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Scope: 宋書
Condition : Contains text 「穊」
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卷二十三志第十三 天文一

13
古舊渾象以二分為一度,凡周七尺三寸半分。張衡更制,以四分為一度,凡周一丈四尺六寸。蕃以古制局小,星辰稠;衡器傷大,難可轉移。更制渾象,以三分為一度,凡周天一丈九寸五分四分分之三也。

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