Astrometry -

: It provides a non-rotating stellar frame that links optical observations to other regions of the electromagnetic spectrum, such as radio waves.

The field has evolved from ancient naked-eye catalogs to high-precision space observatories that bypass atmospheric distortion. astrometry

: Measurements of position, parallax (distance), and proper motion (drift across the sky) allow astronomers to calculate stellar mass, luminosity, and spatial distribution within the Milky Way . Key Technologies & Missions : It provides a non-rotating stellar frame that