uh idk but after a google search I think its the line of vision when you look at a downwards angle? idk if that made any sense

is it something to do with geography??? i know that a depression (hehe me) is a hole in the ground,, or something

If the object is below the level of the observer, then the angle between the horizontal and the observer's line of sight is called the angle of depression. thx google didnt understand a single thing