zenith distance

• n. 天顶角距

zenith distance的用法和样例：

例句

用作名词 (n.)

1. The coherence length revised is smaller than the classical, because the revised zenith angle is larger than the launch angle.
   修正后的相干长度总比传统相干长度偏小，因为修正后的天顶角比发射角大。