Circle your calendar--once-in-a-century day coming this weekend

March 13, 2015 9:58 PM

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(ABC NEWS) -- Circle around, math fans. There's a once-in-a-century Pi Day coming this weekend.

The day that celebrates the mathematical constant pi is Saturday. And because it's 2015, this particular sequence of numbers in the calendar that matches pi -- 3/14/15 -- won't come around for another century.

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