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We have studied the influence of an evolving gravitational potential of theMilky Way Galaxy on the orbital motion of 152 globular clusters with propermotions from the Gaia EDR3 catalogue and mean distances from Baumgardt andVasiliev (2021). To construct a semicosmological evolving model potential withchanging masses and sizes of the Galactic components, we have used thealgorithm described in Haghi et al. (2015). The adopted axisymmetricthree-component model potential of the Galaxy includes a spherical bulge, aflat Miyamoto--Nagai disk, and a spherical Navarro--Frenk--White dark matterhalo.The orbits are integrated backward in time. We compare the orbitalparameters of globular clusters derived in static and evolving potentials whenintegrating the orbits for 5 and 12 Gyr backward. For the first time we havestudied the influence of separately a change in the masses and a change in thesizes of the Galactic components. The changes in the masses and sizes of thecomponents are shown to act on the orbital parameters in the opposite way. Atsmall Galactocentric distances this influence is maximally compensated for. Theorbits of distant globular clusters and those with a large apocenter distanceundergo the biggest changes. We show that on time scales up to $-5$~Gyr theorbits of globular clusters in the case of a potential with both changingmasses and changing sizes of the components undergo, on average, minor changescompared to the case of a static potential. These changes fit into the limitsof the statistical uncertainties caused by the errors in the data. So, on thesetime scales the Galactic potential may be deemed static. We provide tables withthe orbital parameters of globular clusters derived in both static and evolvingpotentials.

Study of the Influence of an Evolving Galactic Potential on the Orbital Properties of 152 Globular clusters with Data from the Gaia EDR3 Catalogue