Yesterday was the PI Day, as every March, 14 day is, every year. But yesterday was special because the year we are in is 2015. The English spoken world spells the year as “15”. So, writing the day, today, we have 3.14.15. Coincidentally, 15 are the following decimals after 14, “3.14” being the general and the most often used abbreviation of what “Pi” represents.
First nine decimals of π can be represented by just giving the exact date and time at nine twenty six and fifty three seconds, on a day of 3.14.15 as in the picture above.
Pi, the Greek symbol (π) represents the ratio of a circle’s circumference to its diameter. It was first used by a Welsh, William Jones, a self taught mathematician around 1700.
William Jones was the first person to use the Greek letter π for the ratio of a circle’s circumference to its diameter.
Jones realized that the decimal 3.141592 … never ends and that it cannot be expressed precisely. “The exact proportion between the diameter and the circumference can never be expressed in numbers,” he wrote. That was why he recognized that it needed its own symbol to represent it. He chose π either because it is first letter of the word for periphery (περιφέρεια) or because it is the first letter of the word for perimeter (περίμετρος).
That’s it dear friends, and if you want to be real mathematical geeks, you can consider also the centiseconds like they do with the races at the Olympics and you have π with eleven decimals represented.
The last two digits are centiseconds. My dear Adriana made a delicious apple pie on Pi Day. I have been out all day and couldn’t share the joy of it with you, nor this very article. Anyway, I wrote it just to say some words about Pi, Mr Jones and Pi Day. This can happen only every hundred years , on a year with “15” as its last digits. Otherwise, if you are not pretentious, you can use this delicious coincidence every year, and make yourself (or buy, as you wish and it suits you) a pie every March 14.
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