Oudômxai · Laos · 20.69° N · 101.98° E
Solar position in Muang Xay
Sun position, daylight and the best solar panel angle for Muang Xay — computed for 20.69° N, 101.98° E, 652 m above sea level.
The sun right now
Sun in Muang Xay today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:56 | sun 18° below horizon |
| Nautical dawn | 05:22 | 12° below |
| Civil dawn | 05:48 | 6° below |
| Sunrise | 06:11 | 103° ESE |
| Golden hour ends | 06:41 | sun 6° up |
| Solar noon | 11:56 | 57.2° high |
| Golden hour starts | 17:10 | sun 6° up |
| Sunset | 17:41 | 257° WSW |
| Civil dusk | 18:03 | 6° below |
| Nautical dusk | 18:29 | 12° below |
| Astronomical dusk | 18:55 | 18° below |
| Day length | 11 h 30 min | |
Sun path diagram for Muang Xay
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 87.3° at solar noon in Muang Xay; on the December solstice only 45.9°. Sunrise swings from 64° ENE in June to 115° ESE in December — a 50° 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 | 06:50 | 12:23 | 17:55 | 11 h 05 min | 49.4° |
| February | 06:38 | 12:25 | 18:13 | 11 h 35 min | 58.8° |
| March | 06:15 | 12:19 | 18:23 | 12 h 08 min | 69.6° |
| April | 05:49 | 12:10 | 18:32 | 12 h 44 min | 81.2° |
| May | 05:32 | 12:08 | 18:44 | 13 h 12 min | 89.5° |
| June | 05:32 | 12:13 | 18:55 | 13 h 23 min | 87.3° |
| July | 05:42 | 12:18 | 18:54 | 13 h 13 min | 89.8° |
| August | 05:52 | 12:15 | 18:37 | 12 h 44 min | 81.4° |
| September | 06:00 | 12:05 | 18:09 | 12 h 09 min | 70.0° |
| October | 06:09 | 11:56 | 17:43 | 11 h 34 min | 58.6° |
| November | 06:25 | 11:57 | 17:30 | 11 h 05 min | 49.4° |
| December | 06:43 | 12:09 | 17:36 | 10 h 53 min | 45.9° |
A year of daylight in Muang Xay
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 Muang Xay
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
22°collects the most energy over a year: 1415 kWh per kWp.
7°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 | July kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1334 | 94% | 3.33 | 1.5× |
| 7° off-grid best | 1377 | 97% | 3.29 | 1.3× |
| 15° | 1407 | 99% | 3.22 | 1.4× |
| 21° = latitude | 1415 | 100% | 3.14 | 1.5× |
| 22° year-round best | 1415 | 100% | 3.12 | 1.5× |
| 30° | 1404 | 99% | 2.97 | 1.6× |
| 45° | 1328 | 94% | 2.59 | 1.8× |
| 60° | 1184 | 84% | 2.10 | 2.0× |
| 70° | 1054 | 75% | 1.75 | 2.3× |
| 90° | 756 | 53% | 1.20 | 2.6× |
A fixed array in Muang Xay produces the most over a year at 22°. The design month for an off-grid system is July: at 7° it makes 3.29 kWh per kWp a day, 6% more than at 22°, and costs 3% of the yearly total. Why steep panels win winter.
Off-grid solar in Muang Xay at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 22° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 22° | Mean temp. |
|---|---|---|---|---|---|
| January | 3.97 | 4.64 | 3.92 | 4.01 | 17.5 °C |
| February | 4.86 | 4.74 | 3.97 | 4.56 | 20.2 °C |
| March | 5.09 | 3.83 | 3.16 | 4.32 | 23.1 °C |
| April | 5.54 | 3.19 | 2.59 | 4.34 | 25.5 °C |
| May | 5.34 | 2.59 | 2.08 | 3.98 | 26.0 °C |
| June | 4.60 | 2.31 | 1.85 | 3.39 | 25.6 °C |
| July | 4.19 | 2.18 | 1.75 | 3.12 | 24.6 °C |
| August | 4.33 | 2.51 | 2.03 | 3.32 | 24.3 °C |
| September | 4.62 | 3.15 | 2.57 | 3.75 | 24.1 °C |
| October | 4.38 | 3.72 | 3.07 | 3.84 | 22.8 °C |
| November | 4.20 | 4.68 | 3.92 | 4.13 | 20.1 °C |
| December | 3.73 | 4.53 | 3.84 | 3.82 | 17.2 °C |
| Year | 4.57 avg | 3.50 avg | 1054 kWh | 1415 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 670 Wp of panels at 70°, versus 380 Wp at 22°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Muang Xay
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.
2.7 mrow pitch at 70°
2.7 mrow pitch at 22°
How Muang Xay compares in Laos
Against the other 17 places in Laos with climate data, for a fixed array at its best angle.
16thof 18 places in Laos for sunshine: 4.57 peak sun hours a day on flat ground.
−2%solar energy a year compared with the average place in Laos: 1,415 against 1,448 kWh per kWp.
+11 mindaylight on the longest day, compared with Vientiane: 13 h 23 min against 13 h 12 min.
22°best year-round tilt here; across Laos it runs from 18° in Pakse to 23° in Ban Khoan.
Of the 18 places in Laos, Pakse gets the most sun (5.00 peak sun hours a day) and Xam Nua the least (4.19); Muang Xay ranks 16th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 1.75 kWh a day here, against 1.63 kWh on average in Laos. The shortest day lasts 10 h 53 min, −11 min compared with Vientiane.
Solar forecast for Muang Xay, 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 Muang Xay
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Places near Muang Xay
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A free, live card for Muang Xay: 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.