Nautical mile: Difference between revisions
imported>Caesar Schinas (New page: {{subpages}} The '''nautical mile''' is a unit of distance approximately equal to to one minute of arc of latitude, now defined as being exactly 1852 metres. The nautical ...) |
imported>Meg Taylor No edit summary |
||
| Line 1: | Line 1: | ||
{{subpages}} | {{subpages}} | ||
The '''nautical mile''' is a unit of [[distance]] approximately equal | The '''nautical mile''' is a unit of [[distance]] approximately equal to one [[minute of arc]] of [[latitude]], now defined as being exactly 1852 [[metre]]s. | ||
The nautical mile is used in [[navigation]] both at sea and in the air, due to its relationship with geographical coordinates. | The nautical mile is used in [[navigation]] both at sea and in the air, due to its relationship with geographical coordinates. | ||
| Line 20: | Line 20: | ||
*2025 [[yard]]s | *2025 [[yard]]s | ||
*6076 [[foot|feet]] | *6076 [[foot|feet]] | ||
== References == | == References == | ||
{{reflist}} | |||
Revision as of 02:42, 27 October 2013
The nautical mile is a unit of distance approximately equal to one minute of arc of latitude, now defined as being exactly 1852 metres.
The nautical mile is used in navigation both at sea and in the air, due to its relationship with geographical coordinates.
History
The nautical mile was originally defined as one minute of arc along any meridian of earth, and in informal contexts is still defined in this way today. However, due to the fact that the earth is not a perfect sphere, the nautical mile defined in this way varies between approximately 1842 metres at the equator and 1861 metres at the pole.
In 1929 at the International Extraordinary Hydrographic Conference the nautical mile was defined as exactly 1852 metres.
The British nautical mile as used by the Admiralty originally related to distance on the surface of the earth just south of Great Britain, and was defined as being exactly 800 feet longer than a statute mile, making it exactly 6080 feet. The United Kingdom switched to the international definition of 1852 metres in 1970.
Conversions
1 nautical mile is identical to
- 1852 metres
- 1.852 kilometres
1 nautical mile is approximately equal to