[10.5.3.4]
NOTE: This term was added in RP-16-17 Addendum 2.
The point on the celestial sphere, directly above the observer, corresponding to an angle of 90 degrees above the horizontal plane.
« Back to Definitions Index[10.5.3.4]
NOTE: This term was added in RP-16-17 Addendum 2.
The point on the celestial sphere, directly above the observer, corresponding to an angle of 90 degrees above the horizontal plane.
« Back to Definitions Index