近代大地测量中，是利用恒星来测定地球某两地间子午线弧长的。
Modern geodesy, is used the stars to determine the earth a between meridian arc length.
只要精确测知一段子午线弧长，便会很容易地计算出地球的周长。
As long as the precise sensing a meridian arc length, we can easily calculate the circumference of the earth.
根据子午线弧长的计算原理，推导出一个新的子午线弧长计算实用公式。
According to the principle of calculating meridional arc length, a novel practical formula is given in this paper.
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