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NASA only uses about 15 digits of pi for calculating interplanetary travel.
With 40 digits, you could calculate the circumference of a circle the size of the visible universe with an error smaller than the diameter of a hydrogen atom.
Is this true?
To calculate the circumference, you simply multiply the diameter by pi. So the margin of error comes from the error in pi multiplied by the size of the universe. The observable universe is about 93 billion light years across. In meters, that is a number with about 26 zeros.
A hydrogen atom, on the other hand, is about a decimal with 10 zeros. The difference in scale between these two is roughly 36 orders of magnitude.
Each extra digit of pi gives about one more decimal place of precision. So you only need around 36 digits of pi for this level of accuracy. Using 40 digits is more than enough.

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