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紀 (曆法)

紀是中國古代曆法的時間單位。指蔀之日數與60個干支紀日之最短循環週期^[1]。

文內注釋

^ 後漢書. 卷93志第三《律曆下》: 日周於天，一寒一暑，四時備成，萬物畢改，攝提遷次，青龍移辰，謂之歲。歲首至也，月首朔也。至、朔同日謂之章，同在日首謂之蔀，蔀終六旬謂之紀，歲朔又復謂之元。

基本概念

取法自然	銀河年默冬章年季月日

人為單位	秒分刻时周旬年代世纪千纪

中國古代曆法時間單位	元紀蔀章歲月旬日辰更點刻

印度古代時間單位	大時須臾羅豫腊缚彈指坦剎那瞬頃念刹那生滅

取自物理理論	普朗克時間

天文的年

天文的月

天文的日

天文的時

時間標準

授時與守時

授時	原時曆元岁差均時差偕日升

守時	地方平時时区標準時間

其他

参见：数量级 (时间) · 地质年代 · 年代学

分类

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