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The first ten digits of pi rounded up 3.141592654 seemed a lot more useful during undergrad.
According to some, 37/38 decimal places is where additional information, even at cosmic scale, becomes fairly useless.
At 15 decimal places, you can calculate a circle from Earth around the Voyager 1 probe, and find the circumference with an error of about half an inch. (About 15 billion miles/24 billion km in radius)
So to say you need even 9 decimal places of precision while using pi for anything on earth, would be excessive.
I'll take your 9, and raise you to 26.
3.14159265358979323846264338...
If you want to bump it up to 29 digits (the next digits being 327, not rounded), there's always this old gem
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