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日，一般指地球日，是时间单位。
时长单位，也称天，大約是地球相對太陽自轉一周之时长，即一晝夜循環。自1967年后，科学上「日」已经由國際度量衡局（BIPM）以原子能階躍遷规定为86400秒。一日 =...