On lambda and omega measurements and acceleration of universe expansion
  Luminisity distances to the high-redshift Ia supernovas measured by the Supernova Cosmology Project team with the relativistic correction factors for redshift and time dilation led to the sensational conclusion about acceleration of universe expansion. The effect of relativistic aberration of high-redshift sources requires an additional correcting factor for the observed luminosities of SN Ia supernovas which can reduce the data to fit the universe with lambda = 0, i.e. without acceleration. 
O. G. Semyonov