Angle of Elevation

When the observer is looking at an object (P) which is at a greater height than the observer (A), he has to lift his eyes to see the object and an angle of elevation is formed between the line of sight joining the observer’s eye to the object and the horizontal line.

Angle of Depression

When the observer (A) (at a greater height), is looking at an object (at a lesser height), the angle formed between the line of sight and the horizontal line is called an angle of depression.