zenith
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{adj: zenithal} relating to or located at or near the zenith
{n: hour angle, 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
{n: nadir} the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected
<-> zenith
{n: observer's meridian} a meridian that passes through the observer's zenith
{n: vertical circle} a great circle on the celestial sphere passing through the zenith and perpendicular to the horizon
{n: zenith} the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected
<-> nadir
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