…All modern time systems, such as mean solar time and Coordinated Universal Time, start counting from noon, but Greenwich Mean Time (GMT) before 1925 started counting from noon and was used primarily for astronomy. In the UK and US, am and pm are often used to indicate morning and afternoon. These are abbreviations of ante meridiem and post meridiem, respectively, and both come from Latin. … *Some terminology explanations that mention "am" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…現在の平均太陽時や協定世界時などの時刻はすべて正子を0時として数え始めるが,1925年以前のグリニジ平均時(GMT)は正午を0時として数え始めたもので,もっぱら天文学用であった。英・米語では午前,午後の表示にa.m.,p.m.をよく用いる。これらはそれぞれante meridiem,post meridiemの略で,いずれもラテン語に由来する。… ※「a.m.」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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