P'yŏngan-bukto · North Korea · 40.39° N · 125.05° E
Solar position in Sakchu-ŭp
Sun position, daylight and the best solar panel angle for Sakchu-ŭp — computed for 40.39° N, 125.05° E, 138 m above sea level.
The sun right now
Sun in Sakchu-ŭp today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:29 | sun 18° below horizon |
| Nautical dawn | 06:01 | 12° below |
| Civil dawn | 06:33 | 6° below |
| Sunrise | 07:01 | 105° ESE |
| Golden hour ends | 07:38 | sun 6° up |
| Solar noon | 12:23 | 37.6° high |
| Golden hour starts | 17:08 | sun 6° up |
| Sunset | 17:46 | 255° WSW |
| Civil dusk | 18:14 | 6° below |
| Nautical dusk | 18:45 | 12° below |
| Astronomical dusk | 19:17 | 18° below |
| Day length | 10 h 45 min | |
Sun path diagram for Sakchu-ŭp
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 73.1° at solar noon in Sakchu-ŭp; on the December solstice only 26.2°. 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.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 07:58 | 12:51 | 17:44 | 9 h 46 min | 29.7° |
| February | 07:25 | 12:53 | 18:21 | 10 h 56 min | 39.1° |
| March | 06:42 | 12:47 | 18:52 | 12 h 10 min | 49.8° |
| April | 05:53 | 12:38 | 19:24 | 13 h 31 min | 61.5° |
| May | 05:18 | 12:36 | 19:54 | 14 h 36 min | 69.8° |
| June | 05:09 | 12:41 | 20:13 | 15 h 04 min | 73.1° |
| July | 05:26 | 12:46 | 20:05 | 14 h 38 min | 70.1° |
| August | 05:56 | 12:42 | 19:29 | 13 h 33 min | 61.7° |
| September | 06:25 | 12:32 | 18:39 | 12 h 13 min | 50.3° |
| October | 06:56 | 12:24 | 17:51 | 10 h 55 min | 39.0° |
| November | 07:32 | 12:25 | 17:18 | 9 h 46 min | 29.7° |
| December | 07:59 | 12:37 | 17:16 | 9 h 17 min | 26.2° |
A year of daylight in Sakchu-ŭp
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 Sakchu-ŭp
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: 1439 kWh per kWp.
34°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° | 1161 | 81% | 3.42 | 2.7× |
| 15° | 1327 | 92% | 3.47 | 1.9× |
| 30° | 1420 | 99% | 3.34 | 1.5× |
| 34° off-grid best | 1432 | 100% | 3.27 | 1.4× |
| 40° year-round best = latitude | 1439 | 100% | 3.16 | 1.5× |
| 45° | 1435 | 100% | 3.04 | 1.6× |
| 60° | 1372 | 95% | 2.60 | 1.8× |
| 70° | 1288 | 89% | 2.25 | 2.0× |
| 90° | 1036 | 72% | 1.46 | 2.9× |
A fixed array in Sakchu-ŭp produces the most over a year at 40°. The design month for an off-grid system is July: at 34° it makes 3.27 kWh per kWp a day, 4% more than at 40°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Sakchu-ŭp at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 40° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 40° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.39 | 4.71 | 4.42 | 3.95 | -10.2 °C |
| February snow | 3.10 | 4.82 | 4.46 | 4.25 | -6.5 °C |
| March snow | 4.24 | 4.92 | 4.45 | 4.78 | 0.0 °C |
| April | 4.93 | 4.03 | 3.53 | 4.48 | 7.3 °C |
| May | 5.52 | 3.61 | 3.06 | 4.33 | 14.4 °C |
| June | 5.04 | 3.06 | 2.52 | 3.69 | 19.6 °C |
| July | 4.28 | 2.76 | 2.25 | 3.16 | 22.6 °C |
| August | 4.43 | 3.27 | 2.69 | 3.55 | 22.4 °C |
| September | 4.34 | 4.19 | 3.54 | 4.17 | 17.3 °C |
| October | 3.32 | 4.37 | 3.81 | 3.98 | 9.7 °C |
| November | 2.29 | 3.98 | 3.59 | 3.42 | 0.8 °C |
| December snow | 2.02 | 4.39 | 4.09 | 3.58 | -8.0 °C |
| Year | 3.83 avg | 4.00 avg | 1288 kWh | 1439 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 520 Wp of panels at 70°, versus 370 Wp at 40°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Sakchu-ŭp
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.
5.1 mrow pitch at 70°
4.6 mrow pitch at 40°
How Sakchu-ŭp compares in North Korea
Against the other 96 places in North Korea with climate data, for a fixed array at its best angle.
65thof 97 places in North Korea for sunshine, shared: 3.83 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in North Korea: 1,439 against 1,424 kWh per kWp.
+9 mindaylight on the longest day, compared with Pyongyang: 15 h 04 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); Sakchu-ŭp ranks joint 65th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.25 kWh a day here, against 2.28 kWh on average in North Korea. The shortest day lasts 9 h 17 min, −8 min compared with Pyongyang.
Solar forecast for Sakchu-ŭp, 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 Sakchu-ŭp: 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.