Gilan Province · Iran · 37.14° N · 50.29° E
Solar position in Rūdsar
Sun position, daylight and the best solar panel angle for Rūdsar — computed for 37.14° N, 50.29° E, -23 m above sea level.
The sun right now
Sun in Rūdsar today
Saturday, 24 October 2026 · local time UTC+3:30
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:57 | sun 18° below horizon |
| Nautical dawn | 05:27 | 12° below |
| Civil dawn | 05:58 | 6° below |
| Sunrise | 06:24 | 104° ESE |
| Golden hour ends | 07:00 | sun 6° up |
| Solar noon | 11:52 | 41.1° high |
| Golden hour starts | 16:44 | sun 6° up |
| Sunset | 17:20 | 256° WSW |
| Civil dusk | 17:47 | 6° below |
| Nautical dusk | 18:17 | 12° below |
| Astronomical dusk | 18:47 | 18° below |
| Day length | 10 h 56 min | |
Sun path diagram for Rūdsar
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 76.3° at solar noon in Rūdsar; on the December solstice only 29.5°. Sunrise swings from 59° ENE in June to 119° ESE in December — a 60° 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 | 07:19 | 12:20 | 17:21 | 10 h 02 min | 33.0° |
| February | 06:50 | 12:22 | 17:54 | 11 h 04 min | 42.4° |
| March | 06:11 | 12:16 | 18:21 | 12 h 10 min | 53.2° |
| April | 05:26 | 12:07 | 18:48 | 13 h 22 min | 64.8° |
| May | 04:56 | 12:05 | 19:15 | 14 h 19 min | 73.1° |
| June | 04:49 | 12:10 | 19:32 | 14 h 43 min | 76.3° |
| July | 05:04 | 12:15 | 19:25 | 14 h 20 min | 73.3° |
| August | 05:30 | 12:11 | 18:53 | 13 h 23 min | 64.9° |
| September | 05:55 | 12:01 | 18:07 | 12 h 12 min | 53.5° |
| October | 06:22 | 11:53 | 17:24 | 11 h 02 min | 42.1° |
| November | 06:53 | 11:54 | 16:55 | 10 h 02 min | 32.9° |
| December | 07:18 | 12:06 | 16:55 | 9 h 36 min | 29.5° |
A year of daylight in Rūdsar
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 Rūdsar
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
29°collects the most energy over a year: 1395 kWh per kWp.
60°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° | 1247 | 89% | 1.49 | 3.7× |
| 15° | 1360 | 97% | 2.01 | 2.8× |
| 29° year-round best | 1395 | 100% | 2.39 | 2.2× |
| 30° | 1395 | 100% | 2.41 | 2.1× |
| 37° = latitude | 1385 | 99% | 2.55 | 1.9× |
| 45° | 1353 | 97% | 2.66 | 1.7× |
| 60° off-grid best | 1235 | 88% | 2.75 | 1.4× |
| 70° | 1119 | 80% | 2.72 | 1.3× |
| 90° | 819 | 59% | 2.43 | 1.6× |
A fixed array in Rūdsar produces the most over a year at 29°. The design month for an off-grid system is December: at 60° it makes 2.75 kWh per kWp a day, 15% more than at 29°, and costs 12% of the yearly total. Why steep panels win winter.
Off-grid solar in Rūdsar at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 29° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 29° | Mean temp. |
|---|---|---|---|---|---|
| January | 2.10 | 3.24 | 2.85 | 2.60 | 6.5 °C |
| February | 2.69 | 3.30 | 2.90 | 2.96 | 6.8 °C |
| March | 3.59 | 3.53 | 3.06 | 3.53 | 9.7 °C |
| April | 4.59 | 3.52 | 3.01 | 4.03 | 13.1 °C |
| May | 6.01 | 3.71 | 3.10 | 4.82 | 18.8 °C |
| June | 6.92 | 3.70 | 3.03 | 5.21 | 23.2 °C |
| July | 6.47 | 3.69 | 3.00 | 4.92 | 25.5 °C |
| August | 5.97 | 4.12 | 3.35 | 4.86 | 25.9 °C |
| September | 4.74 | 4.33 | 3.57 | 4.35 | 23.0 °C |
| October | 3.34 | 3.92 | 3.30 | 3.47 | 18.4 °C |
| November | 2.27 | 3.35 | 2.88 | 2.69 | 12.4 °C |
| December | 1.85 | 3.11 | 2.72 | 2.39 | 8.3 °C |
| Year | 4.22 avg | 3.63 avg | 1119 kWh | 1395 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 430 Wp of panels at 70°, versus 490 Wp at 29°. The steep array is 12% smaller for the same winter. Size your own system.
Row spacing in Rūdsar
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.
4.5 mrow pitch at 70°
3.7 mrow pitch at 29°
How Rūdsar compares in Iran
Against the other 422 places in Iran with climate data, for a fixed array at its best angle.
402ndof 423 places in Iran for sunshine, shared: 4.22 peak sun hours a day on flat ground.
−21%solar energy a year compared with the average place in Iran: 1,395 against 1,760 kWh per kWp.
+8 mindaylight on the longest day, compared with Tehran: 14 h 43 min against 14 h 35 min.
29°best year-round tilt here; across Iran it runs from 24° in Kīsh to 33° in Khūy.
Of the 423 places in Iran, Jālq gets the most sun (6.10 peak sun hours a day) and Bandar-e Anzalī the least (3.92); Rūdsar ranks joint 402nd. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 2.72 kWh a day here, against 2.96 kWh on average in Iran. The shortest day lasts 9 h 36 min, −8 min compared with Tehran.
Solar forecast for Rūdsar, 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 Rūdsar
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A free, live card for Rūdsar: 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.