Korean New Year (Hangul: 설날; RR: Seollal; MR: Sŏllal, also known as: Sesu (세수; 歲首), Wondan (원단; 元旦), Wonil (원일; 元日), Sinwon (신원;新元)) is the first day of the Korean lunar calendar. It is one of the most significant traditional Korean holidays. The celebration lasts three days: the day before Korean New Year day, Korean New Year day itself, and the day after Korean New Year day. "Seollal" generally refers to Eumnyeok Seollal (음력 설날, lunar new year), also known as Gujeong (Hangul: 구정; hanja: 舊正). "Seollal" may also refer to Yangnyeok Seollal (양력 설날, solar new year), also known as Sinjeong (Hangul: 신정; hanja: 新正).
Korean New Year generally falls on the day of the second new moon after winter solstice, unless there is a very rare intercalary eleventh or twelfth month in the lead-up to the New Year. In such a case, the New Year falls on the day of the third new moon after the solstice; the next occurrence of this will be in 2033.