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Mile

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Mile is the name of several units of length; today, one mile is mainly equal to about 1609 metres on land and 1852 metres at sea and in the air, but see below for the details.

Table of contents
1 Current definitions
2 History
3 See also
4 External Link

Current definitions

The meanings of mile that are commonly used today are:

  • The international mile is the one typically meant when the word "mile" is used without qualification. It is defined to be precisely 1609.344 m or 5280 international feet. It is used in the US and UK as part of the Imperial system of units. The international mile is equal to 8 furlongs, or 1760 international yards.
  • The U.S. survey mile or statute mile is precisely equal to 6336/3937 kilometres or 5280 U.S. survey feet, approximately 1609.347 metres. One international mile is precisely equal to 0.999998 survey miles. The survey mile is used by the U.S. Coast and Geodetic Survey.
  • The international nautical mile is defined to be exactly 1852 metres. It is used universally for aviation, naval and maritime purposes and originated from the geographical mile.
  • In Norway and Sweden, a distance of 10 kilometres is most commonly referred to as a mile, see mil.

History

Throughout history many units of length named 'mile' have been used, with widely differing definitions, originating with the Roman mile of approximately 1479 metres. A Roman mile consisted of 1000 'double steps', or two strides by a Roman soldier. The word mile is derived from the word millia passuum, a thousand paces. Along the roads built by the Romans throughout Europe, it was common to erect a stone every mile to announce the distance to Rome, the so-called milestones.

In navigation, the geographical mile was commonly used, defined as 1 minute of arc along the Earth's equator, approximately equal to 1855 metres.

The name statute mile goes back to Queen Elizabeth I of England who redefined the mile from 5000 feet to 5280 feet by statute in 1593.

When the international mile was agreed upon in 1959, the survey mile was retained for measurements derived from US geodetic surveys.

In Denmark and most of Germany the mile in the 19th century was an approx. 7.5 km geographical mile (determined by 4 minutes of arc) specified by Ole RÝmer. In parts of Germany there also existed an exact 7.5 km metric mile variant, but it mostly went out of use at the beginning of the 20th century. The Ole RÝmer mile was for a long time used as a sea mile in Scandinavia, but was in the middle of the 20th century replaced by the international nautical mile. The international nautical mile is still often referred to by traditionalist Scandinavians as a quarter mile.

See also

External Link


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