Abstract
The influence of the dynamic effects of the Earth-Moon system spatial motion on the perturbed Chandler wobble of the Earth pole is studied on the basis of the celestial mechanical approach and the analysis of astrometric data of observations of International Earth Rotation and Reference Systems Service. The additional harmonic of the oscillatory process with a frequency close to the Chandler frequency is determined. It is shown that the found harmonic leads to variations in the Chandler wobble amplitude with a period of about 40 years.
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