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Z redshiftAstronomers calculate red or blue shift values by the following formula: ( f_{emitted} – f_{observer} ) / f_{observer} Where f_{emitted} is the frequency of the emitted radiation f_{observer} is the frequency of unshifted radiation seen by the observer
The following table gives the approximate equivalence between Z and the age after the Big Bang. The figures were obtained using Ned Wright’s Cosmology Calculator using the values Ho = 71, OmegaM = 0.270, Omegavac = 0.730 assuming a flat universe.
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