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 For those of us who don't remember astronomy, that means the moon will pass between the sun and the earth, completely blocking it. Margaux Anbouba, Vogue, 4 Apr. 2024 Now a student at a major research university, he’s been channeling this interest into the study of physics and astronomy. Leslie Camhi, Travel + Leisure, 30 Mar. 2024 How an eclipse can inspire a career in the sciences Thomas Hockey, a professor of astronomy at the University of Northern Iowa, remembers his first eclipse experience fondly. Lee V. Gaines, NPR, 25 Mar. 2024 Bradley Schaefer, a professor astronomy at Louisiana State University in Baton Rouge, said in most pre-modern cultures, the sun god was among the most powerful deities in the pantheon. Marc Ramirez, USA TODAY, 23 Mar. 2024 Jay Ryan, an astronomy enthusiast and a writer, remembers being 8 years old in 1970, when an eclipse traveled up the Eastern Seaboard. Marina Koren, The Atlantic, 21 Mar. 2024 The celestial phenomenon is said to be a beautiful sight, but will astronomy lovers and visitors to Kentucky actually be able to see it? Marina Johnson, The Courier-Journal, 4 Apr. 2024 So there's going to be a lot of astronomy and science, which is great for nerds like me who love that. Dana Taylor, USA TODAY, 29 Mar. 2024 In addition to being a highly respected educator, renowned for his deep knowledge of astronomy from both an Indigenous and a Western approach, Buck is an elder and ceremonial leader for the Cree, one of Canada’s largest First Nations groups. Lise Pedersen, Variety, 15 Mar. 2024

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 25 Apr. 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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