Astrometry ✦

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

: 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 astrometry

is the specialized branch of astronomy focused on the precise measurement of the positions and movements of celestial bodies. By establishing exact coordinates and tracking changes over time, it provides the fundamental framework for understanding the 3D structure and dynamic evolution of our universe. Core Scientific Objectives Astrometry serves two primary functions in modern science: The field has evolved from ancient naked-eye catalogs

: It provides a non-rotating stellar frame that links optical observations to other regions of the electromagnetic spectrum, such as radio waves. By establishing exact coordinates and tracking changes over