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清·李光地 等奉敕撰 · Chapter 190 / 273

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Chapter 190 of 273

按上者周天四分之一也月犹银丸受光含影自合朔后去日渐逺日照其西故自下视之如银钩然是三日而哉生明也至初八日间去日九十度日照其半西明而东暗如弓之平分也因自亏而向盈故曰上

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