Chungcheongnam-do · South Korea · 36.81° N · 127.15° E
Solar position in Cheonan
Sun position, daylight and the best solar panel angle for Cheonan — computed for 36.81° N, 127.15° E, 40 m above sea level.
The sun right now
Sun in Cheonan today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:20 | sun 18° below horizon |
| Nautical dawn | 05:51 | 12° below |
| Civil dawn | 06:21 | 6° below |
| Sunrise | 06:47 | 104° ESE |
| Golden hour ends | 07:23 | sun 6° up |
| Solar noon | 12:15 | 41.1° high |
| Golden hour starts | 17:06 | sun 6° up |
| Sunset | 17:42 | 255° WSW |
| Civil dusk | 18:09 | 6° below |
| Nautical dusk | 18:39 | 12° below |
| Astronomical dusk | 19:09 | 18° below |
| Day length | 10 h 55 min | |
Sun path diagram for Cheonan
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 76.6° at solar noon in Cheonan; on the December solstice only 29.8°. 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 | 07:41 | 12:42 | 17:44 | 10 h 03 min | 33.3° |
| February | 07:13 | 12:45 | 18:17 | 11 h 04 min | 42.6° |
| March | 06:34 | 12:38 | 18:43 | 12 h 09 min | 53.4° |
| April | 05:50 | 12:30 | 19:10 | 13 h 21 min | 65.0° |
| May | 05:19 | 12:28 | 19:36 | 14 h 17 min | 73.4° |
| June | 05:12 | 12:33 | 19:53 | 14 h 41 min | 76.6° |
| July | 05:28 | 12:37 | 19:47 | 14 h 19 min | 73.7° |
| August | 05:53 | 12:34 | 19:15 | 13 h 22 min | 65.3° |
| September | 06:18 | 12:24 | 18:30 | 12 h 12 min | 53.9° |
| October | 06:44 | 12:15 | 17:47 | 11 h 04 min | 42.5° |
| November | 07:15 | 12:17 | 17:18 | 10 h 04 min | 33.3° |
| December | 07:40 | 12:29 | 17:18 | 9 h 38 min | 29.8° |
A year of daylight in Cheonan
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 Cheonan
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
35°collects the most energy over a year: 1360 kWh per kWp.
35°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° | 1165 | 86% | 3.32 | 2.6× |
| 15° | 1296 | 95% | 3.33 | 1.9× |
| 30° | 1356 | 100% | 3.18 | 1.5× |
| 35° year-round best off-grid best | 1360 | 100% | 3.09 | 1.4× |
| 37° = latitude | 1359 | 100% | 3.06 | 1.4× |
| 45° | 1343 | 99% | 2.87 | 1.5× |
| 60° | 1257 | 92% | 2.43 | 1.7× |
| 70° | 1162 | 85% | 2.09 | 1.9× |
| 90° | 899 | 66% | 1.33 | 2.7× |
A fixed array in Cheonan produces the most over a year at 35°. The design month for an off-grid system is July: at 35° 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 Cheonan at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 35° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 35° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.41 | 4.17 | 3.82 | 3.39 | -3.1 °C |
| February snow | 3.20 | 4.32 | 3.91 | 3.89 | -0.8 °C |
| March | 4.25 | 4.31 | 3.83 | 4.42 | 3.8 °C |
| April | 4.98 | 3.82 | 3.31 | 4.41 | 9.9 °C |
| May | 5.55 | 3.43 | 2.89 | 4.35 | 15.9 °C |
| June | 5.14 | 2.98 | 2.45 | 3.80 | 20.9 °C |
| July | 4.18 | 2.58 | 2.09 | 3.09 | 23.9 °C |
| August | 4.40 | 3.08 | 2.50 | 3.47 | 24.7 °C |
| September | 4.07 | 3.60 | 3.00 | 3.68 | 19.9 °C |
| October | 3.57 | 4.24 | 3.64 | 3.90 | 13.5 °C |
| November | 2.50 | 3.77 | 3.32 | 3.21 | 6.3 °C |
| December snow | 2.15 | 3.83 | 3.48 | 3.12 | -0.9 °C |
| Year | 3.87 avg | 3.67 avg | 1162 kWh | 1360 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 570 Wp of panels at 70°, versus 380 Wp at 35°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Cheonan
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.
4.4 mrow pitch at 70°
3.9 mrow pitch at 35°
How Cheonan compares in South Korea
Against the other 144 places in South Korea with climate data, for a fixed array at its best angle.
92ndof 145 places in South Korea for sunshine, shared: 3.87 peak sun hours a day on flat ground.
±0%solar energy a year compared with the average place in South Korea: 1,360 against 1,356 kWh per kWp.
−5 mindaylight on the longest day, compared with Seoul: 14 h 41 min against 14 h 46 min.
35°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); Cheonan ranks joint 92nd. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.09 kWh a day here, against 2.12 kWh on average in South Korea. The shortest day lasts 9 h 38 min, +4 min compared with Seoul.
Solar forecast for Cheonan, 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 Cheonan
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Places near Cheonan
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A free, live card for Cheonan: 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.