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The angle that an observer would lower his or her line of sight below a horizontal line in order to see an object is the **angle of depression.**

An Angle of depression involves 4 items.

- Observer’s eyes

- Line of sight

- Object

- Horizontal

The angle of depression of an object becomes the angle between the horizontal and the line of sight from the object to the observer's eye. The angle of depression will be below the observer’s eyes.