地心纬度

经比较证明，用该球体半径计算大圆航程和大圆航向角，比传统的等体积球半径、等距离球半径及地心纬度球半径精度高。

By use of analysis of examples , the author proves that the spherical radius for calculation of spherical distance and spherical azimuth is of higher precision than the original equal volume and equal distance spherical radius and geocentric latitude spherical radius .

结果表明，对于2000海里左右的中程大地距离（罗兰C系统的作用距离范围内），地心纬度球面上的积分长度变形达2～3km。

The result indicate that integral distance distortion on the geocentric latitudinal sphere is 2 ~ 3 km in the about 2 000 miles ( Loran C system ) .

地心纬度球面上的积分长度变形公式

The Distortional Formulate of Integral Distance on the Geocentric Latitudinal Sphere

本文对任意性质双重投影提出了三种应用球体：普通球体、地心纬度球体、高斯第Ⅱ球体。文中分别对这三种球体半径作了推导或说明。

This paper presents and discusses 3 kinds of spheres used in the construction of double projection in arbitrary properties , i. e. , the general sphere , geocentric latitudinal sphere and the Gauss ⅱ sphere .