Incheon · South Korea · 37.75° N · 126.49° E
Solar position in Ganghwa-gun
Sun position, daylight and the best solar panel angle for Ganghwa-gun — computed for 37.75° N, 126.49° E, 15 m above sea level.
The sun right now
Sun in Ganghwa-gun today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:23 | sun 18° below horizon |
| Nautical dawn | 05:54 | 12° below |
| Civil dawn | 06:24 | 6° below |
| Sunrise | 06:51 | 105° ESE |
| Golden hour ends | 07:27 | sun 6° up |
| Solar noon | 12:17 | 40.2° high |
| Golden hour starts | 17:07 | sun 6° up |
| Sunset | 17:44 | 255° WSW |
| Civil dusk | 18:10 | 6° below |
| Nautical dusk | 18:41 | 12° below |
| Astronomical dusk | 19:11 | 18° below |
| Day length | 10 h 52 min | |
Sun path diagram for Ganghwa-gun
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 Ganghwa-gun; on the December solstice only 28.8°. 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 | 07:45 | 12:45 | 17:44 | 9 h 59 min | 32.4° |
| February | 07:16 | 12:47 | 18:18 | 11 h 02 min | 41.7° |
| March | 06:36 | 12:41 | 18:46 | 12 h 10 min | 52.5° |
| April | 05:51 | 12:32 | 19:14 | 13 h 23 min | 64.1° |
| May | 05:20 | 12:30 | 19:41 | 14 h 22 min | 72.4° |
| June | 05:12 | 12:35 | 19:59 | 14 h 47 min | 75.7° |
| July | 05:28 | 12:40 | 19:52 | 14 h 24 min | 72.7° |
| August | 05:54 | 12:37 | 19:19 | 13 h 25 min | 64.4° |
| September | 06:20 | 12:27 | 18:33 | 12 h 13 min | 53.0° |
| October | 06:47 | 12:18 | 17:49 | 11 h 01 min | 41.6° |
| November | 07:20 | 12:19 | 17:19 | 9 h 59 min | 32.4° |
| December | 07:45 | 12:31 | 17:18 | 9 h 33 min | 28.8° |
A year of daylight in Ganghwa-gun
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 Ganghwa-gun
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
36°collects the most energy over a year: 1378 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° | 1170 | 85% | 3.32 | 2.6× |
| 15° | 1307 | 95% | 3.34 | 1.9× |
| 30° | 1373 | 100% | 3.19 | 1.5× |
| 36° year-round best off-grid best | 1378 | 100% | 3.09 | 1.5× |
| 38° = latitude | 1377 | 100% | 3.05 | 1.5× |
| 45° | 1363 | 99% | 2.89 | 1.6× |
| 60° | 1278 | 93% | 2.45 | 1.7× |
| 70° | 1183 | 86% | 2.10 | 1.9× |
| 90° | 919 | 67% | 1.34 | 2.7× |
A fixed array in Ganghwa-gun produces the most over a year at 36°. The design month for an off-grid system is July: at 36° it makes 3.09 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Ganghwa-gun at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 36° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 36° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.42 | 4.23 | 3.87 | 3.46 | -3.2 °C |
| February snow | 3.19 | 4.39 | 3.99 | 3.95 | -1.1 °C |
| March | 4.28 | 4.44 | 3.96 | 4.52 | 3.4 °C |
| April | 5.00 | 3.90 | 3.38 | 4.46 | 9.2 °C |
| May | 5.55 | 3.47 | 2.93 | 4.36 | 15.2 °C |
| June | 5.23 | 3.04 | 2.51 | 3.86 | 20.3 °C |
| July | 4.17 | 2.60 | 2.10 | 3.09 | 23.4 °C |
| August | 4.45 | 3.16 | 2.57 | 3.53 | 24.5 °C |
| September | 4.18 | 3.79 | 3.16 | 3.83 | 20.3 °C |
| October | 3.58 | 4.36 | 3.73 | 3.97 | 14.1 °C |
| November | 2.43 | 3.73 | 3.29 | 3.17 | 6.7 °C |
| December snow | 2.11 | 3.82 | 3.46 | 3.11 | -0.8 °C |
| Year | 3.89 avg | 3.74 avg | 1183 kWh | 1378 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 560 Wp of panels at 70°, versus 380 Wp at 36°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Ganghwa-gun
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 36°
How Ganghwa-gun compares in South Korea
Against the other 144 places in South Korea with climate data, for a fixed array at its best angle.
78thof 145 places in South Korea for sunshine, shared: 3.89 peak sun hours a day on flat ground.
+2%solar energy a year compared with the average place in South Korea: 1,378 against 1,356 kWh per kWp.
+1 mindaylight on the longest day, compared with Seoul: 14 h 47 min against 14 h 46 min.
36°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); Ganghwa-gun ranks joint 78th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.10 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 Ganghwa-gun, 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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Places near Ganghwa-gun
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A free, live card for Ganghwa-gun: 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.