Sughd · Tajikistan · 39.91° N · 69.00° E
Solar position in Istaravshan
Sun position, daylight and the best solar panel angle for Istaravshan — computed for 39.91° N, 69.00° E, 979 m above sea level.
The sun right now
Sun in Istaravshan today
Saturday, 24 October 2026 · local time UTC+5
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:13 | sun 18° below horizon |
| Nautical dawn | 05:44 | 12° below |
| Civil dawn | 06:16 | 6° below |
| Sunrise | 06:43 | 105° ESE |
| Golden hour ends | 07:21 | sun 6° up |
| Solar noon | 12:07 | 38.3° high |
| Golden hour starts | 16:54 | sun 6° up |
| Sunset | 17:32 | 255° WSW |
| Civil dusk | 17:59 | 6° below |
| Nautical dusk | 18:31 | 12° below |
| Astronomical dusk | 19:02 | 18° below |
| Day length | 10 h 49 min | |
Sun path diagram for Istaravshan
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 73.5° at solar noon in Istaravshan; on the December solstice only 26.7°. Sunrise swings from 58° ENE in June to 120° ESE in December — a 62° 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 | 07:40 | 12:35 | 17:29 | 9 h 49 min | 30.2° |
| February | 07:09 | 12:37 | 18:06 | 10 h 57 min | 39.6° |
| March | 06:26 | 12:31 | 18:36 | 12 h 10 min | 50.4° |
| April | 05:38 | 12:22 | 19:08 | 13 h 30 min | 62.0° |
| May | 05:04 | 12:20 | 19:37 | 14 h 33 min | 70.3° |
| June | 04:55 | 12:25 | 19:55 | 15 h 00 min | 73.5° |
| July | 05:12 | 12:30 | 19:47 | 14 h 35 min | 70.5° |
| August | 05:41 | 12:27 | 19:12 | 13 h 31 min | 62.2° |
| September | 06:10 | 12:16 | 18:23 | 12 h 13 min | 50.8° |
| October | 06:40 | 12:08 | 17:36 | 10 h 56 min | 39.4° |
| November | 07:15 | 12:09 | 17:03 | 9 h 48 min | 30.2° |
| December | 07:41 | 12:21 | 17:02 | 9 h 20 min | 26.7° |
A year of daylight in Istaravshan
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 Istaravshan
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
33°collects the most energy over a year: 1606 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° | 1397 | 87% | 1.49 | 4.1× |
| 15° | 1544 | 96% | 2.06 | 3.0× |
| 30° | 1605 | 100% | 2.53 | 2.3× |
| 33° year-round best | 1606 | 100% | 2.61 | 2.2× |
| 40° = latitude | 1595 | 99% | 2.78 | 2.0× |
| 45° | 1575 | 98% | 2.88 | 1.9× |
| 60° | 1459 | 91% | 3.07 | 1.7× |
| 70° off-grid best | 1337 | 83% | 3.11 | 1.5× |
| 90° | 1009 | 63% | 2.96 | 2.0× |
A fixed array in Istaravshan produces the most over a year at 33°. The design month for an off-grid system is December: at 70° it makes 3.11 kWh per kWp a day, 19% more than at 33°, and costs 17% of the yearly total. Why steep panels win winter.
Off-grid solar in Istaravshan at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 33° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 33° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.01 | 3.40 | 3.12 | 2.72 | -4.4 °C |
| February snow | 2.77 | 3.96 | 3.61 | 3.37 | -2.6 °C |
| March | 3.94 | 4.11 | 3.65 | 4.12 | 3.6 °C |
| April | 5.18 | 4.17 | 3.63 | 4.73 | 8.9 °C |
| May | 6.32 | 4.01 | 3.42 | 5.13 | 14.2 °C |
| June | 7.31 | 4.00 | 3.34 | 5.50 | 19.0 °C |
| July | 7.48 | 4.26 | 3.53 | 5.68 | 21.5 °C |
| August | 6.85 | 4.90 | 4.09 | 5.75 | 20.4 °C |
| September | 5.65 | 5.63 | 4.79 | 5.63 | 15.5 °C |
| October | 3.78 | 5.03 | 4.40 | 4.47 | 8.9 °C |
| November | 2.28 | 3.66 | 3.28 | 3.04 | 2.3 °C |
| December snow | 1.79 | 3.40 | 3.11 | 2.61 | -2.9 °C |
| Year | 4.62 avg | 4.21 avg | 1337 kWh | 1606 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 380 Wp of panels at 70°, versus 450 Wp at 33°. The steep array is 16% smaller for the same winter. Size your own system.
Row spacing in Istaravshan
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.
5.0 mrow pitch at 70°
4.2 mrow pitch at 33°
How Istaravshan compares in Tajikistan
Against the other 30 places in Tajikistan with climate data, for a fixed array at its best angle.
28thof 31 places in Tajikistan for sunshine, shared: 4.62 peak sun hours a day on flat ground.
−2%solar energy a year compared with the average place in Tajikistan: 1,606 against 1,633 kWh per kWp.
+9 mindaylight on the longest day, compared with Dushanbe: 15 h 00 min against 14 h 52 min.
33°best year-round tilt here; across Tajikistan it runs from 31° in Dushanbe to 33° in Isfara.
Of the 31 places in Tajikistan, Zarhalol gets the most sun (5.11 peak sun hours a day) and Muchun the least (4.60); Istaravshan ranks joint 28th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 3.11 kWh a day here, against 3.03 kWh on average in Tajikistan. The shortest day lasts 9 h 20 min, −8 min compared with Dushanbe.
Solar forecast for Istaravshan, 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 Istaravshan: 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.