The traditional Chinese calendar divides a year into 24 solar terms. The first one is known as lichun in Chinese, risshun in Japanese, ipchun in Korean, and lập xuân in Vietnamese. 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 is also the beginning of a sexagenary cycle. Lichun signifies the beginning of spring in East Asian cultures. Source: Wikipedia (en)