竖直角指在同一竖直面内一点到目标的方向线与水平线之间的夹角。
竖直角则是两个方向的竖盘读数之差。
The vertical Angle refers to the difference between the vertical readings.
不过构成竖直角的其中一个方向是水平(视)线。
However, one of the directions which consists of the vertical Angle is horizontal.
大气竖直折射是影响竖直角观测精度的关键因素之一。
Vertical atmosphere refraction calculation was a difficult problem all along.
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