Modern geodesy, is used the stars to determine the earth a between meridianarc length.
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。
2
As long as the precise sensing a meridianarc length, we can easily calculate the circumference of the earth.
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。
3
The solution of arc length of sectional ellipse for geodetic problem, which is based on the direct algorithm of meridianarc length is introduced in this paper.