Corrientes · Argentina · 28.55° S · 56.04° W
Solar position in Santo Tomé
Sun position, daylight and the best solar panel angle for Santo Tomé — computed for 28.55° S, 56.04° W, 67 m above sea level.
The sun right now
Sun in Santo Tomé today
Saturday, 24 October 2026 · local time UTC−3
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:35 | sun 18° below horizon |
| Nautical dawn | 05:05 | 12° below |
| Civil dawn | 05:33 | 6° below |
| Sunrise | 05:58 | 104° ESE |
| Golden hour ends | 06:30 | sun 6° up |
| Solar noon | 12:28 | 73.4° high |
| Golden hour starts | 18:26 | sun 6° up |
| Sunset | 18:58 | 256° WSW |
| Civil dusk | 19:23 | 6° below |
| Nautical dusk | 19:52 | 12° below |
| Astronomical dusk | 20:21 | 18° below |
| Day length | 13 h 00 min | |
Sun path diagram for Santo Tomé
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 38.0° at solar noon in Santo Tomé; on the December solstice only 84.9°. Sunrise swings from 64° ENE in June to 117° ESE in December — a 54° 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 | 12:55 | 19:44 | 13 h 39 min | 81.2° |
| February | 06:30 | 12:57 | 19:24 | 12 h 53 min | 71.8° |
| March | 06:48 | 12:51 | 18:53 | 12 h 06 min | 61.0° |
| April | 07:05 | 12:42 | 18:19 | 11 h 15 min | 49.4° |
| May | 07:22 | 12:40 | 17:58 | 10 h 35 min | 41.2° |
| June | 07:36 | 12:46 | 17:55 | 10 h 19 min | 38.0° |
| July | 07:33 | 12:50 | 18:08 | 10 h 35 min | 41.1° |
| August | 07:10 | 12:47 | 18:24 | 11 h 15 min | 49.5° |
| September | 06:34 | 12:37 | 18:39 | 12 h 05 min | 60.9° |
| October | 06:01 | 12:28 | 18:56 | 12 h 56 min | 72.3° |
| November | 05:40 | 12:30 | 19:20 | 13 h 40 min | 81.5° |
| December | 05:43 | 12:42 | 19:41 | 13 h 58 min | 84.9° |
A year of daylight in Santo Tomé
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 Santo Tomé
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
25°collects the most energy over a year: 1543 kWh per kWp.
54°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 | June kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1417 | 92% | 2.10 | 2.6× |
| 15° | 1522 | 99% | 2.67 | 2.0× |
| 25° year-round best | 1543 | 100% | 2.96 | 1.7× |
| 29° = latitude | 1539 | 100% | 3.06 | 1.6× |
| 30° | 1537 | 100% | 3.08 | 1.6× |
| 45° | 1463 | 95% | 3.30 | 1.4× |
| 54° off-grid best | 1377 | 89% | 3.34 | 1.3× |
| 60° | 1304 | 85% | 3.32 | 1.4× |
| 70° | 1158 | 75% | 3.22 | 1.7× |
| 90° | 804 | 52% | 2.76 | 2.8× |
A fixed array in Santo Tomé produces the most over a year at 25°. The design month for an off-grid system is June: at 54° it makes 3.34 kWh per kWp a day, 13% more than at 25°, and costs 11% of the yearly total. Why steep panels win winter.
Off-grid solar in Santo Tomé at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 25° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 25° | Mean temp. |
|---|---|---|---|---|---|
| January | 6.75 | 3.07 | 2.47 | 4.95 | 26.8 °C |
| February | 6.23 | 3.70 | 3.01 | 4.93 | 26.3 °C |
| March | 5.37 | 4.32 | 3.55 | 4.71 | 24.4 °C |
| April | 4.19 | 4.57 | 3.81 | 4.16 | 21.0 °C |
| May | 3.11 | 4.15 | 3.52 | 3.40 | 16.6 °C |
| June | 2.61 | 3.77 | 3.22 | 2.96 | 14.6 °C |
| July | 2.94 | 4.19 | 3.60 | 3.35 | 13.7 °C |
| August | 3.65 | 4.35 | 3.71 | 3.83 | 15.5 °C |
| September | 4.37 | 3.95 | 3.33 | 4.08 | 17.7 °C |
| October | 5.31 | 3.55 | 2.95 | 4.43 | 20.9 °C |
| November | 6.55 | 3.15 | 2.58 | 4.97 | 22.9 °C |
| December | 6.93 | 2.86 | 2.30 | 4.98 | 25.5 °C |
| Year | 4.83 avg | 3.80 avg | 1158 kWh | 1543 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 510 Wp of panels at 70°, versus 400 Wp at 25°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Santo Tomé
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.
3.4 mrow pitch at 70°
3.0 mrow pitch at 25°
How Santo Tomé compares in Argentina
Against the other 313 places in Argentina with climate data, for a fixed array at its best angle.
191stof 314 places in Argentina for sunshine, shared: 4.83 peak sun hours a day on flat ground.
−6%solar energy a year compared with the average place in Argentina: 1,542 against 1,639 kWh per kWp.
−31 mindaylight on the longest day, compared with Buenos Aires: 13 h 58 min against 14 h 29 min.
25°best year-round tilt here; across Argentina it runs from 21° in Tartagal to 44° in Río Gallegos.
Of the 314 places in Argentina, Belén gets the most sun (6.11 peak sun hours a day) and Ushuaia the least (2.59); Santo Tomé ranks joint 191st. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 2.30 kWh a day here, against 2.68 kWh on average in Argentina. The shortest day lasts 10 h 19 min, +29 min compared with Buenos Aires.
Solar forecast for Santo Tomé, 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 Santo Tomé
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A free, live card for Santo Tomé: 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.