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Definition: Zenith is the imaginary point that is directly above a particular location on the celestial sphere. It is vertically opposite to the apparent gravitational force i.e. directly opposite to the gravitational pull. It is the highest point on the sphere and thus, the farthest up from the gravitational force.
Description: The term zenith is derived from an Arabic expression meaning direction of the head or path above the head.
Zenith is sometimes also used to refer to the highest point that a celestial body reaches during its orbit at a given point of observation. The opposite of zenith, that is the direction of the gravitational pull, is called the Nadir, at 180 degrees.
Zenith, in astronomy terms, is the point in the sky directly overhead. For example, when a person says that the Sun has reached its zenith, it is used to refer to the sun’s position in the sky. According to astronomers, there is no zenith for a Sun’s position but to any observer, the Sun has reached its zenith if it is directly overhead.
The angular distance from the zenith to any celestial body, in space, is called the zenith distance. The nadir which is directly opposite the zenith, has a zenith distance of 180° and the celestial horizon has a zenith distance of 90°.
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