astrometry
noun
as·trom·e·try
ə-ˈsträ-mə-trē 
: a branch of astronomy that deals with measurements (as of positions and movements) of celestial bodies
Examples of astrometry in a Sentence
Recent Examples on the Web
Gaia, however, is the most sensitive astrometric survey ever performed and will dramatically increase the number of exoplanets found through astrometry.
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Keith Cooper, Space.com, 8 Oct. 2025
At the heart of Gaia’s mapmaking is a technique called astrometry, the measurement of celestial positions and motions in the plane of the sky.
—Lee Billings, Scientific American, 18 June 2025
There’s astrometry, where scientists look for how an exoplanet causes a host star to move in relation to other stars.
—Jackie Appel, Popular Mechanics, 6 May 2023
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Keith Cooper, Space.com, 8 Oct. 2025
At the heart of Gaia’s mapmaking is a technique called astrometry, the measurement of celestial positions and motions in the plane of the sky.
—Lee Billings, Scientific American, 18 June 2025
There’s astrometry, where scientists look for how an exoplanet causes a host star to move in relation to other stars.
—Jackie Appel, Popular Mechanics, 6 May 2023
Cite this Entry
“Astrometry.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/astrometry. Accessed 31 Oct. 2025.
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