Île-de-France · France · 48.64° N · 1.83° E
Solar position in Rambouillet
Sun position, daylight and the best solar panel angle for Rambouillet — computed for 48.64° N, 1.83° E, 159 m above sea level.
The sun right now
Sun in Rambouillet today
Sunday, 25 October 2026 · local time UTC+2
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:42 | sun 18° below horizon |
| Nautical dawn | 06:18 | 12° below |
| Civil dawn | 06:55 | 6° below |
| Sunrise | 07:27 | 108° ESE |
| Golden hour ends | 08:12 | sun 6° up |
| Solar noon | 12:36 | 29.2° high |
| Golden hour starts | 17:00 | sun 6° up |
| Sunset | 17:44 | 252° WSW |
| Civil dusk | 18:17 | 6° below |
| Nautical dusk | 18:53 | 12° below |
| Astronomical dusk | 19:30 | 18° below |
| Day length | 10 h 17 min | |
Sun path diagram for Rambouillet
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 64.8° at solar noon in Rambouillet; on the December solstice only 18.0°. Sunrise swings from 52° NE in June to 126° SE in December — a 74° 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 | 08:35 | 13:04 | 17:33 | 8 h 58 min | 21.6° |
| February | 07:49 | 13:06 | 18:23 | 10 h 34 min | 30.9° |
| March | 06:53 | 13:00 | 19:06 | 12 h 13 min | 41.7° |
| April | 06:50 | 13:51 | 20:52 | 14 h 02 min | 53.3° |
| May | 06:04 | 13:49 | 21:34 | 15 h 30 min | 61.6° |
| June | 05:50 | 13:54 | 21:58 | 16 h 09 min | 64.8° |
| July | 06:12 | 13:59 | 21:44 | 15 h 32 min | 61.8° |
| August | 06:54 | 13:55 | 20:56 | 14 h 02 min | 53.4° |
| September | 07:37 | 13:45 | 19:52 | 12 h 15 min | 42.0° |
| October | 08:21 | 13:37 | 18:52 | 10 h 30 min | 30.6° |
| November | 08:09 | 12:38 | 17:06 | 8 h 57 min | 21.4° |
| December | 08:42 | 12:50 | 16:59 | 8 h 17 min | 18.0° |
A year of daylight in Rambouillet
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 Rambouillet
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
38°collects the most energy over a year: 1188 kWh per kWp.
70°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 | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 981 | 83% | 0.62 | 7.7× |
| 15° | 1111 | 94% | 0.97 | 5.0× |
| 30° | 1178 | 99% | 1.27 | 3.7× |
| 38° year-round best | 1188 | 100% | 1.40 | 3.3× |
| 45° | 1180 | 99% | 1.49 | 2.9× |
| 49° = latitude | 1169 | 98% | 1.53 | 2.8× |
| 60° | 1116 | 94% | 1.62 | 2.5× |
| 70° off-grid best | 1039 | 87% | 1.64 | 2.2× |
| 90° | 815 | 69% | 1.55 | 1.8× |
A fixed array in Rambouillet produces the most over a year at 38°. The design month for an off-grid system is December: at 70° it makes 1.64 kWh per kWp a day, 17% more than at 38°, and costs 13% of the yearly total. Why steep panels win winter.
Off-grid solar in Rambouillet at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 38° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 38° | Mean temp. |
|---|---|---|---|---|---|
| January | 0.97 | 1.93 | 1.71 | 1.51 | 3.2 °C |
| February | 1.76 | 2.81 | 2.49 | 2.38 | 3.7 °C |
| March | 2.97 | 3.61 | 3.17 | 3.36 | 6.6 °C |
| April | 4.50 | 4.19 | 3.63 | 4.33 | 10.1 °C |
| May | 5.23 | 3.94 | 3.36 | 4.43 | 13.5 °C |
| June | 5.76 | 3.93 | 3.30 | 4.58 | 17.2 °C |
| July | 5.59 | 3.98 | 3.31 | 4.50 | 19.1 °C |
| August | 4.77 | 4.03 | 3.37 | 4.20 | 18.8 °C |
| September | 3.74 | 4.16 | 3.54 | 3.91 | 15.5 °C |
| October | 2.19 | 3.14 | 2.71 | 2.69 | 11.6 °C |
| November | 1.18 | 2.21 | 1.93 | 1.74 | 7.0 °C |
| December | 0.81 | 1.86 | 1.64 | 1.40 | 3.7 °C |
| Year | 3.30 avg | 3.32 avg | 1039 kWh | 1188 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 720 Wp of panels at 70°, versus 840 Wp at 38°. The steep array is 15% smaller for the same winter. Size your own system.
Row spacing in Rambouillet
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.
7.8 mrow pitch at 70°
6.2 mrow pitch at 38°
How Rambouillet compares in France
Against the other 656 places in France with climate data, for a fixed array at its best angle.
309thof 657 places in France for sunshine, shared: 3.30 peak sun hours a day on flat ground.
−6%solar energy a year compared with the average place in France: 1,188 against 1,261 kWh per kWp.
−2 mindaylight on the longest day, compared with Paris: 16 h 09 min against 16 h 11 min.
38°best year-round tilt here; across France it runs from 33° in Ajaccio to 39° in Lille.
Of the 657 places in France, Marseille 12 and 5 other places get the most sun (4.46 peak sun hours a day) and Maubeuge and one other place the least (3.10); Rambouillet ranks joint 309th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.64 kWh a day here, against 1.86 kWh on average in France. The shortest day lasts 8 h 17 min, +2 min compared with Paris.
Solar forecast for Rambouillet, 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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A free, live card for Rambouillet: 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.