Difficulties were recognized, which led to these being in turn superseded in the 1990s by time scales Terrestrial Time (TT), Geocentric Coordinate Time GCT(TCG) and Barycentric Coordinate Time BCT(TCB).
к новым шкалам Земного времени TT, Geocentric Coordinate Time GCT (TCG) и Barycentric Coordinate Time BCT (TCB).