I just saw a post saying NASA had calculated the universe to one hydrogen atom using 40 digits of Pi, I’m aware Pi is a very important number but how does it help us to work out distances etc?
TIA
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You are misunderstanding that statement. It says that _**if** we know the diameter of the universe, **then** 40 digits of pi suffice to calculate the circumference within a single hydrogen atom_.
There is no implication of measuring actual distances or sizes with pi. It all boils down to the universe being about 40 orders of magnitude (that is: a factor of about 10^^40 ) larger than a hydrogen atom.
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