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.
^Hofmann-Wellenhof, B.; Moritz, H. (2006). Physical Geodesy (2nd ed.). Springer. ISBN 978-3-211-33544-4.
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sections: the display, vertical controls, horizontal controls and trigger controls. The display is usually a CRT with horizontalandvertical reference lines...
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