the scientific study of the individual celestial bodies (excluding the earth) and of the universe as a whole. Its various branches include astrometry, astrodynamics, cosmology, and astrophysics
WordReference Random House Learner's Dictionary of American English © 2025
as•tron•o•my /əˈstrɑnəmi/USA pronunciation
n. [uncountable]
WordReference Random House Unabridged Dictionary of American English © 2025- Astronomythe science that deals with the moon, planets, stars, and the universe beyond earth.
as•tron•o•my
(ə stron′ə mē),USA pronunciation n.
- Astronomythe science that deals with the material universe beyond the earth's atmosphere.
- Greek. See astro-, -nomy
- Latin astronomia
- Anglo-French)
- Middle English astronomie (1175–1225
Collins Concise English Dictionary © HarperCollins Publishers::
'astronomy' also found in these entries (note: many are not synonyms or translations):
-nomy
- Almagest
- Arecibo Observatory
- CO
- Greenwich Mean Time
- Holy Grail
- Hoyle
- Huggins
- Jeans
- Jodrell Bank
- Kepler
- Maya
- National Radio Astronomy Observatory
- Nuffield Radio Astronomy Laboratories
- Poincaré
- Ptolemaic
- Ptolemaist
- Ryle
- Sylvester II
- Uranian
- X-ray
- X-ray astronomy
- Yagi aerial
- alchemy
- aperture synthesis
- archaeoastronomy
- astr.
- astrochemistry
- astrolabe
- astrology
- astrometry
- astron.
- astronomer
- astronomical
- astronomical unit
- astrophysics
- azimuth
- botany
- celestial mechanics
- chronograph
- co-
- cosmography
- cosmology
- counterearth
- depression
- dip
- epicycle
- gamma-ray astronomy
- hard science
- infrared astronomy