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Astrometry, as a part of cosmology, involves the precise measurement of positions and movements of celestial objects. It is a branch of observational astronomy that focuses on determining the six-degree positional parameters of various celestial bodies such as stars, galaxies, and planets. Astrometry employs techniques from physics, mathematics, and computer science to analyze and interpret data obtained through telescopic observations. By measuring the positions and motions of celestial objects, astrometrists can help answer fundamental questions about the structure, evolution, and dynamics of our universe.