Proper motion field of QSO-like objects induced by the centripetal galactic acceleration. There is no effect in the directions of the galactic centre and anti-centre, and amaximum in the plane passing through the galactic poles with nodes at 90–270° in galactic longitudes. The plot is in galactic coordinates with the Solar System at the centre of the sphere, and the vector field seen from the exterior of the sphere. Orthographic projection with viewpoint at l = 30°, b = 30° and an arbitrary scale for the vectors. See also an online movie.