History of Liao 遼史
卷四十三 志第十三: 曆象志中 Volume 43 Treatises 13: Celestial Phenomena 2
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曆象誌中 ○閏考月度不足,是生朔虛;天行有餘,是為氣盈。盈虛相懸,歲月乃牉,積牉而差,寒暑互易,百谷不成,庶政不明。聖人驗以斗柄,準以歲星,爰立閏法,信治百官。是故閏正而月正,月正而歲正。歲月既正,頒令考績,無有不時。國史正歲年以敘事,莫重於此。遼始征歷梁、唐。入晉之後,奄有帝制,《乙未》、《大明》,曆法再變。穆宗應歷六年,周用顯德《欽天曆》;十年,宋用建隆《應天曆》。景宗乾亨四年,宋用《乾元曆》。聖宗統和十九年,宋用《儀天曆》;太平元年,宋用《崇天曆》。道宗清寧十年,宋用《明天曆》;大康元年,宋用《奉元曆》;大安七年,宋用《觀天曆》。天祚皇帝乾統六年,宋用《紀元曆》。五代歷三變,宋凡八變,遼終始再變。曆法不齊,故定朔置閏,時有不同,覽者惑焉。作《閏考》。〈(書540-564頁有表)〉
Chinese text: This work was published before January 1, 1923, and is in the
public domain worldwide because the author died at least 100 years ago.
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