How can you define time elapsed from the Big Bang if time is local?

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Chewz
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I may be simplifying but if the universe is spacetime and time is local how can you define a time elapsed from the big bang for the whole Universe?
 
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Hi, Chewz,

Welcome to PF!

That's a good question, and Marcus has written up a nice answer to it as part of our cosmology FAQ: https://www.physicsforums.com/showpost.php?p=3332515&postcount=7

-Ben
 

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