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Countdown to pi: 3/14/15 at 9:26:53 a.m.

Mike Spillane/Globe Staff

Mathematical minds around the region will rejoice when the clock strikes 9:26:53 a.m. on Saturday. The moment marks a once-per-century occurrence, as the date (3/14) and time line up to spell out the first 10 digits of pi.

Get it? 3.141592653.

The mathematical constant, which refers to the ratio of a circle’s circumference to its diameter, gets a nod every March 14. Math groups meet annually for pie-eating contests and see how many digits they can recite from memory, but this year is extra special.