Pi Day Is Especially Remarkable This Year

It's a big day for math lovers—even bigger than your typical Pi Day. The event is celebrated on March 14, or 3/14, each year in honor of the number, whose first digits are 3.14. But a single second this year marks a once-in-a-century occurrence that covers the first 10 digits of the number, PBS NewsHour reports. Those digits are 3.141592653. So watch your clock for the moment when it's 3/14/15 at 9:26:53am, and celebrate alongside pi fans everywhere.

The New York Times reports on a few of those celebrations: Pi Day officially began in San Francisco, and you can visit the city's Exploratorium for lectures, a procession, and various kinds of pie. And applicants to MIT will be waiting with bated breath for 9:26am, when they find out whether they've been accepted. (Meet the girl who's memorized more than 2,300 digits of pi.)