Today is the most magical day of the year: Pi Day.

Itâ€™s also the most magical year of the century: Pi Year.

That is, todayâ€™s date is 3/14/15 (at least in the US and a few other countries that write dates the same way), which matches up nicely with the first five digits of pi, the ratio of every circleâ€™s circumference to its diameter: 3.1415.

Whatâ€™s more, at precisely 9:26:53 am, weâ€™ll have Pi Second: an even more magical time at which the date and time match up with the first 10 digits of pi, 3.141592653.

But it doesnâ€™t stop there. As University of Toronto statistician Jeffrey S. Rosenthal has pointed out, at an infinitesimally brief moment just after 9:26:53.58979 am but slightly before 9:26:53.5898 am, weâ€™ll have Pi Instant.

At this impossibly short moment, our particular civilizationâ€™s way of marking the amount of time elapsed since an arbitrary dateâ€¦

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