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The Local Groups motion relative to the CMB is said to be around 700 km/s. I would have thought there would be no motion relative to the rest frame of the CMB, and instead expected it to be at a constant distance regardless of motion. Do we have to factor in the speed at which the CMB is receding away from us to account for this dipole? For example, if the recession velocity is just under the speed of light, or 0.9999983 c, this motion then becomes observable?