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For other uses, see Zenith (disambiguation).
Diagram showing the relationship between the zenith, the nadir, and different types of horizon. Note that the zenith is opposite the nadir.

The zenith is an imaginary point directly "above" a particular location, on the imaginary celestial sphere. "Above" means in the vertical direction opposite to the apparent gravitational force at that location. The opposite direction, i.e. the direction in which gravity pulls, is toward the nadir.

Zenith may be used as a name which means success and power.


The root of the word "zenith" in Proto-Indo-European was reconstructed as '*mei-' ("to change"). In Latin we find 'meare' ("to pass"). With the prefix 'sē-' ("aside") it became 'sēmeare' ("to branch off"). Then the noun 'sēmita' ("side-way") was formed.[1] When the Romans occupied Syria, shortly before the time of Christ, the resident Arameans adopted the word 'sēmita' as 'simta' ("side-way").[2] The Romans left. As the Arabians conquered the land in the seventh century they took the word 'simta' from the Arameans as 'samt' ("side-path") and also coined astronomical expressions.[3] The word "zenith" derives from the inaccurate reading of the Arabic expression سمت الرأس (samt ar-ra's), 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', as the "m" was misread as an "ni". Through the Old French 'cenith', 'zenith' first appeared in the 17th century.[4][5]

Relevance and use[edit]

Shadows of trees when the sun is directly overhead (at the zenith). This happens at the solar noon if the tree's latitude equals the sun's declination at that moment.

The term zenith is sometimes used to refer to the highest point reached by a celestial body during its apparent orbit around a given point of observation.[6] This sense of the word is often used to describe the location of the Sun ("The sun reached its zenith..."), but to an astronomer the sun does not have its own zenith, and is at the zenith only if it is directly overhead.

In a scientific context, the zenith is the direction of reference for measuring the zenith angle, the angle between a direction of interest (e.g., a star) and the local zenith.

In astronomy, the altitude in the horizontal coordinate system and the zenith angle are complementary angles, with the horizon perpendicular to the zenith. The astronomical meridian is also determined by the zenith, and is defined as a circle on the celestial sphere that passes through the zenith, nadir, and the celestial poles.

See also[edit]


  1. ^ Wyld, Henry Cecil Kennedy (1932). Universal Dictionary of the English Languages. pp. 715,1089. 
  2. ^ Avinoam, Reuben (1968). Compendious Hebrew – English Dictionary. Tel Aviv: Dvir. 
  3. ^ Fraenkel, Siegmund (1886). Die aramaeischen Fremdwoerter im Arabischen. Leiden. 
  4. ^ "Etymology of the English word zenith". My Etymology. Retrieved March 21, 2012. 
  5. ^ "Zenith". Dictionary.com. Retrieved March 21, 2012. 
  6. ^ "Zenith". Merriam-Webster. Retrieved March 21, 2012. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Zenith — Please support Wikipedia.
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13117 news items

New York Times

New York Times
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Zap2it.com (blog)

Zap2it.com (blog)
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The abyss in the tunnel under the school (which Joe confirms is new, so presumably the dome created it) leads to Zenith, the town near Chester's Mill that both Barbie and Melanie are from. This means Sam and Lyle are both alive and walking around for ...
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As programmatic buying expands, look for agencies to build more private marketplaces in the next 12 to 18 months, says Julian Zilberbrand, EVP Activation Standards, Insights, & Technology at ZenithOptimedia Group in an interview with Beet.TV.
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OPINION: If investing were a recipe, property would be lasagne. It's the dish everyone thinks they know how to make and its basic ingredients are standard, with numerous small variations. Even so, most of us are probably not that good at it and success ...

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