astronomy

noun

as·​tron·​o·​my ə-ˈsträ-nə-mē How to pronounce astronomy (audio)
plural astronomies
: the study of objects and matter outside the earth's atmosphere and of their physical and chemical properties

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The Difference Between Astronomy and Astrology

Some may find it easy to confuse astronomy and astrology. At one time, these two words actually were synonymous (that is, astronomy once meant what astrology means today), but they have since moved apart from each other. In current use, astronomy is concerned with “the study of objects and matter outside the earth's atmosphere,” while astrology is the purported divination of how stars and planets influence our lives. Put bluntly, astronomy is a science, and astrology is not.

Examples of astronomy in a Sentence

Recent Examples on the Web Ko is a doctoral student of astronomy at the University of Tokyo. Jacopo Prisco, CNN, 13 Aug. 2024 The Perseid meteor shower has already begun, but the peak time to watch it in the U.S. is the night of Aug. 11-12, says Alex Filippenko, a distinguished professor of astronomy at the University of California, Berkeley. Chantelle Lee, TIME, 6 Aug. 2024 George Mason University astronomy professor Peter Becker narrows a time frame down further. Jeanine Santucci, USA TODAY, 26 July 2024 Lee Billings is a science journalist specializing in astronomy, physics, planetary science, and spaceflight, and is a senior editor at Scientific American. Lee Billings, Scientific American, 26 July 2024 See all Example Sentences for astronomy 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'astronomy.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

Middle English astronomie "study of celestial bodies, including their possible influence on human affairs," borrowed from Anglo-French & Latin; Anglo-French astronomie, borrowed from Latin astronomia, borrowed from Greek astronomía "study of the stars, especially their movements," from astro- astro- + -nomia -nomy

First Known Use

12th century, in the meaning defined above

Time Traveler
The first known use of astronomy was in the 12th century

Dictionary Entries Near astronomy

Cite this Entry

“Astronomy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/astronomy. Accessed 19 Aug. 2024.

Kids Definition

astronomy

noun
as·​tron·​o·​my ə-ˈsträn-ə-mē How to pronounce astronomy (audio)
plural astronomies
: the science of the heavenly bodies and of their sizes, motions, and composition
astronomer
-mər
noun

More from Merriam-Webster on astronomy

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