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We investigate periodicities in redshift samples corrected for the apparent motion of the solar system relative to the cosmic background radiation. Referred to a coordinate system at rest with respect to the CBR, a sample of precise 21 cm data is periodic at 72.1 km s$^{-1}$ at a very high significance level, at least 99.99\% formally. A search for periodicities in a large volume of velocity space shows other, random periodicities at a level consistent with the fact that the coincidence with the CBR rest frame is a very improbable occurrence.
The sample used for the initial discovery is composed of data taken by Tifft and Tifft and Cocke at the 300-ft and 140-ft telescopes at Green Bank. Other data confirm the correspondance with the CBR rest frame; namely, 21 cm data by Giovanelli and Haynes and by Fisher and Tully. The former data set was analysed for galaxies with very wide 21 cm profiles and is periodic at 36.05 km s$^{-1}$. The joint probability for all these coincidences is hard to evaluate, but is certainly $< 10^{-6}$. Power spectrum analysis confirms the high significance levels and the precise correspondance with previously predicted periods.
