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zenith, point on the celestial sphere directly above an observer on the Earth. The point 180° opposite the zenith, directly underfoot, is the nadir. Astronomical zenith is defined by gravity; i.e., by sighting up a plumb line.
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The zenith (UK: / ˈzɛnɪθ /, US: / ˈziːnɪθ /) [1] 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.
Nov 14, 2023 · Understanding what Zenith is in Astronomy is vital for astronomers and navigators. It helps in tracking celestial bodies and understanding Earth’s rotation. The zenith point also aids in calibrating telescopes, making it an indispensable tool in astronomical observations.
1. : the point of the celestial sphere that is directly opposite the nadir and vertically above the observer see azimuth illustration. 2. : the highest point reached in the heavens by a celestial body. 3. : culminating point : acme. at the zenith of his powers John Buchan.
Definition. The zenith is the point in the sky that is directly above an observer's position on the Earth's surface. It represents a 90-degree angle from all points on the horizon.
Zenith. The zenith is the point in the sky vertically straight above the observer. It is the point where the observer's sight-line is perpendicular to the Earth's atmosphere, and hence where the smallest amount of air – termed the airmass – lies along it.
The point on the celestial sphere directly overhead for an observer is the zenith. An imaginary arc passing through the celestial poles and through the zenith is called the observer's meridian.
