Solarposition.org

Quang Tri · Vietnam · 17.47° N · 106.62° E

Solar position in Đồng Hới

Sun position, daylight and the best solar panel angle for Đồng Hới — computed for 17.47° N, 106.62° E, 9 m above sea level.

Sunrise today05:49102° ESE
Sunset today17:25257° WSW
Best panel angle11°year-round, facing south
Off-grid angle39°best for the darkest month

The sun right now

Azimuth180.0°
Elevation60.4°
At solar noon, 11:37Open on the sun map

Sun in Đồng Hới today

Sunday, 25 October 2026 · local time UTC+7

EventTimeDirection / height
Astronomical dawn04:36sun 18° below horizon
Nautical dawn05:0112° below
Civil dawn05:276° below
Sunrise05:49102° ESE
Golden hour ends06:18sun 6° up
Solar noon11:3760.4° high
Golden hour starts16:56sun 6° up
Sunset17:25257° WSW
Civil dusk17:476° below
Nautical dusk18:1312° below
Astronomical dusk18:3818° below
Day length11 h 36 min

Sun path diagram for Đồng Hới

Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.

15°30°45°60°75°N30°60°E120°150°S210°240°W300°330°June solstice6789101112131415161718EquinoxDecember solstice7891011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 84.0° at solar noon in Đồng Hới; on the December solstice only 49.1°. Sunrise swings from 65° ENE in June to 114° ESE in December — a 49° 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.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January06:2712:0417:4211 h 15 min52.6°
February06:1712:0717:5711 h 40 min62.0°
March05:5712:0018:0412 h 07 min72.8°
April05:3311:5218:1112 h 37 min84.4°
May05:1911:5018:2013 h 01 min87.3°
June05:2011:5518:3013 h 11 min84.0°
July05:2911:5918:3013 h 01 min87.0°
August05:3711:5618:1512 h 38 min84.6°
September05:4211:4617:5012 h 09 min73.2°
October05:4811:3817:2711 h 40 min61.8°
November06:0111:3917:1611 h 15 min52.6°
December06:1811:5117:2411 h 05 min49.1°

A year of daylight in Đồng Hới

Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.

00:0003:0006:0009:0012:0015:0018:0021:0000:00JanFebMarAprMayJunJulAugSepOctNovDec

Best solar panel angle in Đồng Hới

Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.

11°collects the most energy over a year: 1191 kWh per kWp.

39°gives the most in the darkest month — the one an off-grid system is sized for.

40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 11°Best worst-month 39°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°117398%1.812.4×
11° year-round best1191100%1.992.1×
15°1189100%2.052.0×
17° = latitude1187100%2.072.0×
30°114296%2.171.7×
39° off-grid best108591%2.201.5×
45°103587%2.181.4×
60°87774%2.081.3×
70°75063%1.941.6×
90°50943%1.541.7×

A fixed array in Đồng Hới produces the most over a year at 11°. The design month for an off-grid system is December: at 39° it makes 2.20 kWh per kWp a day, 10% more than at 11°, and costs 9% of the yearly total. Why steep panels win winter.

Off-grid solar in Đồng Hới at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 11° (year-round best).

012345January: 2.23 (70°)2.2JanFebruary: 2.47 (70°)2.5FebMarch: 2.24 (70°)2.2MarApril: 2.08 (70°)2.1AprMay: 1.78 (70°)1.8MayJune: 1.58 (70°)1.6JunJuly: 1.59 (70°)1.6JulAugust: 1.90 (70°)1.9AugSeptember: 2.26 (70°)2.3SepOctober: 2.29 (70°)2.3OctNovember: 2.33 (70°)2.3NovDecember: 1.94 (70°)1.9Dec11°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 11°Mean temp.
January2.662.692.232.3320.0 °C
February3.422.992.472.9420.9 °C
March3.862.742.243.1922.9 °C
April4.742.582.083.7725.6 °C
May5.462.251.784.2027.4 °C
June5.412.011.584.1028.1 °C
July5.142.021.593.9227.9 °C
August4.822.381.903.7527.7 °C
September4.382.812.263.5227.1 °C
October3.532.822.292.9325.5 °C
November2.932.842.332.5223.6 °C
December2.292.361.941.9920.9 °C
Year4.05 avg2.54 avg750 kWh1191 kWh

Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 740 Wp of panels at 70°, versus 590 Wp at 11°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Đồng Hới

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.

2.5 mrow pitch at 70°

2.3 mrow pitch at 11°

Row spacing calculator

How Đồng Hới compares in Vietnam

Against the other 306 places in Vietnam with climate data, for a fixed array at its best angle.

172ndof 307 places in Vietnam for sunshine: 4.05 peak sun hours a day on flat ground.

−10%solar energy a year compared with the average place in Vietnam: 1,191 against 1,320 kWh per kWp.

+25 mindaylight on the longest day, compared with Ho Chi Minh City: 13 h 11 min against 12 h 46 min.

11°best year-round tilt here; across Vietnam it runs from 9° in Vĩnh Châu to 21° in Dien Bien Phu.

Of the 307 places in Vietnam, Phú Quý gets the most sun (5.45 peak sun hours a day) and Thị Trấn Thất Khê and one other place the least (3.61); Đồng Hới ranks 172nd. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.58 kWh a day here, against 1.53 kWh on average in Vietnam. The shortest day lasts 11 h 05 min, −24 min compared with Ho Chi Minh City.

The sunniest places in Vietnam

Solar forecast for Đồng Hới, next 48 hours

Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.

Loading the latest forecast…

Questions about the sun in Đồng Hới

What is the best solar panel angle in Đồng Hới?
For a fixed array facing south, the best year-round tilt in Đồng Hới is 11°, worth about 1191 kWh per kWp a year. An off-grid system that has to get through December does better at about 39°.
What time is sunrise and sunset in Đồng Hới today?
On 25 October 2026 the sun rises at 05:49 and sets at 17:25 local time (UTC+7), giving 11 h 36 min of daylight. Solar noon is at 11:37.
How many peak sun hours does Đồng Hới get?
On a flat surface 4.1 hours a day averaged over the year, from 2.3 in December to 5.5 in May. Panels tilted at 70° receive 2.0 sun hours a day in June.
How high does the sun get in Đồng Hới?
At solar noon the sun stands 84.0° above the horizon on the June solstice and 49.1° on the December solstice.
Is Đồng Hới a good place for solar panels?
With 4.1 peak sun hours a day on flat ground, Đồng Hới ranks 172nd of 307 places in Vietnam for sunshine. A 1 kWp array at the best angle (11°) makes about 1,191 kWh a year here, 10% less than the average place in Vietnam.

Places near Đồng Hới

All places in Vietnam

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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.