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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 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, 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.
- The Editors of Encyclopaedia Britannica
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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.
Mar 28, 2024 · Zenith distance is a term used in astronomy to describe the angle between a celestial object and the observer’s zenith, which is the point directly overhead. It is measured along the observer’s vertical circle, which is a great circle passing through the zenith and the celestial object.
In a scientific context, the zenith is the direction of reference for measuring the zenith angle (or zenith angular distance), the angle between a direction of interest (e.g. a star) and the local zenith - that is, the complement of the altitude angle (or elevation angle).
Nov 16, 2022 · The point in the sky that is directly above you is called your “zenith”. The point directly below you, straight down (which you can’t see since the earth is in the way) is called your “nadir”.
