 3.2× |
| 90° | 828 | 49% | 1.12 | 3.6× |
A fixed array in Guapó produces the most over a year at 21°. The design month for an off-grid system is December: at 10° it makes 4.38 kWh per kWp a day, 8% more than at 21°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Guapó at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 21° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 21° | Mean temp. |
|---|---|---|---|---|---|
| January | 5.76 | 2.15 | 1.73 | 4.18 | 24.0 °C |
| February | 5.85 | 2.75 | 2.24 | 4.46 | 23.9 °C |
| March | 5.57 | 3.53 | 2.90 | 4.55 | 23.8 °C |
| April | 5.41 | 4.68 | 3.87 | 4.85 | 23.1 °C |
| May | 4.94 | 5.47 | 4.55 | 4.84 | 21.3 °C |
| June | 4.73 | 5.95 | 4.96 | 4.87 | 21.1 °C |
| July | 5.02 | 6.10 | 5.07 | 5.09 | 21.9 °C |
| August | 5.68 | 5.64 | 4.64 | 5.32 | 24.4 °C |
| September | 5.92 | 4.25 | 3.46 | 4.97 | 27.1 °C |
| October | 5.86 | 3.04 | 2.45 | 4.53 | 26.9 °C |
| November | 5.66 | 2.30 | 1.85 | 4.15 | 24.9 °C |
| December | 5.69 | 1.99 | 1.60 | 4.06 | 24.3 °C |
| Year | 5.51 avg | 3.99 avg | 1198 kWh | 1699 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 740 Wp of panels at 70°, versus 290 Wp at 21°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Guapó
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 21°
How Guapó compares in Brazil
Against the other 2,263 places in Brazil with climate data, for a fixed array at its best angle.
668thof 2,264 places in Brazil for sunshine, shared: 5.51 peak sun hours a day on flat ground.
+8%solar energy a year compared with the average place in Brazil: 1,699 against 1,581 kWh per kWp.
−27 mindaylight on the longest day, compared with São Paulo: 13 h 08 min against 13 h 35 min.
21°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); Guapó ranks joint 668th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.60 kWh a day here, against 1.56 kWh on average in Brazil. The shortest day lasts 11 h 07 min, +26 min compared with São Paulo.
Solar forecast for Guapó, 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 Guapó
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A free, live card for Guapó: 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.