Granma Province · Cuba · 20.56° N · 76.92° W
Solar position in Río Cauto
Sun position, daylight and the best solar panel angle for Río Cauto — computed for 20.56° N, 76.92° W, 12 m above sea level.
The sun right now
Sun in Río Cauto today
Saturday, 24 October 2026 · local time UTC−4
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:51 | sun 18° below horizon |
| Nautical dawn | 06:17 | 12° below |
| Civil dawn | 06:43 | 6° below |
| Sunrise | 07:06 | 102° ESE |
| Golden hour ends | 07:36 | sun 6° up |
| Solar noon | 12:51 | 57.5° high |
| Golden hour starts | 18:07 | sun 6° up |
| Sunset | 18:37 | 257° WSW |
| Civil dusk | 18:59 | 6° below |
| Nautical dusk | 19:25 | 12° below |
| Astronomical dusk | 19:51 | 18° below |
| Day length | 11 h 31 min | |
Sun path diagram for Río Cauto
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 87.1° at solar noon in Río Cauto; on the December solstice only 46.0°. Sunrise swings from 65° ENE in June to 115° ESE in December — a 50° 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 | 06:46 | 12:19 | 17:51 | 11 h 06 min | 49.7° |
| February | 06:33 | 12:21 | 18:09 | 11 h 36 min | 59.1° |
| March | 07:10 | 13:14 | 19:19 | 12 h 08 min | 69.9° |
| April | 06:44 | 13:06 | 19:28 | 12 h 44 min | 81.5° |
| May | 06:28 | 13:04 | 19:40 | 13 h 11 min | 89.7° |
| June | 06:28 | 13:09 | 19:50 | 13 h 23 min | 87.1° |
| July | 06:38 | 13:14 | 19:49 | 13 h 12 min | 89.8° |
| August | 06:48 | 13:10 | 19:32 | 12 h 44 min | 81.4° |
| September | 06:56 | 13:00 | 19:04 | 12 h 08 min | 69.9° |
| October | 07:05 | 12:52 | 18:39 | 11 h 34 min | 58.6° |
| November | 06:21 | 11:53 | 17:25 | 11 h 05 min | 49.4° |
| December | 06:39 | 12:05 | 17:32 | 10 h 53 min | 46.0° |
A year of daylight in Río Cauto
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 Río Cauto
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
20°collects the most energy over a year: 1669 kWh per kWp.
24°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 | November kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1585 | 95% | 3.44 | 1.6× |
| 15° | 1664 | 100% | 4.05 | 1.3× |
| 20° year-round best | 1669 | 100% | 4.20 | 1.2× |
| 21° = latitude | 1669 | 100% | 4.23 | 1.2× |
| 24° off-grid best | 1665 | 100% | 4.30 | 1.2× |
| 30° | 1646 | 99% | 4.42 | 1.2× |
| 45° | 1533 | 92% | 4.52 | 1.5× |
| 60° | 1333 | 80% | 4.34 | 1.9× |
| 70° | 1161 | 70% | 4.08 | 2.5× |
| 90° | 788 | 47% | 3.23 | 3.6× |
A fixed array in Río Cauto produces the most over a year at 20°. The design month for an off-grid system is November: at 24° it makes 4.30 kWh per kWp a day, 2% more than at 20°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Río Cauto at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 20° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 20° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.32 | 5.31 | 4.36 | 4.29 | 24.7 °C |
| February | 5.18 | 5.22 | 4.28 | 4.82 | 25.3 °C |
| March | 5.88 | 4.46 | 3.64 | 5.02 | 25.9 °C |
| April | 6.35 | 3.37 | 2.72 | 4.97 | 27.1 °C |
| May | 6.17 | 2.50 | 2.00 | 4.55 | 27.6 °C |
| June | 6.20 | 2.27 | 1.79 | 4.45 | 28.3 °C |
| July | 6.45 | 2.40 | 1.90 | 4.65 | 28.8 °C |
| August | 6.27 | 2.99 | 2.39 | 4.75 | 29.0 °C |
| September | 5.74 | 3.82 | 3.08 | 4.67 | 28.7 °C |
| October | 4.90 | 4.35 | 3.53 | 4.32 | 27.6 °C |
| November | 4.37 | 4.99 | 4.08 | 4.20 | 26.1 °C |
| December | 4.14 | 5.43 | 4.45 | 4.20 | 25.3 °C |
| Year | 5.50 avg | 3.92 avg | 1161 kWh | 1669 kWh |
Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 660 Wp of panels at 70°, versus 280 Wp at 20°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Río Cauto
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.
2.7 mrow pitch at 70°
2.6 mrow pitch at 20°
How Río Cauto compares in Cuba
Against the other 122 places in Cuba with climate data, for a fixed array at its best angle.
13thof 123 places in Cuba for sunshine, shared: 5.50 peak sun hours a day on flat ground.
+2%solar energy a year compared with the average place in Cuba: 1,669 against 1,639 kWh per kWp.
−11 mindaylight on the longest day, compared with Havana: 13 h 23 min against 13 h 34 min.
20°best year-round tilt here; across Cuba it runs from 19° in Puerto Padre to 22° in Consolación del Sur.
Of the 123 places in Cuba, Niquero gets the most sun (5.68 peak sun hours a day) and Remedios and one other place the least (5.17); Río Cauto ranks joint 13th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.79 kWh a day here, against 1.85 kWh on average in Cuba. The shortest day lasts 10 h 53 min, +10 min compared with Havana.
Solar forecast for Río Cauto, 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 Río Cauto
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A free, live card for Río Cauto: 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.