Longitude
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Longitude ( or ), is a geographic coordinate that specifies the east-west position of a point on the Earth's surface. It is an angular measurement, usually expressed in degrees and denoted by the Greek letter lambda (λ). Points with the same longitude lie in lines running from the North Pole to the South Pole. By convention, one of these, the Prime Meridian, which passes through the Royal Observatory, Greenwich, England, establishes the position of zero degrees longitude. The longitude of other places is measured as an angle east or west from the Prime Meridian, ranging from 0° at the Prime Meridian to +180° eastward and −180° westward. Specifically, it is the angle between a plane containing the Prime Meridian and a plane containing the North Pole, South Pole and the location in question. This forms a right-handed coordinate system with the z axis (right hand thumb) pointing from the Earth's center toward the North Pole and the x axis (right hand index finger) extending from Earth's center through the equator at the Prime Meridian.
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- Related: American Practical Navigator, Cardinal direction, Geodesy, Geodetic system, Geographic coordinate system, Geographical distance, Geotagging, Great-circle distance, History of longitude, Horse latitudes, Latitude, Meridian arc, Natural Area Code, Navigation, World Geodetic System
| Resources for determining your latitude and longit... Resources for determining your latitude and longitude jan.ucc.nau.edu/~cvm/latlon_find_location.html - Web |
| IAU/IAG Working Group On Cartographic Coordinates ... IAU/IAG Working Group On Cartographic Coordinates and Rotational Elements of the Planets and Satellites www.hnsky.org/iau-iag.htm - Web |
| "Longitude forged" "Longitude forged" entertainment.timesonline.co.uk/.../article5136819.ece - Web |
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| Longitude And Latitude Of Points of Interest Longitude And Latitude Of Points of Interest www.thegpscoordinates.com - Web |
| Length Of A Degree Of Latitude And Longitude Calcu... Length Of A Degree Of Latitude And Longitude Calculator www.csgnetwork.com/degreelenllavcalc.html - Web |
