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Scope: 析津志輯佚
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析津志輯佚

49 十六年詔安南王相敦遣赴都,九月入見,詔於太史院改歷。十七年二月副樞領太史易教、領太史衡及公等上改歷。奏曰:臣等編考自漢以來歷書四十餘家,精思推算,晝夜測驗,舊儀難用,而新者未備。故日行盈縮,月行疾遲,五行周天,其詳皆未精察,四方亦未測驗參考。臣等共議,權以新儀木表與舊儀所測相較,得今歲冬至晷景及日躔所在,與所舍分度之差,大都北極之高下,晝夜刻長短,參以古制,創立新法推算,成辛巳歷。雖或未精,然比之前改歷者,附會歷元,更立日法,令踵故習,顧亦無愧。然立每歲測驗,修改歷二三十年,庶盡其法。可使如三代日官,守其職,測驗恆久,無改歲之事矣!又合朔歷日,日行歷四時一周,謂之一歲。日逾一周,複與日合,謂之一月。一月之始,日月相合,故謂合朔。自秦廢歷,紀漢太初止,用平朔法,大小相間或有二大者,故曰食多在晦日或二日,測驗時刻亦鮮中。宋何承天測驗四十餘年,進元嘉歷。始以月行遲速定小餘,以正朔望,使食必在朔,名定朔法,有三大二小。時以異舊罷之。梁虞𠚳造大同歷,隋劉孝孫造皇極歷,皆用定朔,為時所沮。唐傅仁均造戊寅歷,定朔始得行。貞觀十九年四月頻大,人皆異之,竟改從平朔。李淳風造麟德歷,雖用平朔,遇四大則避。又言以平朔間之,又希合當世,為進朔法,使無元日之時。至一行造大衍歷,謂天事誠密,四大二小何傷?誠為確論,然亦循常不改。臣等更造新歷,一依前賢定論,推算皆改從實。今十九年歷,自八月後,四月並大,實日月合朔之數也。是日,方列跪未讀奏,詔賜魯齋及公坐,論曰:卿二老毋自勞,謹教示諸人耳。四月授集賢學士兼太史院事。(出墓志。)

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