Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Astrometry is the branch of astronomy that relates to precise measurements and explanations of the positions and movements of stars and other celestial bodies. Although once thought of as an esoteric field with little useful application for the future, the information obtained by astrometric measurements is now very important in contemporary research into the kinematics and physical origin of our Solar System and our Galaxy, the Milky Way.The history of astrometry is linked to the history of star catalogues, which gave astronomers reference points for objects in the sky so they could track their movements

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