Irkutsk Oblast · Russia · 56.80° N · 105.79° E
Solar position in Ust’-Kut
Sun position, daylight and the best solar panel angle for Ust’-Kut — computed for 56.80° N, 105.79° E, 285 m above sea level.
The sun right now
Sun in Ust’-Kut today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:42 | sun 18° below horizon |
| Nautical dawn | 06:26 | 12° below |
| Civil dawn | 07:10 | 6° below |
| Sunrise | 07:50 | 111° ESE |
| Golden hour ends | 08:46 | sun 6° up |
| Solar noon | 12:40 | 21.1° high |
| Golden hour starts | 16:34 | sun 6° up |
| Sunset | 17:30 | 249° WSW |
| Civil dusk | 18:10 | 6° below |
| Nautical dusk | 18:54 | 12° below |
| Astronomical dusk | 19:38 | 18° below |
| Day length | 9 h 40 min | |
Sun path diagram for Ust’-Kut
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 56.6° at solar noon in Ust’-Kut; on the December solstice only 9.9°. Sunrise swings from 42° NE in June to 135° SE in December — a 93° 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 | 09:14 | 13:08 | 17:01 | 7 h 47 min | 13.4° |
| February | 08:10 | 13:10 | 18:11 | 10 h 00 min | 22.7° |
| March | 06:57 | 13:04 | 19:12 | 12 h 15 min | 33.5° |
| April | 05:34 | 12:55 | 20:17 | 14 h 43 min | 45.1° |
| May | 04:29 | 12:53 | 21:18 | 16 h 49 min | 53.4° |
| June | 04:03 | 12:58 | 21:53 | 17 h 50 min | 56.6° |
| July | 04:35 | 13:03 | 21:29 | 16 h 54 min | 53.7° |
| August | 05:36 | 12:59 | 20:22 | 14 h 46 min | 45.3° |
| September | 06:39 | 12:49 | 18:59 | 12 h 21 min | 33.9° |
| October | 07:41 | 12:41 | 17:40 | 9 h 59 min | 22.5° |
| November | 08:49 | 12:42 | 16:35 | 7 h 47 min | 13.4° |
| December | 09:31 | 12:54 | 16:17 | 6 h 46 min | 9.9° |
A year of daylight in Ust’-Kut
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 Ust’-Kut
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
50°collects the most energy over a year: 1254 kWh per kWp.
79°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° | 899 | 72% | 0.34 | 13.7× |
| 15° | 1075 | 86% | 0.80 | 6.2× |
| 30° | 1194 | 95% | 1.22 | 4.1× |
| 45° | 1250 | 100% | 1.56 | 3.2× |
| 50° year-round best | 1254 | 100% | 1.65 | 3.0× |
| 57° = latitude | 1246 | 99% | 1.77 | 2.8× |
| 60° | 1238 | 99% | 1.81 | 2.7× |
| 70° | 1194 | 95% | 1.90 | 2.5× |
| 79° off-grid best | 1130 | 90% | 1.95 | 2.4× |
| 90° | 1024 | 82% | 1.94 | 2.2× |
A fixed array in Ust’-Kut produces the most over a year at 50°. The design month for an off-grid system is December: at 79° it makes 1.95 kWh per kWp a day, 18% more than at 50°, and costs 10% of the yearly total. Why steep panels win winter.
Off-grid solar in Ust’-Kut at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 50° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 50° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 0.73 | 2.58 | 2.53 | 2.23 | -23.5 °C |
| February snow | 1.62 | 3.78 | 3.67 | 3.40 | -20.3 °C |
| March snow | 2.89 | 4.65 | 4.38 | 4.29 | -11.3 °C |
| April snow | 4.32 | 5.23 | 4.78 | 4.96 | -3.6 °C |
| May | 5.12 | 4.37 | 3.84 | 4.54 | 5.7 °C |
| June | 5.72 | 4.36 | 3.70 | 4.53 | 14.8 °C |
| July | 5.28 | 4.22 | 3.54 | 4.28 | 17.1 °C |
| August | 4.32 | 4.20 | 3.58 | 4.09 | 14.1 °C |
| September | 2.76 | 3.55 | 3.12 | 3.29 | 6.1 °C |
| October snow | 1.43 | 2.59 | 2.35 | 2.24 | -3.1 °C |
| November snow | 0.74 | 2.03 | 1.92 | 1.73 | -14.8 °C |
| December snow | 0.47 | 1.95 | 1.90 | 1.65 | -23.0 °C |
| Year | 2.96 avg | 3.62 avg | 1194 kWh | 1254 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 620 Wp of panels at 70°, versus 710 Wp at 50°. The steep array is 13% smaller for the same winter. Size your own system.
Row spacing in Ust’-Kut
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.
16.9 mrow pitch at 70°
14.5 mrow pitch at 50°
How Ust’-Kut compares in Russia
Against the other 979 places in Russia with climate data, for a fixed array at its best angle.
564thof 980 places in Russia for sunshine, shared: 2.96 peak sun hours a day on flat ground.
+5%solar energy a year compared with the average place in Russia: 1,254 against 1,196 kWh per kWp.
+17 mindaylight on the longest day, compared with Moscow: 17 h 50 min against 17 h 34 min.
50°best year-round tilt here; across Russia it runs from 32° in Derbent to 54° in Yakutsk.
Of the 980 places in Russia, Novorossiysk gets the most sun (3.96 peak sun hours a day) and Polyarnyy the least (1.93); Ust’-Kut ranks joint 564th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.90 kWh a day here, against 1.31 kWh on average in Russia. The shortest day lasts 6 h 46 min, −15 min compared with Moscow.
Solar forecast for Ust’-Kut, 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 Ust’-Kut: 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.