Ilam Province · Iran · 33.14° N · 47.38° E
Solar position in Darreh Shahr
Sun position, daylight and the best solar panel angle for Darreh Shahr — computed for 33.14° N, 47.38° E, 667 m above sea level.
The sun right now
Sun in Darreh Shahr today
Saturday, 24 October 2026 · local time UTC+3:30
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:08 | sun 18° below horizon |
| Nautical dawn | 05:37 | 12° below |
| Civil dawn | 06:06 | 6° below |
| Sunrise | 06:31 | 103° ESE |
| Golden hour ends | 07:05 | sun 6° up |
| Solar noon | 12:04 | 45.1° high |
| Golden hour starts | 17:03 | sun 6° up |
| Sunset | 17:37 | 256° WSW |
| Civil dusk | 18:02 | 6° below |
| Nautical dusk | 18:31 | 12° below |
| Astronomical dusk | 19:00 | 18° below |
| Day length | 11 h 05 min | |
Sun path diagram for Darreh Shahr
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 80.3° at solar noon in Darreh Shahr; on the December solstice only 33.4°. Sunrise swings from 61° ENE in June to 118° ESE in December — a 57° 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 | 07:22 | 12:31 | 17:41 | 10 h 20 min | 37.0° |
| February | 06:58 | 12:34 | 18:10 | 11 h 12 min | 46.4° |
| March | 06:23 | 12:27 | 18:32 | 12 h 09 min | 57.2° |
| April | 05:43 | 12:19 | 18:55 | 13 h 11 min | 68.8° |
| May | 05:17 | 12:17 | 19:17 | 14 h 00 min | 77.1° |
| June | 05:11 | 12:22 | 19:32 | 14 h 21 min | 80.3° |
| July | 05:26 | 12:26 | 19:27 | 14 h 01 min | 77.3° |
| August | 05:47 | 12:23 | 18:59 | 13 h 12 min | 68.9° |
| September | 06:07 | 12:13 | 18:18 | 12 h 11 min | 57.5° |
| October | 06:29 | 12:04 | 17:40 | 11 h 11 min | 46.1° |
| November | 06:56 | 12:06 | 17:15 | 10 h 19 min | 36.9° |
| December | 07:19 | 12:18 | 17:17 | 9 h 58 min | 33.4° |
A year of daylight in Darreh Shahr
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 Darreh Shahr
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: 1788 kWh per kWp.
54°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° | 1595 | 89% | 2.26 | 2.9× |
| 15° | 1743 | 97% | 3.07 | 2.1× |
| 29° year-round best | 1788 | 100% | 3.64 | 1.6× |
| 30° | 1788 | 100% | 3.68 | 1.6× |
| 33° = latitude | 1784 | 100% | 3.77 | 1.5× |
| 45° | 1728 | 97% | 4.06 | 1.3× |
| 54° off-grid best | 1643 | 92% | 4.16 | 1.2× |
| 60° | 1568 | 88% | 4.18 | 1.3× |
| 70° | 1411 | 79% | 4.11 | 1.5× |
| 90° | 1011 | 57% | 3.63 | 2.7× |
A fixed array in Darreh Shahr produces the most over a year at 29°. The design month for an off-grid system is December: at 54° it makes 4.16 kWh per kWp a day, 14% more than at 29°, and costs 8% of the yearly total. Why steep panels win winter.
Off-grid solar in Darreh Shahr 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 | 2.93 | 4.61 | 4.09 | 3.75 | 5.5 °C |
| February | 3.86 | 4.86 | 4.27 | 4.37 | 7.4 °C |
| March | 5.13 | 5.00 | 4.32 | 5.08 | 12.0 °C |
| April | 5.99 | 4.27 | 3.60 | 5.11 | 17.2 °C |
| May | 7.13 | 3.89 | 3.19 | 5.42 | 23.7 °C |
| June | 8.30 | 3.73 | 2.98 | 5.80 | 30.0 °C |
| July | 7.81 | 3.86 | 3.04 | 5.53 | 33.2 °C |
| August | 7.27 | 4.52 | 3.58 | 5.58 | 32.8 °C |
| September | 6.32 | 5.47 | 4.42 | 5.60 | 28.2 °C |
| October | 4.62 | 5.35 | 4.44 | 4.76 | 21.9 °C |
| November | 3.38 | 5.09 | 4.39 | 4.12 | 12.7 °C |
| December | 2.76 | 4.67 | 4.11 | 3.64 | 7.6 °C |
| Year | 5.47 avg | 4.61 avg | 1411 kWh | 1788 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 400 Wp of panels at 70°, versus 320 Wp at 29°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Darreh Shahr
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.
3.9 mrow pitch at 70°
3.4 mrow pitch at 29°
How Darreh Shahr compares in Iran
Against the other 422 places in Iran with climate data, for a fixed array at its best angle.
179thof 423 places in Iran for sunshine, shared: 5.47 peak sun hours a day on flat ground.
+2%solar energy a year compared with the average place in Iran: 1,788 against 1,760 kWh per kWp.
−14 mindaylight on the longest day, compared with Tehran: 14 h 21 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); Darreh Shahr ranks joint 179th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 2.98 kWh a day here, against 2.96 kWh on average in Iran. The shortest day lasts 9 h 58 min, +13 min compared with Tehran.
Solar forecast for Darreh Shahr, 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 Darreh Shahr: 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.