Abstract
Through what angle will a part of the Galaxy turn during the time its light takes to reach the observer (r/c years)? D = K (v/R)r, where v is the rotational velocity in km/sec of a point in the Galaxy at a distance R kpc from the galactic center seen at a distance r kpc from the sun. K is a conversion factor equal to 1.92 X 10-~. Constants entering the calculation of K were 3.16X 10~ sec/yr, 3.26x10i yr/kpc, 57.3 deg/rad, and 3.09X10'6 km/kpc. Values of v/R were taken from M. Schmidt's model of the Galaxy (Bull. Astron. Inst. Neth. 468, June 1956). The values of D were computed graphically for various values r and v/R, and galactic loci of equal angles were found. Since the maximum value of D is less than half a degree (occurring near the galactic center) the effect is completely negligible with the present resolving power of radio telescopes used in galactic research.
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