'''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> |