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  1. Knot (unit) - Wikipedia

    The knot (/ n ɒ t /) is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.150 78 mph or 0.514 m/s). The ISO standard symbol for the knot is kn . [2] The same symbol is preferred by the Institute of Electrical and Electronics Engineers ( IEEE ); kt is also common, especially in aviation, where it is the ...

    • Usage

      The speeds of vessels relative to the fluids in which they...

    • Origin

      Until the mid-19th century, vessel speed at sea was measured...

    • Modern use

      Although the unit knot does not fit within the SI system,...

    • Chip Log

      The Oxford Companion to Ships and the Sea, Peter Kemp ed.,...

    • Knots

      A knot is an intentional complication in cordage which may...

  2. People also ask

    What is a nautical mile and why do we have them?

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  3. A knot is a unit of speed. It is abbreviated kt or kn. It is a non-SI unit accepted for use with the SI.It is used around the world in meteorology and for maritime and aviation purposes.

  4. Talk:Knot (unit) - Wikipedia

    Knot (unit)#Origin includes: This method gives a value for the knot of 20.25 in/s, or 1 851.66 m/h. The difference from the modern definition is less than 0.02%. A recent edit changed the finish to "less than 0.13%". I restored the original based on these calculations:

    • Definitions
    • Usage
    • Origin
    • Modern Use
    • See Also
    • Further Reading

    1 international knot =

    1. 1 nautical mile per hour(by definition), 2. 1.852 kilometres per hour (exactly), 3. 0.51444 metres per second (approximately), 4. 1.15078 miles per hour (approximately), 5. 20.25372 inches per second (approximately) 6. 1.68781 feet per second (approximately).

    The speeds of ves­sels rel­a­tive to the flu­ids in which they travel (boat speeds and air speeds) are mea­sured in knots. For con­sis­tency, the speeds of nav­i­ga­tional flu­ids (tidal streams, river cur­rents and wind speeds) are also mea­sured in knots. Thus, speed over the ground (SOG) (ground speed (GS) in air­craft) and rate of progress to­wards a dis­tant point ("ve­loc­itymade good", VMG) are also given in knots.

    Until the mid-19th cen­tury, ves­sel speed at sea was mea­sured using a chip log. This con­sisted of a wooden panel, at­tached by line to a reel, and weighted on one edge to float per­pen­dic­u­larly to the water sur­face and thus pre­sent sub­stan­tial re­sis­tance to the water mov­ing around it. The chip log was cast over the stern of the mov­ing ves­sel and the line al­lowed to pay out. Knots placed at a dis­tance of 47 feet 3 inches (14.4018 m) from each other, passed through a sailor's fin­gers, while an­other sailor used a 30-sec­ond sand-glass (28-sec­ond sand-glass is the cur­rently ac­cepted tim­ing) to time the operation. The knot count would be re­ported and used in the sail­ing mas­ter's dead reck­on­ing and nav­i­ga­tion. This method gives a value for the knot of 20.25 in/s, or 1.85166 km/h. The dif­fer­ence from the mod­ern de­f­i­n­i­tion is less than 0.02%. De­riva­tion of knots spac­ing: 1kn=1852m/h=0.5144m/s{\\displaystyle 1{\\textrm {kn}}=1852{\\textrm {m/h}}=0.5144{...

    Al­though the unit knot does not fit within the SI sys­tem, its re­ten­tion for nau­ti­cal and avi­a­tion use is im­por­tant be­cause the length of a Nau­ti­cal Mile, upon which the knot is based, is closely re­lated to the size of the Earth. As a re­sult, nau­ti­cal miles and knots are con­ve­nient units to use when nav­i­gat­ing an air­craft or ship. Stan­dard nau­ti­cal charts are on the Mer­ca­tor pro­jec­tion and the hor­i­zon­tal (East-West) scale varies with lat­i­tude. On a chart of the North At­lantic, the scale varies by a fac­tor of two from Florida to Green­land. A sin­gle graphic scale, of the sort on many maps, would there­fore be use­less on such a chart. Since the length of a nau­ti­cal mile, for prac­ti­cal pur­poses, is equiv­a­lent to about a minute of lat­i­tude, a dis­tance in nau­ti­cal miles on a chart can eas­ily be mea­sured by using di­viders and the lat­i­tude scales on the sides of the chart. Re­cent British Ad­mi­ralty chartshave a lat­i­tude scale down...

    Kemp, Peter (editor). The Oxford Companion to Ships and the Sea. Oxford university Press, 1976. ISBN 0-19-282084-2

  5. Knot (unit) - Wikipedia

    The knot is a unit o speed equal tae ane nautical mile (1.852 km) per oor, naur aboots 1.151 mph. References This page wis last eeditit on 20 Dizember 2015, at 09:41. ...

  6. Knot_(unit) : definition of Knot_(unit) and synonyms of Knot ...

    The knot (pronounced not) is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.151 mph. [1] The abbreviation kn is preferred by the International Hydrographic Organization (IHO), which includes every major sea-faring nation; [2] but the abbreviations kt (singular) and kts (plural) are also widely used [3] conflicting with the SI symbol for kilotonne which is also ...

  7. Knot | measurement | Britannica

    Knot, in navigation, measure of speed at sea, equal to one nautical mile per hour (approximately 1.15 statute miles per hour). Thus, a ship moving at 20 knots is traveling as fast as a land vehicle at about 23 mph (37 km/hr).

  8. Knot (unit) - Unionpedia, the concept map

    Knot (unit) and Royal Yachting Association · See more » Rudyard Kipling. Joseph Rudyard Kipling (30 December 1865 – 18 January 1936)The Times, (London) 18 January 1936, p. 12 was an English journalist, short-story writer, poet, and novelist. New!!: Knot (unit) and Rudyard Kipling · See more » Speed

  9. Knot (unit) -

    knots knot kn kt kts knots Knots (speed) knotss knotter kt. The knot is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.15078 mph or 0.514 m/s). wikipedia 1,970 Related Articles