AT (time)
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…Abbreviated as AT. In a broad sense, it is a term that contrasts with astronomical time, which is a time system based on celestial motion, and is a general term for physically uniform time systems based on atomic vibrations. … *Some of the terminology that mentions "AT (time)" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
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…ATと略称する。広義には，天体運動に基づく時刻システムとしての天文時に対比する言葉で，原子振動に基づく物理的に一様な時刻システムの総称である。… ※「AT（時間）」について言及している用語解説の一部を掲載しています。 出典｜株式会社平凡社世界大百科事典 第２版について | 情報 |
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