Astrophysics (Index)About

zenith

(spot on the sky directly above something)

The zenith is the point in the celestial sphere directly above you, or some object on the face of the Earth. In the horizontal coordinate system, any coordinate with altitude 90° indicates the zenith. The nadir (of the celestial sphere) is the direction opposite the zenith, i.e., straight down through the Earth.


The term zenith is less formally used for the highest point a body reaches in the sky, e.g., on a particular day, such as the Sun reaching its zenith.


(celestial sphere)
Further reading:
http://en.wikipedia.org/wiki/Zenith

Referenced by pages:
airmass
Arecibo Observatory (NAIC)
CCAT-prime (CCAT-p)
celestial equator
circle of latitude
FAST
horizontal coordinate system
Large Zenith Telescope (LZT)
meridian
photographic zenith tube (PZT)
sidereal
solar time
twinkling

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