Revolution in astrometry on the border of XX–XXI centuries was a result of technical progress in equipment and methods of observations. Since that time radio system ICRF was established as the main reference frame for astrometry and sciences connected with it, e. g. geodesy and gravimetry. During previous 300 years stars were used as a reference points and close ties (unity) between the sciences based on observations, which used vertical lines in observatories and geodetic points as referent directions. Was achieved we consider this very useful empirical tie between the three branches of the one indivisible science should be maintained. There are some difficulties in connecting geodetic and gravimetric results with radiosky.