South Pyongan · North Korea · 39.49° N · 125.47° E
Solar position in Sil-li
Sun position, daylight and the best solar panel angle for Sil-li — computed for 39.49° N, 125.47° E, 9 m above sea level.
The sun right now
Sun in Sil-li today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:28 | sun 18° below horizon |
| Nautical dawn | 05:59 | 12° below |
| Civil dawn | 06:30 | 6° below |
| Sunrise | 06:58 | 105° ESE |
| Golden hour ends | 07:35 | sun 6° up |
| Solar noon | 12:21 | 38.4° high |
| Golden hour starts | 17:08 | sun 6° up |
| Sunset | 17:45 | 255° WSW |
| Civil dusk | 18:13 | 6° below |
| Nautical dusk | 18:44 | 12° below |
| Astronomical dusk | 19:15 | 18° below |
| Day length | 10 h 48 min | |
Sun path diagram for Sil-li
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 73.9° at solar noon in Sil-li; on the December solstice only 27.1°. Sunrise swings from 58° ENE in June to 120° ESE in December — a 62° 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 | 07:54 | 12:49 | 17:44 | 9 h 51 min | 30.6° |
| February | 07:22 | 12:51 | 18:20 | 10 h 58 min | 39.9° |
| March | 06:40 | 12:45 | 18:50 | 12 h 10 min | 50.7° |
| April | 05:52 | 12:36 | 19:21 | 13 h 28 min | 62.4° |
| May | 05:19 | 12:34 | 19:50 | 14 h 31 min | 70.7° |
| June | 05:10 | 12:39 | 20:08 | 14 h 58 min | 73.9° |
| July | 05:27 | 12:44 | 20:00 | 14 h 33 min | 71.0° |
| August | 05:55 | 12:41 | 19:26 | 13 h 30 min | 62.6° |
| September | 06:24 | 12:31 | 18:37 | 12 h 13 min | 51.2° |
| October | 06:53 | 12:22 | 17:51 | 10 h 57 min | 39.8° |
| November | 07:28 | 12:23 | 17:19 | 9 h 51 min | 30.6° |
| December | 07:54 | 12:35 | 17:17 | 9 h 23 min | 27.1° |
A year of daylight in Sil-li
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 Sil-li
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
38°collects the most energy over a year: 1428 kWh per kWp.
36°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° | 1177 | 82% | 3.46 | 2.8× |
| 15° | 1333 | 93% | 3.49 | 2.0× |
| 30° | 1416 | 99% | 3.35 | 1.5× |
| 36° off-grid best | 1427 | 100% | 3.25 | 1.5× |
| 38° year-round best | 1428 | 100% | 3.21 | 1.5× |
| 39° = latitude | 1428 | 100% | 3.19 | 1.5× |
| 45° | 1420 | 99% | 3.05 | 1.6× |
| 60° | 1346 | 94% | 2.60 | 1.7× |
| 70° | 1255 | 88% | 2.23 | 1.9× |
| 90° | 993 | 70% | 1.43 | 2.8× |
A fixed array in Sil-li produces the most over a year at 38°. The design month for an off-grid system is July: at 36° it makes 3.25 kWh per kWp a day, 1% more than at 38°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Sil-li at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 38° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 38° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.31 | 4.34 | 4.02 | 3.58 | -6.6 °C |
| February snow | 3.08 | 4.71 | 4.31 | 4.09 | -3.6 °C |
| March | 4.32 | 4.71 | 4.22 | 4.73 | 1.9 °C |
| April | 5.09 | 4.10 | 3.57 | 4.61 | 8.6 °C |
| May | 5.64 | 3.61 | 3.05 | 4.44 | 15.5 °C |
| June | 5.28 | 3.13 | 2.57 | 3.87 | 20.8 °C |
| July | 4.34 | 2.75 | 2.23 | 3.21 | 23.6 °C |
| August | 4.51 | 3.29 | 2.69 | 3.61 | 23.8 °C |
| September | 4.40 | 4.16 | 3.48 | 4.15 | 19.2 °C |
| October | 3.46 | 4.44 | 3.83 | 4.02 | 12.2 °C |
| November | 2.36 | 3.94 | 3.51 | 3.34 | 3.8 °C |
| December snow | 2.01 | 4.17 | 3.83 | 3.33 | -4.3 °C |
| Year | 3.90 avg | 3.94 avg | 1255 kWh | 1428 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 530 Wp of panels at 70°, versus 370 Wp at 38°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Sil-li
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.
4.9 mrow pitch at 70°
4.4 mrow pitch at 38°
How Sil-li compares in North Korea
Against the other 96 places in North Korea with climate data, for a fixed array at its best angle.
3rdof 97 places in North Korea for sunshine, shared: 3.90 peak sun hours a day on flat ground.
±0%solar energy a year compared with the average place in North Korea: 1,428 against 1,424 kWh per kWp.
+3 mindaylight on the longest day, compared with Pyongyang: 14 h 58 min against 14 h 55 min.
38°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); Sil-li ranks joint 3rd. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.23 kWh a day here, against 2.28 kWh on average in North Korea. The shortest day lasts 9 h 23 min, −3 min compared with Pyongyang.
Solar forecast for Sil-li, 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 Sil-li
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Places near Sil-li
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A free, live card for Sil-li: 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.