The point at which horizon lines receding from an observer seem to converge.
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If the reference point and an object are both on the horizon then the angular distance to the object, relative to the reference point is simply the angle formed between the two rays from the observer to object and to the reference point. If either the object or reference point (or both) are not in the plane of the horizon then the appropriate rays are the projections of the rays from the observer onto the plane containing the horizon.
The Horizon.
The two vanishing points are placed apart on the same horizon line (horizontal eye line of viewer). The horizon is the first line to be drawn.
Vertical is up and down and horizontal is side to side. Think of the horizon, it is a line and horizontal has the same root. In fact, one definition of horizontal is parallel to or in the plane of the horizon.
The angle the sun's rays hit a given surface on Earth.And the angle is measured from the horizon up to the position of the sun