The reasons for large variations of azimuthal and zenithal angles of holes drilled are investigated with a view point of mechanics .

从力学观点分析了钻孔方位角和 顶角变化的原因；

Lambert 's zenithal equal-area projection

兰伯特等积 方位投影

Who embeds our career with zenithal achievements ?

是谁给事业镶嵌 巅峰的成就？

The zenithal distance expression based on theoretical value of gravity earth . tide the precise formula for calculating derivative of theoretical value on gravity earth tide is induced by strict mathematical method in this paper .

本文基于计算重力固体潮理论值的 天顶距法，通过严格的理论推导，给出了计算重力固体潮理论值的导数的封闭公式。