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- The zenith is the point on the celestial sphere directly overhead the observer. It has an altitude of +90 o in the horizontal coordinate system.
astronomy.swin.edu.au › cosmos › Z
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.
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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).
The meridian is the circle running from one pole to the other through a point directly overhead for an observer. The point directly overhead is called the zenith (and the point 180º away is called the nadir). Several different coordinate systems are useful depending on the situation:
Searches related to define zenith astronomy unit of measurement system
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
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.
The astronomical system of units, formerly called the IAU (1976) System of Astronomical Constants, is a system of measurement developed for use in astronomy.
A system of measurement based on powers of ten, with fundamental units of kilograms for mass, meters for length, and seconds for time.
