How do you calculate nadir angle?

Answer 1

The nadir angle is the angle between the vertical direction and the line of sight to a target from a specific point. To calculate it, you can use the formula: Nadir angle = 90° - θ, where θ is the angle of elevation above the horizontal plane. Alternatively, if you have the altitude of the observer and the distance to the target, you can calculate the nadir angle using trigonometric functions, such as the tangent of the angle being the ratio of the opposite side (height) to the adjacent side (distance).