为什么是回归年产生四季,而不是恒星年?为什么用朔望月定月球公转�期,而不是恒星月? 知乎 Template




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tomski为什么是回归年产生四季,而不是恒星年?为什么用朔望月定月球公转�期,而不是恒星月? 知乎 coloring