A Method of Prediction for Polar Movement

Abstract

It is unavoidablly necessary at present to know in advance the longitude variation due to polar movement, for precise time service and for some other researches. In order to get the predicted values of x and y for one year from the results which were obtained by observation during the preceding several years, a method of calculation is proposed which, is obtained by a synthetic treatment in vector representation under an assumption that both amplitude and phase in the Chandler component and those in the annual one are almost constant during the years in question. An application of the method to a series of known data proved a pretty satisfactory prediction.