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3.地球形状和大小示意图地球赤道半6378.14km,极半径6356.76km,两者相差约21.4km,说明地球并非正球体,而是两极稍扁、赤道略鼓的扁球
3. The shape and size of the Earth map Sequentially, the earth equator is about 6378.14 km and the polar radius is 6356.76 km. The difference between the two is about 21.4 km, which means that the Earth is not an orthomesphere, but is a flat ball with two poles slightly flat and a little equator.