Gangwon-do · South Korea · 37.69° N · 127.89° E
Solar position in Hongch’ŏn
Sun position, daylight and the best solar panel angle for Hongch’ŏn — computed for 37.69° N, 127.89° E, 137 m above sea level.
The sun right now
Sun in Hongch’ŏn today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:18 | sun 18° below horizon |
| Nautical dawn | 05:48 | 12° below |
| Civil dawn | 06:19 | 6° below |
| Sunrise | 06:46 | 105° ESE |
| Golden hour ends | 07:22 | sun 6° up |
| Solar noon | 12:12 | 40.3° high |
| Golden hour starts | 17:02 | sun 6° up |
| Sunset | 17:38 | 255° WSW |
| Civil dusk | 18:05 | 6° below |
| Nautical dusk | 18:36 | 12° below |
| Astronomical dusk | 19:06 | 18° below |
| Day length | 10 h 53 min | |
Sun path diagram for Hongch’ŏn
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 75.7° at solar noon in Hongch’ŏn; on the December solstice only 28.9°. Sunrise swings from 59° ENE in June to 119° ESE in December — a 60° 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 | 07:40 | 12:39 | 17:39 | 9 h 59 min | 32.4° |
| February | 07:11 | 12:42 | 18:13 | 11 h 02 min | 41.7° |
| March | 06:31 | 12:35 | 18:40 | 12 h 10 min | 52.5° |
| April | 05:45 | 12:27 | 19:09 | 13 h 23 min | 64.2° |
| May | 05:14 | 12:25 | 19:35 | 14 h 21 min | 72.5° |
| June | 05:06 | 12:30 | 19:53 | 14 h 46 min | 75.7° |
| July | 05:22 | 12:34 | 19:46 | 14 h 24 min | 72.8° |
| August | 05:48 | 12:31 | 19:13 | 13 h 25 min | 64.4° |
| September | 06:15 | 12:21 | 18:27 | 12 h 13 min | 53.0° |
| October | 06:42 | 12:12 | 17:43 | 11 h 02 min | 41.7° |
| November | 07:14 | 12:14 | 17:13 | 9 h 59 min | 32.4° |
| December | 07:39 | 12:26 | 17:13 | 9 h 33 min | 28.9° |
A year of daylight in Hongch’ŏn
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 Hongch’ŏn
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
37°collects the most energy over a year: 1368 kWh per kWp.
28°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° | 1150 | 84% | 3.21 | 2.5× |
| 15° | 1290 | 94% | 3.23 | 1.8× |
| 28° off-grid best | 1355 | 99% | 3.11 | 1.4× |
| 30° | 1360 | 99% | 3.08 | 1.4× |
| 37° year-round best | 1368 | 100% | 2.97 | 1.5× |
| 38° = latitude | 1368 | 100% | 2.95 | 1.5× |
| 45° | 1357 | 99% | 2.79 | 1.5× |
| 60° | 1281 | 94% | 2.38 | 1.8× |
| 70° | 1193 | 87% | 2.04 | 2.1× |
| 90° | 941 | 69% | 1.32 | 2.9× |
A fixed array in Hongch’ŏn produces the most over a year at 37°. The design month for an off-grid system is July: at 28° it makes 3.11 kWh per kWp a day, 5% more than at 37°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Hongch’ŏn at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 37° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 37° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.43 | 4.37 | 4.04 | 3.61 | -5.7 °C |
| February snow | 3.19 | 4.64 | 4.23 | 4.06 | -2.8 °C |
| March | 4.14 | 4.24 | 3.79 | 4.34 | 2.4 °C |
| April | 4.90 | 3.81 | 3.31 | 4.35 | 8.7 °C |
| May | 5.50 | 3.45 | 2.92 | 4.30 | 15.2 °C |
| June | 5.17 | 3.02 | 2.49 | 3.80 | 20.0 °C |
| July | 4.03 | 2.52 | 2.04 | 2.97 | 23.0 °C |
| August | 4.19 | 2.98 | 2.43 | 3.31 | 23.4 °C |
| September | 3.95 | 3.54 | 2.97 | 3.60 | 18.3 °C |
| October | 3.49 | 4.24 | 3.66 | 3.91 | 11.7 °C |
| November | 2.46 | 3.87 | 3.45 | 3.33 | 4.1 °C |
| December snow | 2.18 | 4.29 | 3.93 | 3.43 | -3.6 °C |
| Year | 3.80 avg | 3.74 avg | 1193 kWh | 1368 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 580 Wp of panels at 70°, versus 400 Wp at 37°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Hongch’ŏn
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.
4.6 mrow pitch at 70°
4.1 mrow pitch at 37°
How Hongch’ŏn compares in South Korea
Against the other 144 places in South Korea with climate data, for a fixed array at its best angle.
135thof 145 places in South Korea for sunshine, shared: 3.80 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in South Korea: 1,368 against 1,356 kWh per kWp.
+1 mindaylight on the longest day, compared with Seoul: 14 h 46 min against 14 h 46 min.
37°best year-round tilt here; across South Korea it runs from 27° in Seogwipo to 37° in Uijeongbu-si.
Of the 145 places in South Korea, Tongyeong gets the most sun (4.04 peak sun hours a day) and Kosong the least (3.76); Hongch’ŏn ranks joint 135th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.04 kWh a day here, against 2.12 kWh on average in South Korea. The shortest day lasts 9 h 33 min, −1 min compared with Seoul.
Solar forecast for Hongch’ŏn, 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 Hongch’ŏn
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Places near Hongch’ŏn
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A free, live card for Hongch’ŏn: 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.