Gyeonggi-do · South Korea · 37.28° N · 127.44° E
Solar position in Icheon-si
Sun position, daylight and the best solar panel angle for Icheon-si — computed for 37.28° N, 127.44° E, 68 m above sea level.
The sun right now
Sun in Icheon-si today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:19 | sun 18° below horizon |
| Nautical dawn | 05:50 | 12° below |
| Civil dawn | 06:20 | 6° below |
| Sunrise | 06:47 | 104° ESE |
| Golden hour ends | 07:23 | sun 6° up |
| Solar noon | 12:14 | 40.7° high |
| Golden hour starts | 17:04 | sun 6° up |
| Sunset | 17:40 | 255° WSW |
| Civil dusk | 18:07 | 6° below |
| Nautical dusk | 18:38 | 12° below |
| Astronomical dusk | 19:08 | 18° below |
| Day length | 10 h 54 min | |
Sun path diagram for Icheon-si
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 76.2° at solar noon in Icheon-si; on the December solstice only 29.3°. 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 | 12:41 | 17:42 | 10 h 01 min | 32.8° |
| February | 07:12 | 12:44 | 18:15 | 11 h 03 min | 42.2° |
| March | 06:33 | 12:37 | 18:42 | 12 h 09 min | 52.9° |
| April | 05:48 | 12:29 | 19:10 | 13 h 22 min | 64.6° |
| May | 05:17 | 12:26 | 19:36 | 14 h 19 min | 72.9° |
| June | 05:09 | 12:31 | 19:53 | 14 h 44 min | 76.2° |
| July | 05:25 | 12:36 | 19:47 | 14 h 21 min | 73.2° |
| August | 05:51 | 12:33 | 19:15 | 13 h 24 min | 64.9° |
| September | 06:16 | 12:23 | 18:29 | 12 h 13 min | 53.5° |
| October | 06:43 | 12:14 | 17:45 | 11 h 03 min | 42.1° |
| November | 07:15 | 12:15 | 17:16 | 10 h 01 min | 32.9° |
| December | 07:40 | 12:28 | 17:15 | 9 h 36 min | 29.3° |
A year of daylight in Icheon-si
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 Icheon-si
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: 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° | 1155 | 84% | 3.20 | 2.5× |
| 15° | 1293 | 95% | 3.21 | 1.8× |
| 28° off-grid best | 1357 | 99% | 3.10 | 1.4× |
| 30° | 1361 | 100% | 3.07 | 1.5× |
| 36° year-round best | 1368 | 100% | 2.97 | 1.5× |
| 37° = latitude | 1368 | 100% | 2.95 | 1.5× |
| 45° | 1355 | 99% | 2.78 | 1.6× |
| 60° | 1276 | 93% | 2.36 | 1.7× |
| 70° | 1185 | 87% | 2.03 | 2.0× |
| 90° | 928 | 68% | 1.31 | 2.9× |
A fixed array in Icheon-si produces the most over a year at 36°. The design month for an off-grid system is July: at 28° it makes 3.10 kWh per kWp a day, 4% more than at 36°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Icheon-si 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 | 2.45 | 4.40 | 4.05 | 3.60 | -5.0 °C |
| February snow | 3.20 | 4.39 | 4.00 | 3.97 | -2.0 °C |
| March | 4.18 | 4.26 | 3.80 | 4.37 | 3.1 °C |
| April | 4.91 | 3.79 | 3.29 | 4.35 | 9.6 °C |
| May | 5.52 | 3.43 | 2.89 | 4.31 | 15.9 °C |
| June | 5.16 | 3.00 | 2.47 | 3.79 | 20.9 °C |
| July | 4.02 | 2.51 | 2.03 | 2.97 | 23.8 °C |
| August | 4.26 | 3.01 | 2.45 | 3.36 | 24.3 °C |
| September | 4.01 | 3.58 | 2.99 | 3.65 | 19.2 °C |
| October | 3.55 | 4.27 | 3.68 | 3.93 | 12.4 °C |
| November | 2.49 | 3.87 | 3.44 | 3.31 | 4.8 °C |
| December snow | 2.19 | 4.28 | 3.91 | 3.39 | -2.9 °C |
| Year | 3.83 avg | 3.73 avg | 1185 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 36°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Icheon-si
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.
4.5 mrow pitch at 70°
4.0 mrow pitch at 36°
How Icheon-si compares in South Korea
Against the other 144 places in South Korea with climate data, for a fixed array at its best angle.
119thof 145 places in South 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 South Korea: 1,368 against 1,356 kWh per kWp.
−2 mindaylight on the longest day, compared with Seoul: 14 h 44 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); Icheon-si ranks joint 119th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.03 kWh a day here, against 2.12 kWh on average in South Korea. The shortest day lasts 9 h 36 min, +2 min compared with Seoul.
Solar forecast for Icheon-si, 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 Icheon-si
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Places near Icheon-si
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A free, live card for Icheon-si: 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.