Astrometry is a branch of astronomy that deals with measuring the positions, distances, and motions of stars and other celestial bodies. Synonyms for astrometries include celestial mechanics, celestial navigation, and celestial surveying. This field is essential for understanding the structure and evolution of the universe. Additional synonyms for astrometry-related terms are parallax (the apparent shift in an object's position caused by a change in the observer's position), proper motion (the apparent motion of a star across the sky), and distance modulus (a measure of the distance to a celestial object). Scientists and astronomers use these terms to study and gather information about the cosmos and better understand our place in it.