Observing · Stars
Astrometry
Say it: uh-STROM-uh-tree IPA: /əˈstrɑmətri/ noun
Astrometry: The precise measurement of the positions and motions of celestial objects.
By tracking where a star appears over time, astronomers can separate effects such as parallax and the star's own motion. Small positional changes can reveal large physical stories.
- Example
- Repeated astrometry measured the star's motion across the sky.
- Why astronomers use it
- It supports distance measurements, orbital studies, and accurate celestial maps.
- Tiny cosmic connection
- Astrometry measures position; photometry measures received light, and spectroscopy studies its wavelength distribution.
Observatory Observing Stars
Where to check it
Written for Cool Moon Facts in its own words; the sources cover the same idea in more depth.