July 21, 2026 · Cheonan, South Korea
Sunset in Cheonan today is at 19:48. Day length is 14h 20m. See below for sunrise, solar noon, dawn and dusk — all times calculated astronomically for Cheonan's coordinates and updated daily.
Cheonan lies at 37°N. At this latitude, day length varies moderately — from around 10 hours in midwinter to 14–15 hours in midsummer.
Sunset shifts later through spring and earlier through autumn — changing fastest near the equinoxes and slowest near the summer and winter solstices. See the year chart to visualise how sunset times shift month by month for Cheonan.
The longest day in Cheonan is around 14h 41m (around June 21). The shortest is around 9h 38m (around December 21). Days are currently getting shorter — losing about 1 minute per day.
| Month | Sunset | Sunrise | Day length |
|---|---|---|---|
| January | 17:38 | 07:44 | 9h 54m |
| February | 18:12 | 07:21 | 10h 50m |
| March | 18:39 | 06:44 | 11h 54m |
| April | 19:05 | 05:59 | 13h 7m |
| May | 19:32 | 05:25 | 14h 7m |
| June | 19:53 | 05:13 | 14h 40m |
| July | 19:52 | 05:24 | 14h 27m |
| August | 19:25 | 05:49 | 13h 36m |
| September | 18:42 | 06:14 | 12h 28m |
| October | 17:57 | 06:39 | 11h 18m |
| November | 17:24 | 07:10 | 10h 14m |
| December | 17:17 | 07:37 | 9h 40m |