Find the angle of depression from horizontal distance and height below eye level.
The angle of depression is the angle between the horizontal and the line of sight looking downward to an object. It equals the angle of elevation measured from the object looking up to the observer (alternate interior angles).
Angle of Depression
θ = arctan(height / distance)
Yes — by alternate interior angles, the depression angle from the top equals the elevation angle from the bottom when measured with the same horizontal.
Looking down from a cliff, a building, or an aircraft to a ground target. It is common in surveying, aviation, and architecture.