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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).
With this value for R the meridian length of 1 degree of latitude on the sphere is 111.2 km (69.1 statute miles) (60.0 nautical miles). The length of one minute of latitude is 1.853 km (1.151 statute miles) (1.00 nautical miles), while the length of 1 second of latitude is 30.8 m or 101 feet (see nautical mile).
A geographical mile is defined to be the length of one minute of arc along the equator (one equatorial minute of longitude) therefore a degree of longitude along the equator is exactly 60 geographical miles or 111.3 kilometers, as there are 60 minutes in a degree. The length of 1 minute of longitude along the equator is 1 geographical mile or 1 ...
Nautical mile: Length: Rhumb: Angle: The angle between two successive points of the thirty-two point compass (11 degrees 15 minutes) (rare) [1] Shackle: Length: Before 1949, 12.5 fathoms; later 15 fathoms. [2] Toise: Length: Toise was also used for measures of area and volume Twenty-foot equivalent unit or TEU: Volume: Used in connection with ...
One degree of longitude equals four minutes of time the world over, although in terms of distance, one degree shrinks from 60.15 nautical miles or 111 km [Earth's circumference being 21,653.521 nautical miles, or 24,901.55 statute miles at the Equator], to virtually nothing at the poles.
Route MORAs provide an obstacle clearance within 10 nautical miles (19 km) on both sides of the airways and within a 10-nautical-mile (19 km) radius around the ends of the airways. Grid MORAs provide an obstacle clearance altitude within a latitude and longitude grid block, usually of one degree by one degree. [1]
One minute of longitude along the 53rd parallel is approximately 0.6042 nautical miles (1,224 yd; 1.119 km). One degree of longitude along the 53rd parallel is about 36.252 nautical miles (41.72 mi; 67.14 km).
£10,000 (equivalent to £1.83 million in 2023 [10]) for a method that could determine longitude within 1 degree (equivalent to 60 nautical miles (110 km; 69 mi) at the equator). £15,000 (equivalent to £2.74 million in 2023 [10]) for a method that could determine longitude within 40 minutes.