经纬度就是假设的地球的球面坐标,要知道一个城市、一条河流在地球面上的位置,就必须知道这城市、河流的经纬度,地球上定下了这样的坐标,非但在地理学上有了很大的贡献与方便,近代,在军事上,航空上,航海上更有其特殊的意义。要定出地面上某地的经纬度,则有赖於天文测量。经线:在地面上,通过两极作包含地轴之圆,是为子午圈(经圈),圆中自一极到另一极(南北极)的圆弧线称为子午线(经线)。纬线:在地面上,在距离两极相等的地方,作一 Latitude and longitude is the hypothetical spherical coordinate of the earth. To know the location of a city and a river on the surface of the earth, we must know the latitude and longitude of the city and the river. The earth has set such coordinates, not only in geography, but also in Great contributions and conveniences are of special significance in modern times, military affairs, aviation, and navigation. To determine the latitude and longitude of a place on the ground, it depends on astronomical measurements. Warp: On the ground, the circle containing the earth’s axis through the poles is the meridian circle (warp), and the circular line from the pole to the other pole (north and south pole) in the circle is called the meridian (warp). Latitude: On the ground, at the same distance from the poles,