The knot is a unit of speed equal to one nautical mile per hour, which is equal to exactly 1.852 km/h and approximately 1.151 mph. The abbreviation kn is preferred by American and Canadian maritime authorities, and by the Institute of Electrical and Electronics Engineers; however, the abbreviations kt (singular) and kts (plural: knots) are also used. The knot is a non-SI unit accepted for use with the SI. Worldwide, the knot is used in meteorolog...
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The knot is a unit of speed equal to one nautical mile per hour, which is equal to exactly 1.852 km/h and approximately 1.151 mph. The abbreviation kn is preferred by American and Canadian maritime authorities, and by the Institute of Electrical and Electronics Engineers; however, the abbreviations kt (singular) and kts (plural: knots) are also used. The knot is a non-SI unit accepted for use with the SI. Worldwide, the knot is used in meteorology, and in maritime and air navigation—for example, a vessel travelling at 1 knot along a meridian travels one minute of geographic latitude in one hour. Mariners first used the term 'knot' denoting the measure of how many knots in a special line paid out in a given time, using the chip log.
1.852 km is the length of the internationally-agreed nautical mile. The U.S. adopted the international definition in 1954, having previously used the U.S. nautical mile (1,853.248 m). The U.K. adopted the international nautical mile definition in 1970,...
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