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
Impact probability To see whether an approaching object could hit Earth, researchers find out what an asteroid’s orbit looks like using a technique called astrometry.
—
Toshi Hirabayashi, Space.com, 23 July 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
To map these stars, astronomers use astrometry — measuring the precise positions of stars.
—Liz Kruesi, Discover Magazine, 23 Sep. 2016
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Toshi Hirabayashi, Space.com, 23 July 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
To map these stars, astronomers use astrometry — measuring the precise positions of stars.
—Liz Kruesi, Discover Magazine, 23 Sep. 2016
Cite this Entry
“Astrometry.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/astrometry. Accessed 9 Sep. 2025.
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