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In physics, an angle of depression means the angle between any two points on a surface that lies along different elevations. In graph paper, it is written as the angle between the x-axis and any point on a map. On a flat surface, the angle of depression indicates the horizontal direction and slope of the surface. For surfaces that are oriented orthogonally to each other, the angle of depression denotes the horizontal angle between the x-axis and any point on the map. In a two-dimensional coordinate system such as a sphere, the angle of depression defines the vertical angle between any two points on the surface. For spherical surfaces, the angle of depression defines the horizontal angle between any two points that lie along any axis of a sphere that revolves around the sphere. In a two-dimensional coordinate system, the normal to the surface on which a point lies is called the horizontal angle of repose. It is the angle that separates the x-axis from the normal to the surface on which ...