Note that this approach is geographically limited to America -- almost like a solar eclipse (which is coming up, too, on March 20). For the rest of the world that used dd-mm-yy notation, pi day would be 3/1/41 or 3/1/42, i.e., January 3 of 2041 or 2042, depending on whether you are willing to round or truncate your pi. That's some quarter century to go. Another possible choice of the divider, 31/4, is April 31, which does not exist even in the weirdest and the leapest of all possible years of a calendar. Of course if one is willing to consider rational approximations to pi, then the International Pi day could be July 22 (22/7), although that is a far less obvious choice than the American 3/14.
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Stanislav Kolenikov
Principal Survey Scientist
Abt SRBI
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