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[[Image:Zenit nadir.gif|right|200px]]
[[Image:Zenit nadir.gif|right|200px]]
'''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.
Astronomical zenith is defined by gravity.