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1.2411 trillion digits (1,241,100,000,000) digits of pi have been dicovered.
Pi is first known to have been estimated in ancient Babylon about 4000 years ago. It was also used in ancient Egypt, and was discovered in India over 2000 years ago and China about 1500 years ago.
Every person who has ever used the "value" of pi in a calculation has used an approximation.