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Refined astrometry measurements allow us to detect large-scale deviationsfrom isotropy through real-time observations of changes in the angularseparation between sources at cosmic distances. This "cosmic parallax" effectis a powerful consistency test of FRW metric and may set independentconstraints on cosmic anisotropy. We apply this novel general test to LTBcosmologies with off-center observers and show that future satellite missionssuch as Gaia might achieve accuracies that would put limits on the off-centerdistance which are competitive with CMB dipole constraints.

Cosmic Parallax: possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurements