Ok, I feel like an idiot, but can someone remind me how you prove mathematically z = v/c? (z is redshift, v is recessional velocity, c is speed of light.)(adsbygoogle = window.adsbygoogle || []).push({});

I realise that this equation only works in a non-relativistic Universe, but nevertheless I'd like to see it.

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# Prove that z=v/c

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