…Historically, it was calculated based on the surface length per minute of the Earth's mean meridian, or on the function of a ship's towbar, and was therefore inconsistent; for example, in the UK it was 6,080 feet (1,853.1824 m), and in the US it was 6,080.2 feet (1,853.1887 m). A speed of 1 nautical mile per hour is called a knot (kn), and is used to express the speed of ships and other objects. It is a unit that is not recommended from the standpoint of the International System of Units. … *Some of the terminology explanations that mention "kn" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…歴史的には,地球の平均子午円の中心角1分に対する地表上の長さ,または船舶の曳航測程儀の機能から割り出されてきたために不統一で,例えばイギリスでは6080フィート(1853.1824m),アメリカでは6080.2フィート(1853.1887m)であった。毎時1カイリの速さを1ノットknot(kn)といい,船舶などの速さを表すのに用いられる。国際単位系の立場からは推奨しがたい単位である。… ※「kn」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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