astrometry

noun

as·trom·e·try | \ə-ˈsträ-mə-trē

Definition of astrometry

: a branch of astronomy that deals with measurements (as of positions and movements) of celestial bodies

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Examples of astrometry in a Sentence

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Byrd explains that Gaia studies the motions of individual stars using a technique called astrometry. — Jason Daley, Smithsonian, "2.8 Million Stars Sparkle in This Incredible Image of the Milky Way," 6 Sep. 2017 Measuring these shifts, or parallaxes, lets astronomers calculate the stars’ actual positions and movements through the galaxy with great precision, a field of study called astrometry that Gaia and its predecessor Hipparcos have revitalized. — Michael Greshko, National Geographic, "New Milky Way Map Is a Spectacular Billion-Star Atlas," 14 Sep. 2016

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

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