春分 (Chinese): Chun-fen (Globe Language) (noun) 4th solar term (Spring equinox), (March equinox), literally in Chinese chun 春 = spring, fen 分 = half.
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In ancient Chinese calendar, Chun-fen is the 4th solar term of the 24 Chinese solar terms ( Jie-chi 节气 ). Chun-fen begins when the Sun reaches the celestial longitude of 0° and ends when Chun-fen reaches the longitude of 15°. In the Gregorian calendar, Chun-fen usually begins around March 21th and ends around April 4th (April 5th East Asia time). Chun-fen more often refers in particular to the day when the Sun is exactly at the celestial longitude of 0°. During Chun-fen the Sun is at the equator dividing the Earth equally into southern and northern hemispheres. Chun-fen refers to the day and night divided by half day and half night, each of which is 12 hours. Chun-fen is in the between Li-chun (beginning of Spring) and Li-xia (start of Summer). Therefore, Chun-fen is on the middle of the Spring which lasts for three months. In ancient China, Chun-fen was also divided into three periods: in the first period 元鸟至 , the swallows would fly from the south. During the second 雷乃发声; there would be lots of thunder and in the third period 始电; you will see lightning when raining. The vernal equinox records in the Chinese ancient calendar: “The sun entered the equator three days before the spring equinox.”