Vertical and horizontal
Directional planes / From Wikipedia, the free encyclopedia
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For other uses, see Vertical and horizontal (disambiguation).
In astronomy, geography, and related sciences and contexts, a direction or plane passing by a given point is said to be vertical if it contains the local gravity direction at that point.[1]
Conversely, a direction or plane is said to be horizontal (or leveled) if it is perpendicular to the vertical direction. In general, something that is vertical can be drawn from up to down (or down to up), such as the y-axis in the Cartesian coordinate system.