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《高丽史五十 志卷第四 历一》
421  | ○以所求气去极度数为后气去极度数相 各为其气屈申定数冬至后屈夏至后申。 因测所在冬夏至日晷长短。 但测一至已得不必要复冬夏。 于其戴日之北每度及分晷数校取长短同者便伪所在戴日之北度数及分每气。 各以屈申定数加 之因冬至后者每气以 因夏至后者每气加之各得每气戴日北度数及分也。 因其气所直度分之晷数长短卽各为所在每定初日中晷常数。 其测晷有在表南者亦据其晷尺寸长短与戴日之北每度晷数同者。 因取其所直之度距戴日度反之为出戴日南度然后以屈申定数加 之。 |
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