The earth was first proved to be an oblate sphere by survey. It was found that the higher the latitude of a place was, the shorter the straight line distance between every degree of meridian was.
在测量中已发现纬度越高的地点，子午线每一度的直线距离越短，首次用测量方法证明地球为扁圆形。
The earth is an oblate spheroid - a sphere with flattened poles and a slight bulge at the equator.
地球是一个扁平的球体—一个具有扁平的两极和赤道附近稍稍凸出的球体。
He shows that the earth is not a true sphere but an oblate spheroid and calculates the flattering.
他证明地球不是一个真的球而是一个扁球，而且计算了扁平度。
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