meridional distance
... meridional difference ==> 纬差 meridional distance ==> 子午线距离 meridional fibers ==> 经线纤维,经线纤维 ...
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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 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.
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