Astrophysics (index)about

Celestial Sphere

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

The Celestial Sphere is the sky thought of as an imaginary sphere around an observer (basically, around the Earth, or in some cases the Sun), representing the position of stars and astronomical bodies the observer can see by looking in different directions, around and up. The portion of the sky hidden "under" the Earth is easily considered a hidden part of the same sphere.

Celestial Coordinate Systems, such as Equatorial Coordinate System (with its Latitude- and longitude-like coordinates, Declination and Right Ascension), can be used to identify the position of stars and other objects on the celestial sphere.


(astronomy,sky,coordinates)
http://en.wikipedia.org/wiki/Celestial_sphere

Referenced by:
Alpha Centauri
Angular Power Spectrum
Adaptive Optics (AO)
Arakelian Catalog (Ark)
Astrometry
Epoch B1950.0
Baade's Window
Bayer Designation
Blind Survey
Celestial Equator
Cosmic Microwave Background (CMB)
Continuous Viewing Zone (CVZ)
Declination (dec)
Ecliptic
Ecliptic Coordinate System
Epicycle
Equatorial Coordinate System
47 Tucanae (47 Tuc)
Fsky (fsky)
Galactic Coordinate System (GCS)
Galactic North
Galactic Plane
Gould's Belt
Guide Star Catalog (GSC)
Gravitational Wave (GW)
GW170817
Hellings and Downs Curve
Heliocentric System
HIPASS
Holmberg Radius
Horizontal Coordinate System
International Celestial Reference System (ICRS)
Lockman Hole
Magnetic Energy Spectrum
Meridian
Meteoroid
Moving-Cluster Method
Nebula
N-Point Function
Opposition
Plate Scale
Position Angle
Provisional Designation
PSF Fitting
Redshift-angular Size Relation
Right Ascension (RA)
Radio Source (RS)
Sidereal
SIMSTACK
Solar Apex
Solar Time
Solid Angle (Ω)
Solstice
Spherical Harmonics
Supergalactic Coordinate System
Superluminal Motion
Surface Brightness
Surface Density (Σ)
Survey-based Designator
Survey Field
Synoptic
Transit Telescope
Westerhout Radio Survey (W)

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