Appendix:Astronomical terms

A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

A
aberration absolute magnitude absolute zero absorption lines accretion disk albedo Alpha Centauri altitude Andromeda Galaxy annular eclipse antapex Antares anthelion apex aphelion apocenter apogee apparent magnitude arc arcsecond Arcturus Ariel armillary sphere arroyo asterism asteroid asteroid belt astrobiology astrolabe astrometeorology astrometric binary astrometry astronomer astronomical unit astronomy astrophotography astrophysics atmosphere atmosphere layers AU aureole aurora axis azimuth

B
Baily's beads barred spiral basin Becklin-Neugebauer object big bang model big crunch Big Dipper binary accretion model binary star biosphere black dwarf black hole blue moon blue shift Bode's law brightline spectrum brown dwarf

C
Callisto canals Canopus carbonaceous chondrites Cassegrain reflector celestial body celestial equator celestial mechanics celestial object celestial pole celestial sphere Ceres Chandrasekhar limit chaos Charon chondrite chromosphere cluster star coelostat collision coma cluster comet comet tail conjunction constellation Copernican system corona coronagraph cosmic noise cosmic rays cosmogony cosmological principle cosmology cosmos coude telescope Crab Nebula crater crescent moon cynosure

D
dark matter dark nebula declination deferent Deimos diffuse nebula dispersion Dog Star Doppler shift double star Dumbbell Nebula dust dwarf

E
Earth eccentricity eclipse eclipsing binary ecliptic ecosphere electromagnetic spectrum elliptical galaxy emission lines ephemeris epicycle epoch equant equinox ether Europa exosolar planet exosphere expanding universe extragalactic

F
fireball first point of Aries flash spectrum flocculus force field Fraunhofer lines full moon

G
galactic equator galactic noise galactic pole galaxy Galilean satellites Galilean telescope Ganymede gas giant Geiger counter Geiger-Muller tube geocentric geomagnetic axis giant stars gibbous moon globular cluster gnomon gravitation gravitational collapse gravitational lensing gravity anomaly great circle Great Wall

H
Halley's Comet halo harmonic law heavenly body heliocentric helioseismology helium Hertzsprung-Russell diagram horizon horizon system Horsehead Nebula Hubble classification scheme Hubble Space Telescope Hyades hydrogen hydrogen fusion

I
image-intensifier tube interacting galaxies intercrater plain interferometer intergalactic intergalactic medium interplanetary interplanetary medium interstellar cloud Io ionosphere irregular galaxy

J
Jovian moons Jupiter

K
Kepler's laws Kuiper Belt

L
Large Magellanic Cloud law of universal gravitation laws of motion lenticular galaxy light speed light year lines of force Little Dipper Local Group Local Supercluster luminosity lunar lunar eclipse lunar occultation

M
Magellanic clouds magnetar magnetic field magnetic star magnetosphere magnitude main sequence main-sequence major axis major planets mare Mare Imbrium Mars mascon mass spectrometry Mercury meridian Messier object metagalaxy meteor meteor shower meteorite meteoroid Milky Way minor planet Mira variable Miranda monochromator moon motion

N
nadir nebula Neptune Nereid neutron star New General Catalogue new moon Newtonian reflector Newton's law of universal gravitation Newton's laws of motion NGC no boundary condition nodes North Star Northern Lights nova nutation

O
Oberon objective observable universe observatory occultation Olympus Mons Oort cloud open cluster optical double orbit orbital velocity order of magnitude Orientale basin Orion Nebula orrery outer space outgassing

P
parallax parhelic circle parsec penumbra perigee perihelion period period-luminosity relation perturbation phase Phobos photometry photomultiplier tube photosphere planet Planet X planetarium planetary nebula planetesimal planetoid plasma plate tectonics Pleiades Pluto polar cap Polaris polestar precession primary primordial black hole Procyon proper motion protoplanet protostar Proxima Centauri Ptolemaic system pulsar pulsating universe theory

Q
quarter moon quasar quintessence quarks

R
radar ranging radial velocity radiant radio astronomy radio beam radio galaxy radio source radio star radio telescope radio wave ray red dwarf red giant red shift red supergiant reflection nebula reflector refractor regolith retrograde motion rift valley right ascension Ring Nebula ring plain ring system Roche limit

S
Saber's beads SALT satellite Saturn Saturn's rings Schmidt telescope Schwarzschild radius seeing seismometer semimajor axis SETI sextant Seyfert galaxy shepherd satellite shooting star sidereal sidereal period sidereal time signal-to-noise ratio singularity Sirius Small Magellanic Cloud sol solar solar corona solar eclipse solar flare solar nebula solar system solar wind solstice space space velocity space velocity space-time spectral type spectrograph spectroheliograph spectroscopic binary spectroscopic parallax spectroscopy spectrum spectrum-luminosity diagram spicule spiral arm spiral galaxy star star cloud starburst galaxy stargazing steady state model sun sunspot supercluster supergiant star supermassive black hole supernova supernova remnant surface temperature synodic month syzygy

T
T-Tauri telescope terra terrestrial planets Tharsis ridge tidal friction tides Titan Titania transit trinary star Triton

U
umbra Umbriel universal gravitation universe uranography uranology uranometry Uranus

V
Van Allen radiation belts variable star Venus vertical circle Very Large Array Vesta Virgo Cluster visible spectrum visual binary VLA

W
waning moon waxing moon whirlpool galaxy white dwarf white hole Widmanstatten figures waxing gibbous

X
X-ray burster X-ray

Z
zenith zodiacal light zone zone of avoidance