纬度与经度
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定义
纬度和经度是一种地理坐标系，使用角度来唯一标识地球表面上的任意点，纬度范围±90°，经度范围±180°。
解释
Latitude measures distance north or south of the equator (0°), while longitude measures east or west of the Prime Meridian through Greenwich, England. One degree of latitude equals approximately 111 km regardless of position, but one degree of longitude shrinks to zero at the poles. GPS satellites rely entirely on this system to provide positioning accurate to within a few meters.
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