夜晚，当你仰望头顶闪闪繁星或皎皎明月而遐想万千时，有否想过，在你脚底下的地球的另一端是什么地方？这就涉及对足庶点的问题。地球任一直径在地面上的两个端点，互为对足庶点，地球表面各地都有其相应的对足庶点。地理上通常用经线和纬线交织而成的经纬网来说明地球各... At night, when you look up at the stars on the top of your head or dream about the moon and think about it for a long time, have you ever wondered where is the other side of the earth under your feet? This involves the problem of ankle spots. Each of the two ends of the Earth’s diameter on the ground is an ankle-foot point, and there are corresponding pairs of foot and ankle points on the surface of the Earth. Geographically, the latitude and longitude webs, intertwined with warps and wefts, are commonly used to illustrate the earth’s various...