Bayankhongor · Mongolia · 46.19° N · 100.72° E
Solar position in Bayanhongor
Sun position, daylight and the best solar panel angle for Bayanhongor — computed for 46.19° N, 100.72° E, 1873 m above sea level.
The sun right now
Sun in Bayanhongor today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 06:06 | sun 18° below horizon |
| Nautical dawn | 06:41 | 12° below |
| Civil dawn | 07:16 | 6° below |
| Sunrise | 07:47 | 107° ESE |
| Golden hour ends | 08:29 | sun 6° up |
| Solar noon | 13:00 | 31.7° high |
| Golden hour starts | 17:32 | sun 6° up |
| Sunset | 18:14 | 253° WSW |
| Civil dusk | 18:45 | 6° below |
| Nautical dusk | 19:20 | 12° below |
| Astronomical dusk | 19:54 | 18° below |
| Day length | 10 h 27 min | |
Sun path diagram for Bayanhongor
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 67.2° at solar noon in Bayanhongor; on the December solstice only 20.4°. Sunrise swings from 54° NE in June to 124° SE in December — a 70° 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 | 08:51 | 13:28 | 18:05 | 9 h 14 min | 23.9° |
| February | 08:10 | 13:31 | 18:51 | 10 h 40 min | 33.3° |
| March | 07:19 | 13:24 | 19:30 | 12 h 11 min | 44.1° |
| April | 06:20 | 13:16 | 20:11 | 13 h 51 min | 55.7° |
| May | 05:38 | 13:13 | 20:49 | 15 h 12 min | 64.0° |
| June | 05:25 | 13:18 | 21:12 | 15 h 47 min | 67.2° |
| July | 05:46 | 13:23 | 21:00 | 15 h 14 min | 64.3° |
| August | 06:23 | 13:20 | 20:16 | 13 h 53 min | 55.9° |
| September | 07:02 | 13:10 | 19:17 | 12 h 15 min | 44.5° |
| October | 07:41 | 13:01 | 18:20 | 10 h 39 min | 33.1° |
| November | 08:25 | 13:02 | 17:39 | 9 h 14 min | 23.9° |
| December | 08:56 | 13:15 | 17:33 | 8 h 37 min | 20.4° |
A year of daylight in Bayanhongor
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 Bayanhongor
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
45°collects the most energy over a year: 1854 kWh per kWp.
59°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° | 1394 | 75% | 1.37 | 4.3× |
| 15° | 1644 | 89% | 2.34 | 2.6× |
| 30° | 1800 | 97% | 3.16 | 1.9× |
| 45° year-round best | 1854 | 100% | 3.80 | 1.6× |
| 46° = latitude | 1854 | 100% | 3.83 | 1.5× |
| 59° off-grid best | 1811 | 98% | 4.19 | 1.4× |
| 60° | 1804 | 97% | 4.21 | 1.4× |
| 70° | 1715 | 93% | 4.34 | 1.6× |
| 90° | 1419 | 77% | 4.25 | 2.3× |
A fixed array in Bayanhongor produces the most over a year at 45°. The design month for an off-grid system is December: at 59° it makes 4.19 kWh per kWp a day, 10% more than at 45°, and costs 2% of the yearly total. Why steep panels win winter.
Off-grid solar in Bayanhongor at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 45° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 45° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.04 | 5.16 | 4.99 | 4.43 | -18.4 °C |
| February snow | 3.16 | 5.97 | 5.69 | 5.34 | -15.2 °C |
| March snow | 4.52 | 6.37 | 5.90 | 5.92 | -6.8 °C |
| April | 5.96 | 5.43 | 4.86 | 5.81 | 2.2 °C |
| May | 6.89 | 4.86 | 4.24 | 5.59 | 8.2 °C |
| June | 6.87 | 4.34 | 3.69 | 5.07 | 14.5 °C |
| July | 6.47 | 4.29 | 3.61 | 4.86 | 17.2 °C |
| August | 5.89 | 4.76 | 4.05 | 5.07 | 14.8 °C |
| September | 5.00 | 5.65 | 4.95 | 5.51 | 8.0 °C |
| October snow | 3.51 | 5.88 | 5.32 | 5.22 | -0.3 °C |
| November snow | 2.18 | 5.17 | 4.84 | 4.36 | -9.2 °C |
| December snow | 1.65 | 4.51 | 4.34 | 3.80 | -16.6 °C |
| Year | 4.52 avg | 5.19 avg | 1715 kWh | 1854 kWh |
Sizing example. To run a 1 kWh-per-day load through July on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 330 Wp of panels at 70°, versus 310 Wp at 45°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Bayanhongor
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.
6.8 mrow pitch at 70°
6.0 mrow pitch at 45°
How Bayanhongor compares in Mongolia
Against the other 23 places in Mongolia with climate data, for a fixed array at its best angle.
5thof 24 places in Mongolia for sunshine: 4.52 peak sun hours a day on flat ground.
+5%solar energy a year compared with the average place in Mongolia: 1,854 against 1,757 kWh per kWp.
−15 mindaylight on the longest day, compared with Ulan Bator: 15 h 47 min against 16 h 02 min.
45°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); Bayanhongor ranks 5th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 3.61 kWh a day here, against 3.47 kWh on average in Mongolia. The shortest day lasts 8 h 37 min, +14 min compared with Ulan Bator.
Solar forecast for Bayanhongor, 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 Bayanhongor: 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.