astrometry
/əˈstrɑmətri/
noun
- The branch of astronomy that deals with measuring the positions and movements of stars and other celestial bodies.
- The ancient Greeks practiced a simple form of astrometry by mapping the night sky with their eyes.
- Astrometry helps scientists track the orbits of asteroids that might come near Earth.
- Using astrometry, astronomers can detect planets around distant stars by measuring tiny shifts in the star's position.