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Either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length. 太陽每年通過天赤道的兩個(gè)時(shí)刻中的任何一個(gè)時(shí)刻，在此時(shí)各地的晝夜時(shí)間是等長的。