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definitions
zenith (n.)
1.(astronomy)the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected
Merriam Webster
ZenithZe"nith (?; 277), n. [OE. senyth, OF. cenith, F. zénith, Sp. zenit, cenit, abbrev. fr. Ar. samt-urras way of the head, vertical place; samt way, path + al the + ras head. Cf. Azimuth.]
1. That point in the visible celestial hemisphere which is vertical to the spectator; the point of the heavens directly overhead; -- opposed to nadir.
From morn
To noon he fell, from noon to dewy eve,
A summer's day; and with the setting sun
Dropped from the zenith, like a falling star. Milton.
2. hence, figuratively, the point of culmination; the greatest height; the height of success or prosperity.
I find my zenith doth depend upon
A most auspicious star. Shak.
This dead of midnight is the noon of thought,
And wisdom mounts her zenith with the stars. Mrs. Barbauld.
It was during those civil troubles . . . this aspiring family reached the zenith. Macaulay.
Zenith distance. (Astron.) See under Distance. -- Zenith sector. (Astron.) See Sector, 3. -- Zenith telescope (Geodesy), a telescope specially designed for determining the latitude by means of any two stars which pass the meridian about the same time, and at nearly equal distances from the zenith, but on opposite sides of it. It turns both on a vertical and a horizontal axis, is provided with a graduated vertical semicircle, and a level for setting it to a given zenith distance, and with a micrometer for measuring the difference of the zenith distances of the two stars.
synonyms
see also
phrases
Zenith Brand of Probenecid • Zenith Brand of Silver Sulfadiazine • Zenith Brand of Sulfisoxazole • Zenith Brand of Tolnaftate
Astronomy zenith • Au Zénith • Du New Morning au Zénith • HMS Zenith • Indochine au Zénith • Large Zenith Telescope • Le Zénith • Live in Paris Zenith '88 • MV Zenith • Monsieur Zenith • Quasi-Zenith Satellite System • Richard Zenith • Sannine Zenith Lebanon • Sea Zenith • Steven Ericsson-Zenith • The Zenith Angle • USS Zenith (SP-61) • We've the Zenith • Zee Cine Zenith Power Team Award • Zenith (LG) • Zenith (building) • Zenith (comics) • Zenith (disambiguation) • Zenith (watchmaker) • Zenith 248 SX • Zenith Aircraft • Zenith Aircraft Company • Zenith Angle • Zenith Applied Philosophy • Zenith Bank • Zenith Brass Ensemble • Zenith Cable Modem • Zenith Carburetters • Zenith Centre • Zenith Content Management System • Zenith Data Systems • Zenith Electronics • Zenith Glacier • Zenith Insurance Company • Zenith Komarniski • Zenith Lake (Ontario) • Zenith Minisport • Zenith Motorcycles • Zenith Oilfield Technology Limited • Zenith Records • Zenith STOL CH 701 • Zenith STOL CH 801 • Zenith Solar • Zenith Tennis Cup • Zenith Youth Theatre Company • Zenith Z89 • Zenith Zodiac CH 601 • Zenith camera • Zenith computers • Zenith number • Zenith telescope • Zenith the Albino • Zenith, West Virginia • Zénith (Cap-Haïtien) • Zénith d'Orléans • Zénith de Strasbourg
analogical dictionary
sky; heaven; heavens[Classe]
coordonnée céleste (fr)[Thème]
astronomy[Domaine]
Region[Domaine]
point - surface - celestial point[Hyper.]
zenith - empyreal, empyrean - firmamental[Dérivé]
celestial sphere, empyrean, expanse, firmament, heavens, skies, sky, sphere, vault of heaven, welkin[Desc]
celestial point[Hyper.]
zenithal[Dérivé]
celestial sphere, empyrean, expanse, firmament, heavens, skies, sky, sphere, vault of heaven, welkin[Desc]
nadir[Ant.]
zenith (n.)
[astronomy]
Wikipedia
Wikipedia
Zenith
For other uses, see Zenith (disambiguation).
 |
Look up zenith in Wiktionary, the free dictionary. |
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.
Contents |
Origin
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.[1][2]
Relevance and use
Shadows of trees when the sun is directly overhead (at the zenith). This happens at 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.[3] 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 doesn't 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
- Azimuth
- Geodesy
- History of geodesy
- Keyhole problem
- Midheaven
- Nadir
- Subsolar point
- Vertical deflection
- Zenith distance
References
- ^ "Etymology of the English word zenith". My Etymology. http://www.myetymology.com/english/zenith.html. Retrieved March 21, 2012.
- ^ "Zenith". Dictionary.com. http://dictionary.reference.com/browse/zenith. Retrieved March 21, 2012.
- ^ "Zenith". Merriam-Webster. http://www.merriam-webster.com/dictionary/zenith. Retrieved March 21, 2012.
- Glickman, Todd S. (2000). Glossary of meteorology. American Meteorological Society. ISBN 978-1-878220-34-9.
- McIntosh, D. H. (1972). Meteorological Glossary (5th ed.). ISBN 978-0-8206-0228-8.
- Picoche, Jacqueline (2002). Dictionnaire étymologique du français. Paris: Le Robert. ISBN 978-2-85036-458-7.
