Övörhangay · Mongolia · 46.26° N · 102.78° E
Solar position in Arvayheer
Sun position, daylight and the best solar panel angle for Arvayheer — computed for 46.26° N, 102.78° E, 1838 m above sea level.
The sun right now
Sun in Arvayheer today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:58 | sun 18° below horizon |
| Nautical dawn | 06:33 | 12° below |
| Civil dawn | 07:08 | 6° below |
| Sunrise | 07:39 | 107° ESE |
| Golden hour ends | 08:21 | sun 6° up |
| Solar noon | 12:52 | 31.7° high |
| Golden hour starts | 17:23 | sun 6° up |
| Sunset | 18:05 | 253° WSW |
| Civil dusk | 18:36 | 6° below |
| Nautical dusk | 19:11 | 12° below |
| Astronomical dusk | 19:46 | 18° below |
| Day length | 10 h 26 min | |
Sun path diagram for Arvayheer
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 Arvayheer; on the December solstice only 20.3°. 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 | 08:43 | 13:20 | 17:56 | 9 h 13 min | 23.9° |
| February | 08:02 | 13:22 | 18:42 | 10 h 40 min | 33.2° |
| March | 07:10 | 13:16 | 19:22 | 12 h 11 min | 44.0° |
| April | 06:12 | 13:07 | 20:03 | 13 h 51 min | 55.6° |
| May | 05:29 | 13:05 | 20:41 | 15 h 12 min | 63.9° |
| June | 05:16 | 13:10 | 21:04 | 15 h 48 min | 67.2° |
| July | 05:37 | 13:15 | 20:52 | 15 h 15 min | 64.2° |
| August | 06:14 | 13:11 | 20:08 | 13 h 54 min | 55.8° |
| September | 06:54 | 13:01 | 19:09 | 12 h 15 min | 44.4° |
| October | 07:33 | 12:53 | 18:12 | 10 h 39 min | 33.1° |
| November | 08:17 | 12:54 | 17:31 | 9 h 13 min | 23.9° |
| December | 08:48 | 13:06 | 17:24 | 8 h 36 min | 20.3° |
A year of daylight in Arvayheer
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 Arvayheer
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: 1833 kWh per kWp.
61°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° | 1373 | 75% | 1.34 | 4.3× |
| 15° | 1622 | 88% | 2.26 | 2.7× |
| 30° | 1778 | 97% | 3.06 | 1.9× |
| 45° year-round best | 1833 | 100% | 3.67 | 1.6× |
| 46° = latitude | 1833 | 100% | 3.70 | 1.6× |
| 60° | 1785 | 97% | 4.06 | 1.5× |
| 61° off-grid best | 1778 | 97% | 4.08 | 1.5× |
| 70° | 1698 | 93% | 4.18 | 1.7× |
| 90° | 1404 | 77% | 4.10 | 2.4× |
A fixed array in Arvayheer produces the most over a year at 45°. The design month for an off-grid system is December: at 61° it makes 4.08 kWh per kWp a day, 11% more than at 45°, and costs 3% of the yearly total. Why steep panels win winter.
Off-grid solar in Arvayheer 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 | 2.00 | 5.12 | 4.93 | 4.37 | -17.2 °C |
| February snow | 3.13 | 6.01 | 5.71 | 5.35 | -14.1 °C |
| March snow | 4.50 | 6.46 | 5.95 | 5.97 | -5.8 °C |
| April | 5.90 | 5.39 | 4.82 | 5.76 | 2.7 °C |
| May | 6.81 | 4.81 | 4.19 | 5.52 | 8.8 °C |
| June | 6.79 | 4.29 | 3.64 | 5.00 | 15.2 °C |
| July | 6.39 | 4.23 | 3.55 | 4.79 | 17.8 °C |
| August | 5.81 | 4.69 | 3.99 | 4.99 | 15.5 °C |
| September | 4.92 | 5.55 | 4.85 | 5.40 | 8.8 °C |
| October snow | 3.47 | 5.81 | 5.24 | 5.14 | 0.5 °C |
| November snow | 2.19 | 5.20 | 4.84 | 4.36 | -8.2 °C |
| December snow | 1.61 | 4.37 | 4.18 | 3.67 | -15.4 °C |
| Year | 4.46 avg | 5.16 avg | 1698 kWh | 1833 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 320 Wp at 45°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Arvayheer
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 Arvayheer compares in Mongolia
Against the other 23 places in Mongolia with climate data, for a fixed array at its best angle.
6thof 24 places in Mongolia for sunshine: 4.47 peak sun hours a day on flat ground.
+4%solar energy a year compared with the average place in Mongolia: 1,833 against 1,757 kWh per kWp.
−14 mindaylight on the longest day, compared with Ulan Bator: 15 h 48 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); Arvayheer ranks 6th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 3.55 kWh a day here, against 3.47 kWh on average in Mongolia. The shortest day lasts 8 h 36 min, +13 min compared with Ulan Bator.
Solar forecast for Arvayheer, 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 Arvayheer: 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.