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腾讯网
1mon
古人怎样确定冬至?测算影长误差竟仅在2毫米左右
早在先秦时期,古人就通过天文仪器圭表上日影的长短,推算冬至和夏至的准确时刻,进而确定二十四节气。那么,古人是如何做的呢? 河南登封的 ...
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