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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The constellation, dubbed Capella, is a brainchild of Seoul National University astronomy professor Sascha Trippe. Tereza Pultarova, Space.com, 4 Jan. 2025 Known as the world’s first International Dark Sky City, Flagstaff is famous for its astronomy heritage. Tiffany Acosta, The Arizona Republic, 3 Jan. 2025 The first program, Winter Stars, will begin at 1:30 p.m. and will be led by Mike Ryan, Trout Lake’s astronomy expert. Orlando Sentinel Staff, Orlando Sentinel, 3 Jan. 2025 For this reason, premodern astrology was closely connected to astronomy. Michelle Aroney and David Zeitlyn, Smithsonian Magazine, 2 Jan. 2025 See all Example Sentences for astronomy 

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 18 Jan. 2025.

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

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