An experiment analogous to that of Kennedy-Thorndike and the ammonia-beam experiment of Cedarholm, Bland, Havens, and Townes has been performed using the Mossbauer effect in Fe 57 . A Co 57 source was on the rim and an iron absorber near the center of a centifuge. The frequency shift between the rotating source and absorber was measured as a function of the angular position relative to the fixed stars. An anomalous velocity-dependent interaction of clocks with a field derived from distant matter would be expected to cause a frequency shift Av/v = 2yU'\/c 2 , where 7 is a constant, v the relative velocity of source and absorber, and u the velocity of the laboratory relative to a reference frame in which distant matter has an isotropic velocity distribution. The value of the component of 711 lying in the earth's equatorial plane was found to be 220±840 cm/sec.
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