There are two kinds of shogatsu, which are: 'oh-shogatsu' (large shogatsu) which is based on New Year's Day according to the solar calendar; and 'ko-shogatsu' (small shogatsu) which is based on January 15th according to the lunar calendar.
新暦の元日を軸とする「大正月」（おおしょうがつ）と旧暦の15日を軸とする小正月（こしょうがつ）と呼ぶものがある。