2026 has 68 son-eomneun days. January: 7, 8, 17, 18, 27, 28; February: 6, 7, 16, 25, 26; March: 7, 8, 17, 18, 27, 28; April: 6, 7, 16, 25, 26; May: 5, 6, 15, 16, 25, 26; June: 4, 5, 14, 23, 24; July: 3, 4, 13, 22, 23; August: 1, 2, 11, 12, 21, 22, 31; September: 1, 10, 19, 20, 29, 30; October: 9, 10, 19, 20, 29, 30; November: 8, 17, 18, 27, 28; December: 7, 8, 17, 18, 27, 28.
A day whose lunar date ends in 9 or 0. Said to be free of interfering spirits, and long the day people pick for moving house or opening a business. It has nothing to do with your birth chart.
Public holidays come from Korea Astronomy open data; the 24 solar terms are computed from solar longitude. Lunar dates and day pillars appear for every day.