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Astronomers 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.

Z |
After Big Bang |

1089 |
380,000 |

28.62 |
108 my |

28 |
112 my |

27 |
118 my |

10 |
482 my |

8.6 |
600 my |

5 |
1.2 gy |

4 |
1.57 gy |

3 |
2.2 gy |

2 |
3.3 gy |

1 |
6 gy |

0.5 |
8.6 gy |

0 |
13.7 gy |

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