An equatorial bulge is a difference between the equatorial and polar diameters of a planet, due to the centrifugal force of its rotation. A rotating body tends to form an oblate spheroid rather than a sphere.
例句与用法
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Instead of assuming the earth to be a perfect sphere , this function takes into account the actual polar flattening of the earth and the equatorial bulge , which gives a much more accurate computation between the given coordinates 它没有假设地球是一个完整的球面，而是考虑了地球的极轴扁平率和赤道鼓起率，这样就给出了两个坐标间更精确的距离。
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