as·​tron·​o·​mer | \ ə-ˈsträ-nə-mər How to pronounce astronomer (audio) \

Definition of astronomer

: a person who is skilled in astronomy or who makes observations of celestial phenomena

Examples of astronomer in a Sentence

Recent Examples on the Web Stephan’s Quintet, named for the 19th-century French astronomer who discovered them, is a cluster of galaxies about 290 million light-years away. Marina Koren, The Atlantic, 8 July 2022 For example: Margaret Landis, 30, is an astrophysicist who collects texts related to the cometary discoveries of Maria Mitchell, the first female astronomer in the United States. New York Times, 7 May 2022 Lots of big numbers, nearly of the magnitude astronomer Carl Sagan used to ponder. Kevin Paul Dupont,, 2 Apr. 2022 Remarkably this asteroid was discovered by the same astronomer that found 2022 EB5 a few weeks ago just hours before its impact. Jamie Carter, Forbes, 26 Mar. 2022 The first star map can be traced back to the Greek astronomer and mathematician Hipparchus around 129 BC. Lucie Green, Wired, 15 Dec. 2021 Franck Marchis, senior planetary astronomer at the SETI Institute, said the asteroid is traveling at roughly 30,000 mph – 17 times the speed of a bullet. Laura L. Davis, USA TODAY, 23 May 2022 One team, led by astronomer Kailash Sahu, a Hubble instrument scientist at the Space Telescope Science Institute in Baltimore, determined that the black hole weighed seven times the mass of our sun. Ashley Strickland, CNN, 14 June 2022 It’s the equivalent to a person eating a single grain of rice over millions of years, another astronomer said. Seth Borenstein, The Christian Science Monitor, 13 May 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'astronomer.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of astronomer

14th century, in the meaning defined above

Buying Guide

A love for education starts at an early age. The Reviews team researched the best science toys for kids to jumpstart their learning.

Learn More About astronomer

Time Traveler for astronomer

Time Traveler

The first known use of astronomer was in the 14th century

See more words from the same century

Dictionary Entries Near astronomer



astronomer's staff

See More Nearby Entries 

Statistics for astronomer

Last Updated

5 Aug 2022

Cite this Entry

“Astronomer.” Dictionary, Merriam-Webster, Accessed 8 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for astronomer


as·​tron·​o·​mer | \ ə-ˈsträ-nə-mər How to pronounce astronomer (audio) \

Kids Definition of astronomer

: a person who is a specialist in astronomy

More from Merriam-Webster on astronomer

Nglish: Translation of astronomer for Spanish Speakers

Britannica English: Translation of astronomer for Arabic Speakers


Test Your Vocabulary

Challenging Words You Should Know

  • hedgehog reading a book
  • Often used to describe “the march of time,” what does inexorable mean?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!