Lichun
The traditional East Asian calendars divide a year into 24 solar terms (節氣). Lìchūn (pīnyīn), Risshun (rōmaji), or Ipchun/Ripch'un (romaja) (Chinese and Japanese: 立春;Korean: 입춘(S)/립춘(N);Vietnamese:Lập xuân;literally: "start of spring") is the 1st solar term. It begins when the Sun reaches the celestial longitude of 315° and ends when it reaches the longitude of 330°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 315°. In the Gregorian calendar, it usually begins around February 4 and ends around February 18 (February 19 East Asia time). It's also the beginning of a Sexagenary cycle.