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(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 HA , hour angle
point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected nadir
meridian that passes through the observer's zenith observer's meridian
great circle on the celestial sphere passing through the zenith and perpendicular to the horizon vertical circle
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