Definition of astrometry in English:



  • [mass noun] The measurement of the positions, motions, and magnitudes of stars.

    • ‘One technique, known as astrometry, involves precisely measuring the position of a star.’
    • ‘In this way, astronomers will perform very precise astrometry to detect the reflex motion of stars due to orbiting planets.’
    • ‘The main branches are astrometry, celestial mechanics, and astrophysics.’
    • ‘And while methods such as photometry and astrometry, which hold great promise in the long term, are still being perfected, other innovative approaches are already yielding results.’
    • ‘This method, known as astrometry, is the oldest planet-hunting method, but no planets have yet been found based on it alone.’