
Zenith
Imaginary point directly above a particular location, on the imaginary celestial sphere

Imaginary point directly above a particular location, on the imaginary celestial sphere
The zenith (UK: , US: ) is the imaginary point on the celestial sphere directly "above" a particular location. "Above" means in the vertical direction (plumb line) opposite to the gravity direction at that location (nadir). The zenith is the "highest" point on the celestial sphere. The direction opposite of the zenith is the nadir.
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