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A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. [2] [3] [4] Historically, it was defined as the meridian arc length corresponding to one minute ( 1 / 60 of a degree) of latitude at the equator, so that Earth's polar circumference is very near to 21,600 nautical miles (that is 60 minutes × 360 degrees).
Minutes (′) and seconds (″) of arc are also used in cartography and navigation. At sea level one minute of arc along the equator equals exactly one geographical mile (not to be confused with international mile or statute mile) along the Earth's equator or approximately one nautical mile (1,852 metres; 1.151 miles). [14]
The geographical mile is an international unit of length determined by 1 minute of arc ( 1 / 60 degree) along the Earth's equator. For the international ellipsoid 1924 this equalled 1855.4 metres. [1] The American Practical Navigator 2017 defines the geographical mile as 6,087.08 feet (1,855.342 m). [2]
A four-minute mile is the completion of a mile run (1.6 km) in four minutes or less. It translates to an average speed of 15 miles per hour (24 km/h). [ 1 ] It is a standard of professional middle-distance runners in several cultures.
As one degree is 1 / 360 of a circle, one minute of arc is 1 / 21600 of a circle – such that the polar circumference of the Earth would be exactly 21,600 miles. Gunter used Snellius's circumference to define a nautical mile as 6,080 feet, the length of one minute of arc at 48 degrees latitude. [24]
1 meridian minute: 1,853.181: nautical mile: Turkey: 1,855.4 (for comparison) 1 equatorial minute: Although the NM was defined on the basis of the minute, it varies from the equatorial minute, because at that time the circumference of the equator could only be estimated at 40,000 km. 2,065: Portugal: 2,220: Gallo-Roman league: Gallo-Roman ...
The student finished the 26.2 miles in 9.5 hours. For 9.5 hours, he walked the same monotonous route, while listening to music and grabbing the occasional glass of water from his friends nearby.
Charles Minthorn Murphy (October 1870 – February 16, 1950), also known as Mile-a-Minute Murphy, was an American cycling athlete. [1] He was the first person ever to ride a bicycle for one mile in less than a minute.