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zenith distance
subjectfact 
zenith distancehas definition Angular distance on the celestial sphere measured along the great circle from the zenith to the celestial object. Zenith distance is 90° minus altitude.has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:33:32.0
is an instance of local coordinate component2001-09-27 09:33:32.0
is an instance of angle2001-09-27 09:33:32.0
local coordinate componentis a component of local coordinate2001-09-27 09:33:32.0
anglehas unit angle unit2001-09-27 09:33:30.0
numberhas value2001-09-27 09:32:57.0