Abstract
In this paper, it is pointed out that if the spiral galaxies as a whole revolve about some common centre, the rotation curve will be changed by the kinematic effects. The common centre could be the centre of a supercluster or the centre of dark matter and luminous matter.The kinematic effects on the rotation curve are calculated. The additional velocity caused by revolution about the common centre is obtained. The 44 rotation curves of Sb and Sc galaxies are expressed by means of a linear least squares fit, from which the period of velolution and the ratio of tidal force to self-gravitating force are estimated for every galaxy in extreme cases. Finally, the measurement on two dimensional rotation curve is suggested to pick out the kinematic effects of revolving.
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