The horizon line, in a conical projection system, is the geometric place in which all the vanishing points of the projections of horizontal lines in space are found. It is a straight line on the projection plane, the result of the intersection of the projection plane with a horizontal plane that passes through the origin or point of view of the projective system........

An intuitive example of a horizon line is the line that divides the sea from the sky in a panoramic view on the coast.

The following points are usually defined on the horizon line: