<研究ノート> 大衍暦における進朔について : 天平宝字8年～貞観3年の日付の問題

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  • <Note> On a Problem of Dating in the Age of the Daien Calendar (AD 764-861)
  • ダイエンレキ ニ オケル シンサク ニ ツイテ テンピョウ ホウジ 8ネン ジョウガン 3ネン ノ ヒヅケ ノ モンダイ

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It is stated about the calendar of the Nara and Heian Period in this paper. At that time, a complicated calculation was needed to create a calendar, and details were secrets. Therefore, it was the work of the professional officials to create a calendar year by year. However, there is a problem of Shinsaku (進朔) in that calculation process. Shinsaku, as for the meaning, "advance Saku on the next day", is one of the artificial changes toward the result of the calculation. The word Saku (朔) means the solar-lunar conjunction. Sometimes there can be a day that Saku comes out late at night. If Shinsaku rule is applied, the day is decided to be handled as the last day of the former month. If it isn't applicable, the day is noted as the first day of the month. Whether Shinsaku rule is applied or not influences the dating. So it is the problem which can't be ignored when we learn history. But the actual condition of Shisaku rule isn't known well. I want to introduce some views about it.

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