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nounthe point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projectedOpposite:type of:
Definition that contains zenith
- ha (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day
- nadir the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected
- observer's meridian a meridian that passes through the observer's zenith
- vertical circle a great circle on the celestial sphere passing through the zenith and perpendicular to the horizon
- zenithal relating to or located at or near the zenith
- hour angle (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day