CORRECTIONS TO THE IAU-1976 PRECESSION CONSTANT AND THE COEFFICIENTS OF THE IAU-1980 NUTATION SERIES FROM VLBI OBSERVATIONS

In the aspect of examination by observations and based on a longer dat a span and improved precision of very-long baseline interferometry obs ervations, the corrections to the IAU 1976 precession constant and the coefficients of IAU 1980 nutation series are solved. The corrections to coefficients of long periodic terms, the detection of the retrograd e free core nutation, and the possible relation between the correction s to coefficients of the prograde annual term and the enviromental tem perature are also briefly discussed.