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'''Zenith''', the point of the celestial sphere that is directly opposite the [[nadir]] and vertically above the observer. <ref>[http://www.m-w.com/dictionary/zenith Zenith] Merriam-Webster Online Dictionary </ref>
'''Zenith''', the point of the celestial sphere that is directly opposite the [[nadir]] and vertically above the observer. <ref>[http://www.m-w.com/dictionary/zenith Zenith] Merriam-Webster Online Dictionary </ref>
Astronomical zenith is defined by gravity.
== External links ==
*[http://www.britannica.com/eb/article-9078318/zenith Zenith] Encyclopædia Britannica.
== References ==
== References ==
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[[Category:Astronomy]]