Catamarca · Argentina · 28.46° S · 65.72° W
Solar position in San Isidro
Sun position, daylight and the best solar panel angle for San Isidro — computed for 28.46° S, 65.72° W, 518 m above sea level.
The sun right now
Sun in San Isidro today
Saturday, 24 October 2026 · local time UTC−3
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:14 | sun 18° below horizon |
| Nautical dawn | 05:43 | 12° below |
| Civil dawn | 06:12 | 6° below |
| Sunrise | 06:37 | 104° ESE |
| Golden hour ends | 07:08 | sun 6° up |
| Solar noon | 13:07 | 73.5° high |
| Golden hour starts | 19:05 | sun 6° up |
| Sunset | 19:37 | 256° WSW |
| Civil dusk | 20:01 | 6° below |
| Nautical dusk | 20:30 | 12° below |
| Astronomical dusk | 21:00 | 18° below |
| Day length | 13 h 00 min | |
Sun path diagram for San Isidro
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 38.1° at solar noon in San Isidro; on the December solstice only 85.0°. 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 | 06:44 | 13:34 | 20:23 | 13 h 38 min | 81.3° |
| February | 07:09 | 13:36 | 20:02 | 12 h 53 min | 71.9° |
| March | 07:26 | 13:29 | 19:32 | 12 h 06 min | 61.1° |
| April | 07:44 | 13:21 | 18:58 | 11 h 15 min | 49.5° |
| May | 08:01 | 13:19 | 18:37 | 10 h 36 min | 41.3° |
| June | 08:14 | 13:24 | 18:34 | 10 h 20 min | 38.1° |
| July | 08:11 | 13:29 | 18:47 | 10 h 35 min | 41.2° |
| August | 07:48 | 13:26 | 19:03 | 11 h 15 min | 49.6° |
| September | 07:13 | 13:16 | 19:18 | 12 h 05 min | 61.0° |
| October | 06:40 | 13:07 | 19:35 | 12 h 55 min | 72.4° |
| November | 06:19 | 13:08 | 19:58 | 13 h 39 min | 81.6° |
| December | 06:22 | 13:21 | 20:19 | 13 h 58 min | 85.0° |
A year of daylight in San Isidro
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 San Isidro
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
28°collects the most energy over a year: 1755 kWh per kWp.
41°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 | May kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1576 | 90% | 2.83 | 2.1× |
| 15° | 1717 | 98% | 3.56 | 1.6× |
| 28° year-round best = latitude | 1755 | 100% | 4.02 | 1.4× |
| 30° | 1753 | 100% | 4.07 | 1.3× |
| 41° off-grid best | 1713 | 98% | 4.28 | 1.3× |
| 45° | 1684 | 96% | 4.32 | 1.4× |
| 60° | 1516 | 86% | 4.30 | 1.8× |
| 70° | 1354 | 77% | 4.13 | 2.2× |
| 90° | 954 | 54% | 3.46 | 4.1× |
A fixed array in San Isidro produces the most over a year at 28°. The design month for an off-grid system is May: at 41° it makes 4.28 kWh per kWp a day, 7% more than at 28°, and costs 2% of the yearly total. Why steep panels win winter.
Off-grid solar in San Isidro at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 28° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 28° | Mean temp. |
|---|---|---|---|---|---|
| January | 6.94 | 3.05 | 2.47 | 4.97 | 25.4 °C |
| February | 6.19 | 3.64 | 2.98 | 4.87 | 24.3 °C |
| March | 5.30 | 4.25 | 3.52 | 4.68 | 22.2 °C |
| April | 4.26 | 4.67 | 3.93 | 4.33 | 18.8 °C |
| May | 3.48 | 4.83 | 4.13 | 4.02 | 14.6 °C |
| June | 3.27 | 5.18 | 4.48 | 4.08 | 12.1 °C |
| July | 3.67 | 5.65 | 4.89 | 4.54 | 11.5 °C |
| August | 4.68 | 5.93 | 5.08 | 5.20 | 14.0 °C |
| September | 5.72 | 5.32 | 4.50 | 5.48 | 17.2 °C |
| October | 6.45 | 4.22 | 3.50 | 5.35 | 21.3 °C |
| November | 7.05 | 3.28 | 2.68 | 5.19 | 23.8 °C |
| December | 7.13 | 2.85 | 2.30 | 4.98 | 25.0 °C |
| Year | 5.34 avg | 4.41 avg | 1354 kWh | 1755 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 290 Wp at 28°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in San Isidro
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°
3.1 mrow pitch at 28°
How San Isidro compares in Argentina
Against the other 313 places in Argentina with climate data, for a fixed array at its best angle.
31stof 314 places in Argentina for sunshine: 5.34 peak sun hours a day on flat ground.
+7%solar energy a year compared with the average place in Argentina: 1,755 against 1,639 kWh per kWp.
−31 mindaylight on the longest day, compared with Buenos Aires: 13 h 57 min against 14 h 29 min.
28°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); San Isidro ranks 31st. 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 20 min, +30 min compared with Buenos Aires.
Solar forecast for San Isidro, 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 San Isidro
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Places near San Isidro
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A free, live card for San Isidro: 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.