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| Origin | |
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The word "zenith" derives from the inaccurate reading of the Arabic expression سمت الرأس (samt ar-ra's) meaning “direction of the head”/"path above the head", by Medieval Latin scribes in the Middle Ages (during the 14th century), probably through Old Spanish. It was incorrectly reduced to 'samt' ("direction") and imprecisely written as 'senit'/'cenit' by those scribes. Through Old French 'cenith', Middle English 'senith' and finally 'zenith' first appears in the 17th century.[2][3]
[edit] Tags:Arabic,Medieval Latin,Middle Ages,Old Spanish,Old French, | |
| Relevance and use | |
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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 zenith is used in the following scientific contexts:
It 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.
It defines one of the axes of the horizontal coordinate system in astronomy.
[edit] Tags:Solar Noon,Latitude,Horizontal Coordinate System, | |
| See also | |
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Geodesy
History of geodesy
Keyhole problem
Midheaven
Nadir
Subsolar point
Vertical deflection
Zenith distance
[edit] Tags:Nadir,Geodesy,History Of Geodesy,Keyhole Problem,Midheaven,Subsolar Point,Vertical Deflection, | |
| References | |
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^ merriam-webster.com
^ myEtymology.com: English etymology of zenith
^ Zenith Definition | Definition of Zenith at Dictionary.com
Huschke, Ralph E. (1959) Glossary of Meteorology, American Meteorological Society, Boston, Second printing-1970.
McIntosh, D. H. (1972) Meteorological Glossary, Her Majesty's Stationery Office, Met. O. 842, A.P. 897, 319 p.
Picoche, J. (1992) Dictionnaire Etymologique du Français, Le Robert, Paris, ISBN 2-85036-458-4.
Retrieved from "http://en.wikipedia.org/w/index.php?title=Zenith&oldid=472347964"
Categories: Celestial coordinate systemArabic words and phrasesTechnical factors of astrologyAstrological house systems
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