The traditional East Asian calendars divide a year into 24 solar terms (節氣). Chūnfēn (pīnyīn) or Shunbun (rōmaji) (Chinese and Japanese: 春分; Korean: 춘분; Vietnamese: Xuân phân; literally: "vernal equinox") is the 4th solar term. It begins when the Sun reaches the celestial longitude of 0° and ends when it reaches the longitude of 15°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 0°. In the Gregorian calendar, it usually begins around 20 March and ends around 4 April (5 April East Asia time).
春分是春季九十天的中分點。農曆的二十四節氣之一。太陽位於黃經0°。
《月令七十二候集解》：「二月中，分者半也，此當九十日之半，故謂之分。秋同義。」《春秋繁露·陰陽出入上下 篇》說：「春分者，陰陽相半也，故晝夜均而寒暑平。」
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