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Astronomy has 18 categories.

Archaeoastronomy
Astrodynamics
Astronomers
Astronomical catalogues
Astronomical images
Astronomical objects
Astronomical observatories
Astronomy images
Astronomy people

Astrophysics
Calendars
Celestial coordinate system
Celestial dynamics
Celestial mechanics
Comets visited by spacecraft
Large-scale structure of the cosmos
Planetology
Pythagorean philosophy

Astronomy has 183 articles.

Aberration of light	Absolute magnitude	Adaptive optics
Afocal projection	Almucantar	Amateur astronomy
American Astronomical Society	Analemma	Angular diameter
Apache Point Observatory Lunar Laser-ranging Operation	Aperture synthesis	Apparent magnitude
Apsis	Association of Universities for Research in Astronomy	Asterism (astronomy)
Astroarcheology	Astrochemistry	Astrology and astronomy
Astrometric binary	Astrometry	Astronomer Royal
Astronomical algorithm	Astronomical distance	Astronomical League
Astronomical naming conventions	Astronomical opposition	Astronomical Society of Southern Africa
Astronomical Society of the Pacific	Astronomical spectroscopy	Astronomical units of length
Astronomy	Astronomy and Astrophysics	Astronomy Common Object Model
Astrophotography	Astrophysics	Asymptotic Giant Branch
Autumnal equinox	Axial tilt	B1900.0
B1950.0	Background (astronomy)	Barycenter
BATTeRS	Bayer designation	Besselian epoch
Binary star	Binary system (astronomy)	Black drop effect
Blue shift	Bok globule	British Astronomical Association
Campaign for Dark Skies	Celestia	Celestial body atmosphere
Celestial sphere	Cepheid variable	CERGA
Clickworkers	Compton effect	Conjunction (astronomy)
Contact binary	Coronagraph	Correlation function (astronomy)
Declination	Deep sky	Detached binary
Ecliptic	Ecliptic longitude	Ephemeris
Epoch (astronomy)	Equinox	Extraterrestrial skies
Fingers of God	Frame of reference	Galactic astronomy
Galaxy classification	Gamma ray burst	Gamma-ray astronomy
Gaussian year	Gravitational binding energy	Gravitational lens
Great year	Group 70	Guide star
Guide Star Catalog	Guinness book of Astronomy	Heliosphere
Henry Draper Catalogue	Hertzsprung-Russell diagram	Horizontal branch
Horn (telescope)	Horseshoe orbit	Hubble flow
Hubble sequence	Infrared astronomy	Institute of Astronomy, Cambridge
International Astronomical Union	International Earth Rotation and Reference Systems Service	IUCAA
J2000.0	James Craig Watson Medal	Jansky
JPL Horizons Ephemeris System	Julian day	Julian epoch
Julian year	Kelvin-Helmholtz mechanism	Kennedy-Thorndike experiment
Kopernik Space Center	Laplace plane	Large-scale structure of the cosmos
Light curve	Light day	Light hour
Light minute	Light month	Light second
Light week	Light-time correction	List of astronomical topics
Longitude of the ascending node	Lorentz-Fitzgerald contraction hypothesis	Low-mass X-ray binaries
Luminosity	Lunar distance	Lunar Laser Ranging Experiment
Lunar node	Messier marathon	Metonic cycle
Michelson-Morley experiment	Monthly Notices of the Royal Astronomical Society	Nadir
Naked eye	Night	Oblate
Observational astronomy	Occultation	Parsec
Peak of Eternal Light	Photometry (astronomy)	Planet-Crossing Asteroid Survey
Planetarium	Planetary nebula	Planetary orbit
Polar distance	Polar motion	Positional astronomy
PPARC	Precession	Proper motion
Protogalaxy	Protoplanetary disc	Radar astronomy
Radio astronomy	Radio telescope	Rare Earth hypothesis
Redshift	Rotation-powered pulsar	Royal Astronomical Society
Schwarzschild wormholes	Seeing disk	Semidetached binary
Sidereal time	Solar azimuth angle	Solar elevation angle
Solar radiation pressure	Space observatory	Spectroscopic binary
Star catalogue	Star designation	Stellar astronomy
Stellar classification	Sunrise	Sunset
Swift Gamma-Ray Burst Mission	Timeline of white dwarfs, neutron stars, and supernovae	TRGB
Twinkling	Variable star designation	Virgo cluster
Welteislehre	X-ray astronomy	Zenith

Categories: Dewey Decimal Classification 52 | Science | Space