Île-de-France · France · 48.68° N · 2.13° E
Solar position in Gif-sur-Yvette
Sun position, daylight and the best solar panel angle for Gif-sur-Yvette — computed for 48.68° N, 2.13° E, 147 m above sea level.
The sun right now
Sun in Gif-sur-Yvette today
Saturday, 24 October 2026 · local time UTC+2
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 06:39 | sun 18° below horizon |
| Nautical dawn | 07:16 | 12° below |
| Civil dawn | 07:52 | 6° below |
| Sunrise | 08:25 | 107° ESE |
| Golden hour ends | 09:09 | sun 6° up |
| Solar noon | 13:35 | 29.5° high |
| Golden hour starts | 18:00 | sun 6° up |
| Sunset | 18:45 | 253° WSW |
| Civil dusk | 19:17 | 6° below |
| Nautical dusk | 19:54 | 12° below |
| Astronomical dusk | 20:30 | 18° below |
| Day length | 10 h 20 min | |
Sun path diagram for Gif-sur-Yvette
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 Gif-sur-Yvette; on the December solstice only 17.9°. 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 | 08:34 | 13:02 | 17:31 | 8 h 58 min | 21.5° |
| February | 07:48 | 13:05 | 18:22 | 10 h 33 min | 30.9° |
| March | 06:52 | 12:58 | 19:05 | 12 h 13 min | 41.7° |
| April | 06:49 | 13:50 | 20:51 | 14 h 02 min | 53.3° |
| May | 06:03 | 13:48 | 21:33 | 15 h 30 min | 61.6° |
| June | 05:48 | 13:53 | 21:57 | 16 h 09 min | 64.8° |
| July | 06:11 | 13:57 | 21:43 | 15 h 32 min | 61.7° |
| August | 06:52 | 13:54 | 20:55 | 14 h 03 min | 53.3° |
| September | 07:36 | 13:44 | 19:51 | 12 h 15 min | 41.9° |
| October | 08:20 | 13:35 | 18:50 | 10 h 30 min | 30.5° |
| November | 08:08 | 12:37 | 17:05 | 8 h 56 min | 21.4° |
| December | 08:41 | 12:49 | 16:57 | 8 h 16 min | 17.9° |
A year of daylight in Gif-sur-Yvette
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 Gif-sur-Yvette
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: 1185 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° | 980 | 83% | 0.61 | 7.8× |
| 15° | 1109 | 94% | 0.95 | 5.1× |
| 30° | 1176 | 99% | 1.24 | 3.8× |
| 38° year-round best | 1185 | 100% | 1.36 | 3.4× |
| 45° | 1178 | 99% | 1.45 | 3.0× |
| 49° = latitude | 1167 | 98% | 1.49 | 2.8× |
| 60° | 1113 | 94% | 1.57 | 2.5× |
| 70° off-grid best | 1036 | 87% | 1.59 | 2.3× |
| 90° | 813 | 69% | 1.51 | 1.9× |
A fixed array in Gif-sur-Yvette produces the most over a year at 38°. The design month for an off-grid system is December: at 70° it makes 1.59 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 Gif-sur-Yvette 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 | 0.96 | 1.91 | 1.68 | 1.49 | 3.1 °C |
| February | 1.75 | 2.80 | 2.48 | 2.37 | 3.6 °C |
| March | 2.97 | 3.63 | 3.19 | 3.37 | 6.6 °C |
| April | 4.51 | 4.21 | 3.65 | 4.34 | 10.2 °C |
| May | 5.23 | 3.94 | 3.36 | 4.43 | 13.6 °C |
| June | 5.77 | 3.94 | 3.30 | 4.58 | 17.3 °C |
| July | 5.59 | 3.98 | 3.31 | 4.50 | 19.2 °C |
| August | 4.76 | 4.03 | 3.37 | 4.20 | 18.9 °C |
| September | 3.72 | 4.15 | 3.53 | 3.89 | 15.6 °C |
| October | 2.19 | 3.15 | 2.71 | 2.69 | 11.6 °C |
| November | 1.16 | 2.18 | 1.90 | 1.72 | 6.9 °C |
| December | 0.80 | 1.81 | 1.59 | 1.36 | 3.6 °C |
| Year | 3.29 avg | 3.31 avg | 1036 kWh | 1185 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 740 Wp of panels at 70°, versus 870 Wp at 38°. The steep array is 15% smaller for the same winter. Size your own system.
Row spacing in Gif-sur-Yvette
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°
6.3 mrow pitch at 38°
How Gif-sur-Yvette compares in France
Against the other 656 places in France with climate data, for a fixed array at its best angle.
321stof 657 places in France for sunshine, shared: 3.29 peak sun hours a day on flat ground.
−6%solar energy a year compared with the average place in France: 1,185 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); Gif-sur-Yvette ranks joint 321st. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.59 kWh a day here, against 1.86 kWh on average in France. The shortest day lasts 8 h 16 min, +1 min compared with Paris.
Solar forecast for Gif-sur-Yvette, 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 Gif-sur-Yvette: 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.