Why was 2015 a special year for Pi Day and when did it officially begin?

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Celebrated in countries that follow the month/day (m/dd) date format, because the digits in the date, March 14 or 3/14, are the first three digits of π (3.14), Pi Day was founded by Physicist Larry Shaw in 1988.
In fact, the word “pi” itself was actually derived from the first letter of the Greek word perimetros, which means circumference. In 2015, Pi Day fanatics had a special treat. Celebrations took place on 3/14/15 at 9:26:53 a.m., the numerical date and time together representing the first 10 digits of pi, 3.141592653.
In the year 2015, March 14 was celebrated as “Super Pi Day“. It had special significance, as the date is written as 3/14/15 in month/day/year format. At 9:26:53, the date and time together represented the first 10 digits of π.
The symbol used by mathematicians to represent the ratio of a circle’s circumference to its diameter is the lowercase Greek letter π, sometimes spelled out as pi, and derived from the first letter of the Greek word perimetros, meaning circumference. In English, π is pronounced as “pie” (/pa?/ PY).

Beside above, why is Pi Day important? The concept of pi is important to mathematics because of its relationship to the circle; it is a constant representing the ratio of a circle’s circumference to its diameter. The Exploratorium continues to hold an annual Pi Day Celebration, which has gotten larger each year.

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