Abstract
Using recently determined absolute proper motions for the globular clusters M2 and NGC 6712 their space velocities are calculated and their galactic orbits are numerically integrated. In the case of M2 several assumptions are made about the solar apex, and the resulting differences in the parameters of the galactic orbits are discussed. The orbit of NGC 6712 is insensitive to the assumed solar apex. With the computed orbital parameters the theoretical tidal radii are determined and compared with the observed values. The effects of observational uncertainties on the computed orbits and on the tidal radii are assessed.
