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- Dictionaryzenith/ˈzɛnɪθ/
noun
- 1. the time at which something is most powerful or successful: "in 1977, punk was at its zenith"
- 2. the point in the sky or celestial sphere directly above an observer.
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noun
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The zenith 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. Wikipedia