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國際原子時

国际原子时（英語：International Atomic Time、法語：Temps Atomique International, TAI^[1]）是根据以下秒的定义的一种国际参照时标，属于国际单位制。

1967年第13届國際度量衡大會上通过一项决议，定义一秒为铯-133原子基态两个超精细能级间跃迁辐射振荡9,192,631,770周所持续的时间。^[2]^[3]其起点为世界时1958年的开始。

相關條目

原子鐘
時間和頻率轉換
網絡時間協議（以協調世界時的形式普及原子時）

参考资料

^ Temps atomique 1975
^ 国际原子时. 香港天文台. 2012年12月20日 [2013年11月7日]. （原始内容存档于2014年5月2日）.
^ Resolution 1 of the 13th meeting of the CGPM (1967/68). BIPM. [2013年11月7日]. （原始内容存档于2011年1月10日）.

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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