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圭表者,度量日影之器也。置圭於正北,日影方可顯於表上,以此定節氣,正曆法也。
昔上古陶寺邦國(或堯也)時,天文官掌之,以測天象,授民時也。
周公置度量日影之器,名曰圭表也。
漢時置圭表於露天,青銅製之,表高八尺,圭長一丈三尺,因其巨大,弗能拆卸,故詳其刻,以便察之。
元時若思造觀星台,觀天象以正曆法也。
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