To Build Up the Inertial Coordinate System with A CCD (Ⅳ) The Transition to the Inertial Coordinate System

In this article, the kinematic and dynamic methods for setting up the inertial coordinate system are simply described. And the geometrical method is described in detail, namely, when extragalactic systems are used as the fixed reference points to form a reference frame, the precessional rotation of the fundamental catalogue system is derived through the determination of the absolute proper motions of some stars. The CCD measurements are also compared with the photographic measurements, and the conclusion is that the inertial coordinate system with higher accuracy can be set up by the overlap exposure measurements obtained with a CCD.