Astronomers calculate red or blue shift values by the following formula:
( femitted – fobserver ) / fobserver
Where femitted is the frequency of the emitted radiation
fobserver 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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