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इन्हें भी देखें[संपादित करें]
- Modern Astrometry, Jean Kovalevsky, pp. 1, Springer, 2002, ISBN 978-3-540-42380-5, ... Astrometry is the part of astronomy that provides the positions, and by extension, the dimensions and the shapes of the celestial bodies. These quantities generally vary with time so that the primary goal of astrometry is to describe their motions ...