Students from the Maurice J. Tobin School makes a human Pi symbol at the school in Boston during a celebration of Pi Day, March 13, 2007 (AP Photo/Chitose Suzuki, File)

Going full circle on a special Pi Day

Saturday is 3-14-15, the first five digits of the mathematical constant pi: 3.141592653. The best times to celebrate are at 9:26 and 53 seco…