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 and Declination, can be used to identify the position of stars on the celestial sphere.


Referenced by:
Alpha Centauri
Adaptive Optics (AO)
Arakelian Catalog (Ark)
Baade's Window
Celestial Equator
Cosmic Microwave Background (CMB)
Continuous Viewing Zone (CVZ)
Declination (dec)
Ecliptic Coordinate System
Equatorial Coordinate System
Fsky (fsky)
Galactic Coordinate System
Galactic Plane
Heliocentric System
Holmberg Radius
Horizontal Coordinate System
Magnetic Energy Spectrum
N-Point Function
Provisional Designation
PSF Fitting
Right Ascension (RA)
Spherical Harmonics
Supergalactic Coordinate System
Surface Brightness
Survey-based Designator
Westerhout Radio Survey (W)