Cách sử dụng
Astrometry is a word that refers to the measurement of the positions and motions of celestial objects like stars and planets. It is often used in astronomy, the study of the universe and the objects within it. Astronomers use astrometry to map the sky, track the movement of celestial bodies, and calculate their distances from Earth. So, astrometry is the science that measures the positions and movements of objects in the sky.