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| The imaginary great circle around the earth's surface, equidistant from the poles and perpendicular to the earth's axis of rotation. It divides the earth into the Northern Hemisphere and the Southern Hemisphere. |
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| The angular distance north or south of the earth's equator, measured in degrees along a meridian, as on a map or globe |
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| Angular distance on the earth's surface, measured east or west from the prime meridian at Greenwich, England, to the meridian passing through a position, expressed in degrees (or hours), minutes, and seconds. |
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| A representation, usually on a plane surface, of a region of the earth or heavens. |
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| A body with the shape of a sphere, especially a representation of the earth in the form of a hollow ball. |
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| explanatory table of symbols used on a map or chart; also called map legend |
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| A large, usually continuous segment of a surface or space; area |
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| A straight line about which a body or geometric object rotates or may be conceived to rotate. |
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| A half of a sphere bounded by a great circle. |
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