Celestial
Sphere: The Imaginary Sphere Surrounding The Earth
Onto Which The Stars Appear Affixed, And Which Appears To Rotate Around The Earth
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Altitude: The Angular Distance Of An Object Above The Horizon
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Azimuth: The Angular Distance Of An Object Along The Horizon, Measured
From Due North In An Eastward Direction
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Zenith: The Point In The Sky Directly Above You..
Nadir: The Point In The Sky Directly Below You
Meridian:
An Imaginary North-South Line In The Sky Passing Directly Overhead. It Divides The Sky
Into Eastern And Western Halves
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