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Vertical and horizontal

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In astronomy, geography and related sciences and contexts, a line or plane passing by a given point is said to be vertical if it contains the local gravity direction at that point. Conversely, a line or plane is said to be horizontal (or leveled) if it is perpendicular to the vertical at a given point. By extension, the concept applies to finite objects contained by a line or a plane, such as line segments, plane regions, vectors, directions, etc.