A unit of length used in navigation and aviation. Nautical mile. Also written as ', the symbol ' is sometimes used. One nautical mile is 1852 m. Originally, one nautical mile was introduced as the length on the Earth's surface for one minute of latitude on the prime meridian, but its length varies depending on the latitude. Many countries have used the value of 1852 m as the length of one minute at 45 degrees latitude. In the United States and the United Kingdom, a value slightly larger than this was used as one nautical mile, but the aforementioned value was adopted as the international nautical mile. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
航海,航空に用いられる長さの単位。海里。浬とも書き,記号′を用いることもある。1カイリは 1852m。もともと 1カイリは子午線の緯度 1分に対する地表面上の長さとして導入されたが,その長さは緯度により異なる。多くの国では緯度 45度における 1分の長さとして 1852mの値が使われてきた。アメリカ合衆国やイギリスではこれより少し大きい値を 1カイリとしていたが、前述の値が国際カイリとして採用された。
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