Republic of the Congo · 4.27° S · 15.28° E
Solar position in Brazzaville
Sun position, daylight and the best solar panel angle for Brazzaville — computed for 4.27° S, 15.28° E, 284 m above sea level.
The sun right now
Sun in Brazzaville today
Saturday, 24 October 2026 · local time UTC+1
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:25 | sun 18° below horizon |
| Nautical dawn | 04:50 | 12° below |
| Civil dawn | 05:14 | 6° below |
| Sunrise | 05:36 | 102° ESE |
| Golden hour ends | 06:04 | sun 6° up |
| Solar noon | 11:43 | 82.4° high |
| Golden hour starts | 17:22 | sun 6° up |
| Sunset | 17:50 | 258° WSW |
| Civil dusk | 18:11 | 6° below |
| Nautical dusk | 18:35 | 12° below |
| Astronomical dusk | 19:00 | 18° below |
| Day length | 12 h 14 min | |
Sun path diagram for Brazzaville
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 62.3° at solar noon in Brazzaville; on the December solstice only 70.8°. Sunrise swings from 67° ENE in June to 114° ESE in December — a 47° 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 | 12:10 | 18:19 | 12 h 20 min | 74.4° |
| February | 06:05 | 12:12 | 18:18 | 12 h 13 min | 83.8° |
| March | 06:02 | 12:05 | 18:09 | 12 h 06 min | 85.4° |
| April | 05:57 | 11:57 | 17:57 | 11 h 59 min | 73.8° |
| May | 05:58 | 11:55 | 17:52 | 11 h 55 min | 65.5° |
| June | 06:04 | 12:00 | 17:56 | 11 h 53 min | 62.3° |
| July | 06:08 | 12:05 | 18:02 | 11 h 54 min | 65.3° |
| August | 06:02 | 12:02 | 18:01 | 11 h 59 min | 73.7° |
| September | 05:48 | 11:51 | 17:55 | 12 h 06 min | 85.1° |
| October | 05:36 | 11:43 | 17:50 | 12 h 13 min | 83.5° |
| November | 05:34 | 11:44 | 17:54 | 12 h 20 min | 74.3° |
| December | 05:45 | 11:56 | 18:08 | 12 h 22 min | 70.8° |
A year of daylight in Brazzaville
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 Brazzaville
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
4°collects the most energy over a year: 1298 kWh per kWp.
9°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° | 1295 | 100% | 3.15 | 1.3× |
| 4° year-round best = latitude | 1298 | 100% | 3.23 | 1.3× |
| 9° off-grid best | 1295 | 100% | 3.32 | 1.2× |
| 15° | 1281 | 99% | 3.40 | 1.3× |
| 30° | 1200 | 92% | 3.47 | 1.4× |
| 45° | 1059 | 82% | 3.35 | 1.7× |
| 60° | 870 | 67% | 3.06 | 2.2× |
| 70° | 734 | 57% | 2.78 | 2.4× |
| 90° | 509 | 39% | 2.04 | 2.1× |
A fixed array in Brazzaville produces the most over a year at 4°. The design month for an off-grid system is June: at 9° it makes 3.32 kWh per kWp a day, 3% more than at 4°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Brazzaville at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 4° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 4° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.76 | 1.55 | 1.22 | 3.72 | 24.8 °C |
| February | 4.77 | 1.87 | 1.49 | 3.76 | 25.1 °C |
| March | 5.08 | 2.58 | 2.09 | 4.06 | 25.2 °C |
| April | 4.89 | 3.27 | 2.67 | 3.95 | 25.1 °C |
| May | 4.35 | 3.47 | 2.84 | 3.54 | 24.9 °C |
| June | 3.95 | 3.39 | 2.78 | 3.23 | 23.9 °C |
| July | 4.02 | 3.32 | 2.73 | 3.28 | 23.6 °C |
| August | 4.12 | 2.98 | 2.43 | 3.33 | 24.7 °C |
| September | 4.27 | 2.48 | 2.00 | 3.41 | 25.7 °C |
| October | 4.28 | 1.89 | 1.50 | 3.39 | 25.3 °C |
| November | 4.55 | 1.51 | 1.19 | 3.57 | 24.6 °C |
| December | 4.41 | 1.49 | 1.18 | 3.44 | 24.6 °C |
| Year | 4.45 avg | 2.49 avg | 734 kWh | 1298 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 1,000 Wp of panels at 70°, versus 360 Wp at 4°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Brazzaville
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.
1.8 mrow pitch at 70°
2.1 mrow pitch at 4°
How Brazzaville compares in the Republic of the Congo
Against the other 22 places in the Republic of the Congo with climate data, for a fixed array at its best angle.
12thof 23 places in the Republic of the Congo for sunshine: 4.45 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in the Republic of the Congo: 1,298 against 1,280 kWh per kWp.
+5 mindaylight on the longest day, compared with the average place in the Republic of the Congo: 12 h 22 min against 12 h 18 min.
4°best year-round tilt here; across the Republic of the Congo it runs from 1° in Owando to 5° in Mindouli.
Of the 23 places in the Republic of the Congo, Mindouli and one other place get the most sun (4.91 peak sun hours a day) and Mossendjo the least (3.94); Brazzaville ranks 12th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.18 kWh a day here, against 1.15 kWh on average in the Republic of the Congo. The shortest day lasts 11 h 53 min, −5 min compared with the average.
Solar forecast for Brazzaville, 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 Brazzaville
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Places near Brazzaville
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A free, live card for Brazzaville: 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.