What is a zenith angle?

A zenith angle is defined as the angle measured from the vertical line directly above a point (the zenith) downwards towards an object or point of interest. This angle is crucial in surveying as it helps in determining the position of points in three-dimensional space. When the zenith angle is measured downward, it provides valuable information about the relative position of objects in elevation.

Understanding the importance of the zenith angle is essential for various surveying applications, particularly in geodesy and construction projects, where precise measurements are necessary for accurate layout and design. By measuring the zenith angle, surveyors can calculate heights and distances that are integral to their work.