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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Other Words from astrometry

astrometric \ ˌas-​trə-​ˈme-​trik \ adjective

Examples of astrometry in a Sentence

Recent Examples on the Web

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.

First Known Use of astrometry

1811, in the meaning defined above

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The first known use of astrometry was in 1811

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