Bayan-Ölgii Province · Mongolia · 48.97° N · 89.96° E
Solar position in Ölgii
Sun position, daylight and the best solar panel angle for Ölgii — computed for 48.97° N, 89.96° E, 1715 m above sea level.
The sun right now
Sun in Ölgii today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:49 | sun 18° below horizon |
| Nautical dawn | 06:26 | 12° below |
| Civil dawn | 07:03 | 6° below |
| Sunrise | 07:35 | 108° ESE |
| Golden hour ends | 08:20 | sun 6° up |
| Solar noon | 12:43 | 28.9° high |
| Golden hour starts | 17:07 | sun 6° up |
| Sunset | 17:52 | 252° WSW |
| Civil dusk | 18:24 | 6° below |
| Nautical dusk | 19:01 | 12° below |
| Astronomical dusk | 19:38 | 18° below |
| Day length | 10 h 16 min | |
Sun path diagram for Ölgii
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 64.5° at solar noon in Ölgii; on the December solstice only 17.6°. Sunrise swings from 51° NE in June to 126° SE in December — a 75° 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 | 08:43 | 13:11 | 17:39 | 8 h 55 min | 21.2° |
| February | 07:58 | 13:14 | 18:29 | 10 h 32 min | 30.5° |
| March | 07:01 | 13:07 | 19:13 | 12 h 12 min | 41.3° |
| April | 05:58 | 12:59 | 20:00 | 14 h 02 min | 52.9° |
| May | 05:11 | 12:56 | 20:43 | 15 h 32 min | 61.2° |
| June | 04:55 | 13:01 | 21:07 | 16 h 12 min | 64.5° |
| July | 05:18 | 13:06 | 20:53 | 15 h 35 min | 61.5° |
| August | 06:00 | 13:03 | 20:05 | 14 h 05 min | 53.1° |
| September | 06:44 | 12:53 | 19:00 | 12 h 16 min | 41.7° |
| October | 07:29 | 12:44 | 17:59 | 10 h 30 min | 30.3° |
| November | 08:18 | 12:45 | 17:13 | 8 h 55 min | 21.1° |
| December | 08:51 | 12:58 | 17:04 | 8 h 14 min | 17.6° |
A year of daylight in Ölgii
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 Ölgii
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
46°collects the most energy over a year: 1679 kWh per kWp.
77°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° | 1267 | 75% | 1.00 | 5.6× |
| 15° | 1489 | 89% | 1.72 | 3.3× |
| 30° | 1629 | 97% | 2.36 | 2.4× |
| 45° | 1679 | 100% | 2.86 | 1.9× |
| 46° year-round best | 1679 | 100% | 2.88 | 1.9× |
| 49° = latitude | 1677 | 100% | 2.96 | 1.8× |
| 60° | 1638 | 98% | 3.18 | 1.7× |
| 70° | 1561 | 93% | 3.29 | 1.6× |
| 77° off-grid best | 1485 | 88% | 3.32 | 1.6× |
| 90° | 1301 | 77% | 3.25 | 2.0× |
A fixed array in Ölgii produces the most over a year at 46°. The design month for an off-grid system is December: at 77° it makes 3.32 kWh per kWp a day, 15% more than at 46°, and costs 12% of the yearly total. Why steep panels win winter.
Off-grid solar in Ölgii at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 46° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 46° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 1.60 | 4.21 | 4.11 | 3.65 | -21.3 °C |
| February snow | 2.69 | 5.17 | 5.00 | 4.68 | -18.6 °C |
| March snow | 3.95 | 5.66 | 5.32 | 5.31 | -11.0 °C |
| April snow | 5.26 | 5.31 | 4.82 | 5.42 | -1.7 °C |
| May | 6.35 | 4.71 | 4.18 | 5.35 | 4.1 °C |
| June | 6.66 | 4.40 | 3.80 | 5.07 | 10.5 °C |
| July | 6.35 | 4.40 | 3.77 | 4.95 | 12.4 °C |
| August | 5.70 | 4.85 | 4.21 | 5.14 | 10.2 °C |
| September | 4.52 | 5.39 | 4.81 | 5.25 | 3.7 °C |
| October snow | 2.80 | 4.95 | 4.54 | 4.33 | -3.5 °C |
| November snow | 1.63 | 3.75 | 3.55 | 3.21 | -12.3 °C |
| December snow | 1.21 | 3.40 | 3.29 | 2.88 | -19.0 °C |
| Year | 4.07 avg | 4.68 avg | 1561 kWh | 1679 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 360 Wp of panels at 70°, versus 410 Wp at 46°. The steep array is 12% smaller for the same winter. Size your own system.
Row spacing in Ölgii
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.
8.0 mrow pitch at 70°
7.0 mrow pitch at 46°
How Ölgii compares in Mongolia
Against the other 23 places in Mongolia with climate data, for a fixed array at its best angle.
19thof 24 places in Mongolia for sunshine: 4.07 peak sun hours a day on flat ground.
−4%solar energy a year compared with the average place in Mongolia: 1,679 against 1,757 kWh per kWp.
+10 mindaylight on the longest day, compared with Ulan Bator: 16 h 12 min against 16 h 02 min.
46°best year-round tilt here; across Mongolia it runs from 43° in Ulaangom to 48° in Mörön.
Of the 24 places in Mongolia, Bogd gets the most sun (4.71 peak sun hours a day) and Sühbaatar the least (3.82); Ölgii ranks 19th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 3.29 kWh a day here, against 3.47 kWh on average in Mongolia. The shortest day lasts 8 h 14 min, −9 min compared with Ulan Bator.
Solar forecast for Ölgii, 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 Ölgii
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A free, live card for Ölgii: 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.