zenith

thumb|upright=1.25|right|Diagram showing the relationship between the zenith, the nadir, and different types of [[horizon]] The zenith (, ) is the imaginary point on the celestial sphere directly "above" a particular location. "Above" means in the vertical direction (plumb line) opposite to the gravity direction at that location (nadir). The zenith is the "highest" point on the celestial sphere. The direction opposite of the zenith is the nadir.

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The zenith is an imaginary point on the celestial sphere that lies directly above any particular location on Earth, determined by the direction opposite to gravity at that spot. It matters because it provides a reference point for describing the positions of stars and celestial objects in the sky, making it a fundamental concept in astronomy and navigation.

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Commons category: Zenith (topography)

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Origin
Relevance and use
Zenith star
See also
References
Further reading

==Origin== The word zenith derives from an inaccurate reading of the Arabic expression (), meaning "direction of the head" or "path above the head", by Medieval Latin scribes in the Middle Ages (during the 14th century), possibly through Old Spanish. It was reduced to samt ("direction") and miswritten as senit/cenit, the m being misread as ni. Through the Old French cenith, zenith first appeared in the 17th century.