Technique · Astrometry & Motion
Proper Motion
The slow drift of a star across the sky over years, as it and the Sun move through the galaxy. Combined with radial velocity and distance, it yields a star's true motion through space.
Astrometry & MotionMeasures: A star's motion across the sky
Builds on
Knowledge connections
- Member of groupAstrometry & Motion
- Associated withGaia
- Associated withThe Equatorial Coordinate System
- Associated withEarth Orientation Parameters
Sources
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
- ESAEuropean Space Agency
European missions, observatories, and space science imagery.