地球形状数学表达公式
（1）应用测量方法以定地球之形状及大小：自秘鲁测量完毕地偏之说为人公认后，量地学又入一新时期，计算经线之长度所根据之标准不复为正球体而为一椭圆之旋转体，其离心率为e=
，椭率为f=
，任何两线度
及
间之经长为：
式中，a及b为长径及短径；
（2）应用加速率测量以求地球之形状：
式中，
N为地形高出（或低于）自转球之距离；G为平均加速度；△g为某定点之加速率差数（实测者与由自转球面所计算者之差）；θ为定点至任何一点之角距。
（3）应用加速率及月角差观测以计算地球之长径：
式中，a为地球长径；W为地球自转之角速率；
；R为地球至月球之距离；T为月球绕地球一周所需之平时；M及m为地球与月球之总重量；
为万有引力常数；g∙e=9.78052m；
=0.0034678。
（4）应用月球之不规则运动以定椭率：
式中，变量及参数含义同上。
参考文献：
方俊：地球的形状。地理学报1935,2（1）
The earth says that the earth is a hollow planet theory, the theory also often think that the earth has a suitable human living inside the surface. Although, in the history of a period of time, the adventures of the literary works make this theory become popular and common. But now the idea has only received little support, and most scientists agree that the earth is a solid celestial body and that the geocentric cavity is said to be pseudo-science.
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