Buenos Aires · Argentina · 34.65° S · 58.64° W
Solar position in Castelar
Sun position, daylight and the best solar panel angle for Castelar — computed for 34.65° S, 58.64° W, 25 m above sea level.
The sun right now
Sun in Castelar today
Saturday, 24 October 2026 · local time UTC−3
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:31 | sun 18° below horizon |
| Nautical dawn | 05:03 | 12° below |
| Civil dawn | 05:35 | 6° below |
| Sunrise | 06:01 | 105° ESE |
| Golden hour ends | 06:35 | sun 6° up |
| Solar noon | 12:38 | 67.3° high |
| Golden hour starts | 18:42 | sun 6° up |
| Sunset | 19:16 | 255° WSW |
| Civil dusk | 19:43 | 6° below |
| Nautical dusk | 20:14 | 12° below |
| Astronomical dusk | 20:47 | 18° below |
| Day length | 13 h 15 min | |
Sun path diagram for Castelar
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 31.9° at solar noon in Castelar; on the December solstice only 78.8°. Sunrise swings from 62° ENE in June to 120° ESE in December — a 58° 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 | 06:03 | 13:05 | 20:07 | 14 h 04 min | 75.1° |
| February | 06:34 | 13:07 | 19:41 | 13 h 06 min | 65.7° |
| March | 06:58 | 13:01 | 19:04 | 12 h 06 min | 54.9° |
| April | 07:22 | 12:53 | 18:23 | 11 h 01 min | 43.3° |
| May | 07:45 | 12:51 | 17:56 | 10 h 11 min | 35.1° |
| June | 08:01 | 12:56 | 17:51 | 9 h 50 min | 31.9° |
| July | 07:56 | 13:01 | 18:06 | 10 h 10 min | 35.0° |
| August | 07:27 | 12:57 | 18:28 | 11 h 01 min | 43.4° |
| September | 06:45 | 12:47 | 18:50 | 12 h 05 min | 54.8° |
| October | 06:04 | 12:39 | 19:14 | 13 h 09 min | 66.2° |
| November | 05:37 | 12:40 | 19:43 | 14 h 06 min | 75.4° |
| December | 05:38 | 12:52 | 20:07 | 14 h 29 min | 78.8° |
A year of daylight in Castelar
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 Castelar
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
30°collects the most energy over a year: 1603 kWh per kWp.
58°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 | 88% | 1.81 | 3.3× |
| 15° | 1556 | 97% | 2.46 | 2.4× |
| 30° year-round best | 1603 | 100% | 2.96 | 1.8× |
| 35° = latitude | 1597 | 100% | 3.09 | 1.7× |
| 45° | 1554 | 97% | 3.27 | 1.5× |
| 58° off-grid best | 1440 | 90% | 3.38 | 1.3× |
| 60° | 1416 | 88% | 3.38 | 1.3× |
| 70° | 1279 | 80% | 3.33 | 1.4× |
| 90° | 924 | 58% | 2.96 | 2.2× |
A fixed array in Castelar produces the most over a year at 30°. The design month for an off-grid system is June: at 58° it makes 3.38 kWh per kWp a day, 14% more than at 30°, and costs 10% of the yearly total. Why steep panels win winter.
Off-grid solar in Castelar at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 30° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 30° | Mean temp. |
|---|---|---|---|---|---|
| January | 7.22 | 3.76 | 3.06 | 5.36 | 24.7 °C |
| February | 6.34 | 4.29 | 3.53 | 5.20 | 23.6 °C |
| March | 5.23 | 4.76 | 3.96 | 4.87 | 21.2 °C |
| April | 3.86 | 4.77 | 4.03 | 4.19 | 17.4 °C |
| May | 2.73 | 4.12 | 3.53 | 3.32 | 13.7 °C |
| June | 2.26 | 3.83 | 3.33 | 2.96 | 10.6 °C |
| July | 2.39 | 3.79 | 3.30 | 3.03 | 9.7 °C |
| August | 3.26 | 4.33 | 3.75 | 3.74 | 11.5 °C |
| September | 4.45 | 4.51 | 3.87 | 4.46 | 13.6 °C |
| October | 5.56 | 4.20 | 3.55 | 4.87 | 16.7 °C |
| November | 6.81 | 3.83 | 3.19 | 5.30 | 20.1 °C |
| December | 7.50 | 3.60 | 2.95 | 5.46 | 23.0 °C |
| Year | 4.79 avg | 4.15 avg | 1279 kWh | 1603 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 400 Wp of panels at 70°, versus 400 Wp at 30°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Castelar
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.
4.1 mrow pitch at 70°
3.6 mrow pitch at 30°
How Castelar compares in Argentina
Against the other 313 places in Argentina with climate data, for a fixed array at its best angle.
227thof 314 places in Argentina for sunshine, shared: 4.79 peak sun hours a day on flat ground.
−2%solar energy a year compared with the average place in Argentina: 1,603 against 1,639 kWh per kWp.
±0 mindaylight on the longest day, compared with Buenos Aires: 14 h 29 min against 14 h 29 min.
30°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); Castelar ranks joint 227th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 2.95 kWh a day here, against 2.68 kWh on average in Argentina. The shortest day lasts 9 h 50 min, ±0 min compared with Buenos Aires.
Solar forecast for Castelar, 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 Castelar
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Places near Castelar
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A free, live card for Castelar: 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.