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

astrometric

ˌa-strə-ˈme-trik 

adjective

Examples of astrometry in a Sentence

Recent Examples on the Web

Hyperia then automatically slews to the target and performs an operation called astrometry – measuring the precise positions of stars to double-check its accuracy. —New Atlas, 26 Jan. 2026

Gaia, however, is the most sensitive astrometric survey ever performed and will dramatically increase the number of exoplanets found through astrometry. —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

But recently, astronomers were able to combine astrometry and direct imaging together and find an exoplanet. —Jackie Appel, Popular Mechanics, 6 May 2023

Gaia is only the second space telescope dedicated to astrometry, the measurement of stellar distances. —Rachel Courtland, IEEE Spectrum, 18 Dec. 2013

Word History

Etymology

astro- + -metry

First Known Use

1811, in the meaning defined above

Rhymes for astrometry

• cytometry
• geometry
• isometry
• manometry
• morphometry
• optometry
• photometry
• spectrometry
• spirometry
• thermometry
• anthropometry
• audiometry