Solarposition.org

South Hamgyong · North Korea · 40.61° N · 128.78° E

Solar position in Changam-ch’on

Sun position, daylight and the best solar panel angle for Changam-ch’on — computed for 40.61° N, 128.78° E, 141 m above sea level.

Sunrise today06:46105° ESE
Sunset today17:30255° WSW
Best panel angle40°year-round, facing south
Off-grid angle41°best for the darkest month

The sun right now

Azimuth180.0°
Elevation37.3°
At solar noon, 12:08Open on the sun map

Sun in Changam-ch’on today

Sunday, 25 October 2026 · local time UTC+9

EventTimeDirection / height
Astronomical dawn05:14sun 18° below horizon
Nautical dawn05:4612° below
Civil dawn06:186° below
Sunrise06:46105° ESE
Golden hour ends07:24sun 6° up
Solar noon12:0837.3° high
Golden hour starts16:53sun 6° up
Sunset17:30255° WSW
Civil dusk17:586° below
Nautical dusk18:3012° below
Astronomical dusk19:0218° below
Day length10 h 45 min

Sun path diagram for Changam-ch’on

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 solstice678910111213141516171819EquinoxDecember solstice8910111213141516Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 72.8° at solar noon in Changam-ch’on; on the December solstice only 26.0°. Sunrise swings from 58° ENE in June to 121° ESE in December — a 63° 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
January07:4312:3617:289 h 45 min29.5°
February07:1112:3818:0610 h 55 min38.8°
March06:2712:3218:3712 h 10 min49.6°
April05:3812:2319:0913 h 32 min61.2°
May05:0312:2119:4014 h 37 min69.6°
June04:5412:2619:5915 h 05 min72.8°
July05:1112:3119:5014 h 39 min69.9°
August05:4012:2719:1413 h 34 min61.5°
September06:1012:1718:2412 h 14 min50.1°
October06:4112:0917:3610 h 55 min38.7°
November07:1712:1017:039 h 45 min29.5°
December07:4412:2217:009 h 16 min26.0°

A year of daylight in Changam-ch’on

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 Changam-ch’on

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

40°collects the most energy over a year: 1451 kWh per kWp.

41°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 40°Best worst-month 41°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°118081%1.662.7×
15°134493%2.422.0×
30°143599%3.061.6×
40° year-round best1451100%3.391.4×
41° off-grid best = latitude1451100%3.421.4×
45°1446100%3.521.5×
60°137995%3.801.7×
70°129389%3.861.9×
90°103771%3.692.7×

A fixed array in Changam-ch’on produces the most over a year at 40°. The design month for an off-grid system is December: at 41° it makes 3.42 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.

Off-grid solar in Changam-ch’on at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 40° (year-round best).

0123456January: 4.04 (70°)4.0JanFebruary: 4.52 (70°)4.5FebMarch: 4.55 (70°)4.6MarApril: 3.71 (70°)3.7AprMay: 3.06 (70°)3.1MayJune: 2.61 (70°)2.6JunJuly: 2.42 (70°)2.4JulAugust: 2.78 (70°)2.8AugSeptember: 3.46 (70°)3.5SepOctober: 3.94 (70°)3.9OctNovember: 3.63 (70°)3.6NovDecember: 3.86 (70°)3.9Dec40°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 40°Mean temp.
January snow2.254.374.043.62-6.4 °C
February snow3.144.924.524.30-4.6 °C
March snow4.335.044.554.890.2 °C
April5.154.223.714.716.4 °C
May5.423.583.064.3012.5 °C
June5.133.132.613.8017.2 °C
July4.612.942.423.4420.4 °C
August4.543.362.783.6721.2 °C
September4.234.093.464.0716.8 °C
October3.424.543.944.1110.8 °C
November2.364.063.633.472.9 °C
December snow1.994.203.863.39-4.4 °C
Year3.88 avg4.03 avg1293 kWh1451 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 490 Wp of panels at 70°, versus 350 Wp at 40°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Changam-ch’on

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.

5.2 mrow pitch at 70°

4.6 mrow pitch at 40°

Row spacing calculator

How Changam-ch’on compares in North Korea

Against the other 96 places in North Korea with climate data, for a fixed array at its best angle.

22ndof 97 places in North Korea for sunshine, shared: 3.88 peak sun hours a day on flat ground.

+2%solar energy a year compared with the average place in North Korea: 1,451 against 1,424 kWh per kWp.

+10 mindaylight on the longest day, compared with Pyongyang: 15 h 05 min against 14 h 55 min.

40°best year-round tilt here; across North Korea it runs from 34° in Ongjin to 44° in Namyang-nodongjagu.

Of the 97 places in North Korea, Sinp’o and one other place get the most sun (3.91 peak sun hours a day) and Ŏrang and one other place the least (3.70); Changam-ch’on ranks joint 22nd. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.42 kWh a day here, against 2.28 kWh on average in North Korea. The shortest day lasts 9 h 16 min, −10 min compared with Pyongyang.

The sunniest places in North Korea

Solar forecast for Changam-ch’on, 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 Changam-ch’on

What is the best solar panel angle in Changam-ch’on?
For a fixed array facing south, the best year-round tilt in Changam-ch’on is 40°, worth about 1451 kWh per kWp a year. An off-grid system that has to get through December does better at about 41°.
What time is sunrise and sunset in Changam-ch’on today?
On 25 October 2026 the sun rises at 06:46 and sets at 17:30 local time (UTC+9), giving 10 h 45 min of daylight. Solar noon is at 12:08.
How many peak sun hours does Changam-ch’on get?
On a flat surface 3.9 hours a day averaged over the year, from 2.0 in December to 5.4 in May. Panels tilted at 70° receive 2.9 sun hours a day in July.
How high does the sun get in Changam-ch’on?
At solar noon the sun stands 72.8° above the horizon on the June solstice and 26.0° on the December solstice.
Is Changam-ch’on a good place for solar panels?
With 3.9 peak sun hours a day on flat ground, Changam-ch’on ranks joint 22nd of 97 places in North Korea for sunshine. A 1 kWp array at the best angle (40°) makes about 1,451 kWh a year here, 2% more than the average place in North Korea.

Places near Changam-ch’on

All places in North Korea

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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.