The term "Seollal" generally refers to Eumnyeok Seollal (음력 설날, lunar new year), also known as Gujeong (Hangul: 구정; Hanja: 舊正). Less commonly, "Seollal" also refers 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