Chiu-fen (noun) 秋分 (Chinese): Autumn equinox (16th solar term), literally in Chinese “chiu” 秋 = autumn, “fen” 分 = half.

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Chiu-fen is the 16th solar term of 24 solar terms in the Chinese lunar year calendar. Chiu-fen begins when the Sun reaches the celestial longitude of 180° and ends when it reaches the longitude of 195°. Chiu-fen often refers in particular to the day when the Sun is exactly at the celestial longitude of 180°. In the Gregorian calendar, Chiu-fen usually begins around September 23 and ends around October 8. In ancient China Chiu-fen was divided into three periods of time:In the first period, thunder stops 雷始收声; the second period insects start to hide 蛰虫坯户; in the last period, water begin to dry 水始涸.  After Chou-fen the weather is cooler and the nights are getting longer in the northern hemisphere, vice versa in the Southern Hemisphere. On June 21, 2018, the Chinese State Council issued an approval to establish Chiu-fen ( in Chinese lunar Calendar) as the “Chinese Farmers Harvest festival” (中国农民丰收节) starting from 2018. 

Since ancient times, Chiu-fen has been a solar term for agricultural purposes in the lunar calendar. Chiu-fen is still remembered and celebrated as a Chinese traditional festival.