Meridian

Line between the poles with the same longitude
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line of longitude
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Meridian markers
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5/1/2004
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A (geographic) meridian (or line of longitude) is the half of an imaginary great circle on the Earth's surface, terminated by the North Pole and the South Pole, connecting points of equal longitude, as measured in angular degrees east or west of the Prime Meridian. The position of a point along the meridian is given by that longitude and its latitude, measured in angular degrees north or south of the Equator. Each meridian is perpendicular to all circles of latitude. Each is also the same length, being half of a great circle on the Earth's surface and therefore measuring 20,003.93 km (12,429.9 miles).
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Lines of longitude
Line of longitude
Magnetic meridian
Meridian in geography
Geographic meridian
Geographical meridian
Circle of longitude
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