Astrophysics (index)

Celestial Sphere

(the sky in considered as a sphere surrounding the observer)

The Celestial Sphere is the imaginary sphere around an observer, representing the position of stars and astronomical bodies the observer can see by looking in different directions, around and up. The sky hidden "under" the Earth is easily considered a hidden part of the same sphere.

Latitude- and longitude-like coordinates, Right Ascension (RA) and Declination (dec), can be used to identify the position of stars on the celestial sphere.


Referenced by:
Adaptive Optics (AO)
Arakelian Catalog (Ark)
Baade's Window
Celestial Equator
Cosmic Microwave Background (CMB)
Declination (dec)
Ecliptic Coordinate System
Equatorial Coordinate System
Fsky (fsky)
Galactic Coordinate System
Horizontal Coordinate System
N-Point Function
Provisional Designation
PSF Fitting
Right Ascension (RA)
Spherical Harmonics
Supergalactic Coordinate System
Survey-based Designator
Westerhout Radio Survey (W)