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meridian
Meridian, or a meridian line may refer to
==Science==
* Meridian (astronomy), imaginary circle in a plane perpendicular to the planes of the celestial equator and horizon
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*Central meridian (planets)
* Meridian (geography), an imaginary arc on the Earth's surface from the North Pole to the South Pole
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* Meridian arc
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* Prime meridian, origin of longitudes.
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* Principal meridian, arbitrary meridians used as references in land surveying
* Meridian line, used with a gnomon to measure solar elevation and time of year
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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