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:
https://en.wikipedia.org/wiki/Celestial_sphere
https://astronomy.swin.edu.au/cosmos/C/Celestial+Sphere

Referenced by pages:
Anglo-Australian Telescope (AAT)
aberration
Alpha Centauri (α Centauri)
angular distance
angular power spectrum
galactic anticenter
adaptive optics (AO)
plate measuring machine (APM)
appulse
arcsecond (arcsec)
Arakelian Catalog (Ark)
asterism
astrograph
astrometry
astronomical object
AXIS
Baade's Window
baryon acoustic oscillations (BAO)
Bayer designation
beam
BINGO
blind survey
celestial equator
celestial meridian
celestial pole
celestial reference frame
Chandler wobble
Canadian Hydrogen Intensity Mapping Experiment (CHIME)
chopping mirror
cosmic microwave background (CMB)
cold spot
Compton telescope
counterpart
continuous viewing zone (CVZ)
cylindrical telescope
data cube
declination (dec)
destriping
diffuse emission
dirty image
double star
drift scan
Earth rotation synthesis
ecliptic
ecliptic coordinate system
elevation range
epicycle
epoch
equatorial coordinate system
equinox
Exo-S
extended source
Field of Streams
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 (GS)
Guide Star Catalog (GSC)
gravitational wave (GW)
GW170817
Hellings and Downs curve
HEALPix
heliocentric system
HIPASS
Holmberg radius (RH)
horizontal coordinate system
ICRF
International Celestial Reference System (ICRS)
intensity mapping
interferometer
interstellar medium (ISM)
J2000.0 equinox
K2
Limber approximation
Lockman hole
Magellanic Stream
magnetic energy spectrum
MAXIMA
meridian
meteoroid
Milky Way
moving-cluster method
neutrino hotspot
N-point function
Narrabri Stellar Intensity Interferometer (NSII)
opposition
optical double
pointing error (PE)
photometry
plate scale
plane of the sky (POS)
position angle (PA)
projected separation
proper motion (PM)
provisional designation
PSF fitting
redshift-angular size relation
right ascension (RA)
radio source (RS)
scan speed
sidereal
SIMSTACK
supernova survey
solar apex
solar day
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
time-ordered data (TOD)
Toomre sequence
transient
transient astronomy
transit telescope
u-v plane
visibility
Westerhout Radio Survey (W)
X-ray source
zenith
zodiacal light

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