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月是历法中个一个辰光单位,照理将,渠长度应该搭月球绕地球公转个自然轨道周期相当,但传统上侪是以月相变化个周期作为一个月个长度,也就是一个月(太阴月)个长度是会合月(朔望月),大约是29.53日。对出土文物符木个研究推断,拉旧石器时代个早期,人类就已经会根据月相来计算日子。
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