FIRST POST-NEWTONIAN ANGULAR-MOMENTUM IN RELATIVISTIC CELESTIAL MECHANICS

With a new theory on the 1PN celestial mechanics recently developed by Damour, Soffel and Xu (1991,1992,1993,1994), definitions and expressi ons of the 1PN spin angular momentum are investigated and analysed. Th e total spin angular momentum of a system of extended bodies such as t he solar system is calculated and expressed as the function of local p arameters and observables under reasonable assumptions, which would fi nd its application in the evolution and dynamics of systems of celesti al bodies.