The traditional East Asian calendars divide a year into 24 solar terms. Dàhán, Daikan, Daehan, or Đại hàn(Chinese and Japanese: 大寒; pinyin: dàhán; rōmaji: daikan; Korean: 대한; romaja: daehan; Vietnamese: đại hàn; literally: "major cold") is the 24th solar term. It begins when the Sun reaches the celestial longitude of 300° and ends when it reaches the longitude of 315°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 300°. In the Gregorian calendar, it usually begins around 20 January and ends around 4 February.