Short Communication
Mathematical Modeling, Numerical Methods and Software Complexes

Modeling Chandler and annual polar motion with account for lunar orbit precession

S. S. Krylov, Z. A. Myo, V. V. Perepelkin

Moscow Aviation Institute (National Research University), Moscow, 125993, Russian Federation

Abstract: This study examines the effect of lunar orbit precession (18.6-year period) on the principal components of Earth's polar motion—the Chandler wobble and annual wobble. We develop an enhanced polar motion model incorporating additional terms to represent long-period lunar disturbances. Numerical simulations show that accounting for these perturbations in an autonomous, uncorrected model enhances polar position determination accuracy by approximately 5 cm on average.

Keywords: Earth rotation modeling, polar motion, lunar perturbation, Chandler wobble

UDC: 517.958:[531.391+521.93+521.172]

MSC: 70F15, 70K40

Received: March 1, 2025
Revised: May 27, 2025
Accepted: June 4, 2025
First online: July 14, 2025

DOI: 10.14498/vsgtu2168

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