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)
Further reading:
http://en.wikipedia.org/wiki/Celestial_sphere

Referenced by pages:
Anglo-Australian Telescope (AAT)
Alpha Centauri
angular power spectrum
galactic anticenter
adaptive optics (AO)
plate measuring machine (APM)
appulse
arcsecond (arcsec)
Arakelian Catalog (Ark)
asterism
astrograph
astrometry
epoch B1950.0
Baade's Window
Bayer designation
beam
blind survey
celestial equator
cosmic microwave background (CMB)
cold spot
Compton telescope
continuous viewing zone (CVZ)
cylindrical telescope
data cube
declination (dec)
diffuse emission
double star
drift scan
ecliptic
ecliptic coordinate system
elevation range
epicycle
epoch
equatorial coordinate system
equinox
Exo-S
fixed star
47 Tucanae (47 Tuc)
Fsky (fsky)
galactic coordinate system (GCS)
galactic north
galactic plane
Gould's Belt
Catalog of Circumpolar Stars (Groombridge)
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)
intensity mapping
K2
Lockman hole
magnetic energy spectrum
meridian
meteoroid
moving-cluster method
nebula
N-point function
opposition
optical double
pointing error (PE)
photometry
plate scale
plane of the sky (POS)
position angle (PA)
projected separation
provisional designation
PSF fitting
redshift-angular size relation
right ascension (RA)
radio source (RS)
scan speed
sidereal
SIMSTACK
solar apex
solar time
solid angle (Ω)
solstice
spherical harmonics
stellar association
Stokes parameters
supergalactic coordinate system
superluminal motion
surface brightness (SB)
surface density (Σ)
survey-based designator
survey field
synoptic
transient astronomy
transit telescope
Westerhout Radio Survey (W)
X-ray source (RS)
zenith
zodiacal light

Index