Zenith refers to 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. The zenith is the "highest" point on the celestial sphere (meaning it is the farthest up from the gravitational force). Zenith is sometimes used as a given name, most commonly for males.〔(【引用サイトリンク】title=Baby Name Guesser )〕 Its meaning, "highest point," evokes success and power.
The word "zenith" derives from the 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', as the "m" was misread as an "ni". Through the Old French 'cenith', 'zenith' first appeared in the 17th century.〔(【引用サイトリンク】url=http://www.myetymology.com/english/zenith.html )〕〔(【引用サイトリンク】url=http://dictionary.reference.com/browse/zenith )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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