Abstract
The retardation equation for straight line signal propagation is solved analytically for the two-dimensional case and used to plot the retarded positions graphically for a variety of particle distributions moving relatively to the observer. The results show that in case of a finite signal propagation speed the observed particle distribution must appear as expanded/compressed if it moves towards/away from the observer. The apparent change of scale of the distribution goes hereby along with an inverse change in particle density.
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