"Astrometrics" . "astrometricist" . "observation" . . . "astrometric measurements" . . . . "precise position" . "astrometrically" . . . . . "astrometric" . "Astrometry" . . . "measure the positions of stars" . "observations" . . . "changes in its position in the sky" . "astrometrist" . "astronomical" . "astrometric positions" . . "Radar astrometry" . . . . "Stellar statistics" . . "astrometrics" . . . . . "Astrometric stations" . . . . "positional observations" . "astrometric observations" . . . "astronomical observations" . . "Astrometric observatory" . "astrometry#History" . "astrometrical" . . . . . "astrometic" . "astronometric measurements" . . "Astrometric" . "astrometry" . . "astrometric science" . . . . "position" . . . "Astrometry" . "astronomy" .