Terms
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Definition
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A.M.
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Ante Merdian - "before noon"
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P.M.
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Post Merdian - "after noon"
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Atlas
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A book of maps.
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Equator
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The earth's base line and point of it's widest circumference.
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Graticles
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Any organized framework of latitude and longitude used for maps.
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Latitude
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How far north or south of the equator a coordinate lies. 0 degrees = the equator.
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Longitude
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How far east or west of the zero meridian a coordinate lies. 0 degrees = the prime meridian; usually Greenwich, England.
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Meridian
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The lines running vertically around the globe from pole to pole.
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Parallels
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The lines running horizontally around the globe. 0 degrees = the equator. 90 degrees = north pole |
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Prime Meridian
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Noon in Greenwich, England is the generally accepted prime meridian. But a world power can define their meridian anywhere they want. Example: You may see Tokyo at the 0 degree point on a map of Japan, but it is 139 degrees east of Greenwich, England.
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