Pi Day is an unofficial holiday held to celebrate the mathematical constant π (Pi). This holiday is usually celebrated by people who think that there are not enough holidays.

Usually celebrated with a large serving of pie, this holiday is usually observed on March 14, due to pi being equal to roughly 3.14. Sometimes it is celebrated on March 14 at 1:59 p.m. (commonly known as "Pi Minute").

If pi is rounded out to seven decimal places, it becomes 3.1415926, making March 14 at 1:59:26 p.m., "Pi Second".

March 14 also happens to be Albert Einstein's birthday.

Contrary to popular belief, 22/7 is not that close to π.

Secondary school's a sham.

22/7 is a widely used Diophantine approximation of π. It is greater than π, as can be readily seen in the decimal expansions of these values:

22/7 ~ 3.142857
π~ 3.141592

The approximation has been known since antiquity. Archimedes wrote the first known proof that 22/7 is an overestimate in the 3rd century BCE, although he did not necessarily invent the approximation.

Seriously, who notes these stuff?

His proof proceeds by showing that 22/7 is greater than the ratio of the perimeter of a circumscribed regular polygon with 96 sides to the diameter of the circle.


Digression:-

It's possible to prove that '0.999...' is actually 1!

Let '0.999...' be 'c'.

c= 0.999...
10c= 9.99...
10c-c= 9.99... - 0.99...
9c=9

Therefore, c=1.

Wait, what just happened?


March 14th is also a day that is celebrated by White Day.

White Day is a growing tradition that was created through a concentrated marketing effort in Japan. It is celebrated in Japan, South Korea, Taiwan and some other East Asian countries one month after Valentine's Day.

On Valentine's Day, women give gifts to men; on White Day, men who received chocolate on Valentine's Day return the favor and give gifts to women.

Yes- What goes around, comes around.

This holiday is starting to gain popularity in Hong Kong, where Japanese influence is strong. The observance of Valentine's Day in Japan, particularly among students, is somewhat different than in the West.

Valentine's day is mainly for the girls to present chocolates (either store-bought or handmade) to the boy of their choice. The concept of "Giri-Choco", which translates as "Obligatory Chocolate", has also developed, where a girl will give chocolate to those close to her (co-workers, for example) but in whom she has no romantic interest.

When White Day rolls around, it is the boy's turn to return the gift in what is called "sanbai-gaeshi" or "triple return", since the gift the boy gives is supposed to be three times the value of the gift received initially.

Hence, it is advisable to invest heavily into Valentine's day. Girls, mortgage everything you have and buy everything for everyone you know. Get your boyfriend a sports car; he'll have to get you a jewellery store for White Day.

Heck, let it loose and buy a chocolate factory.

There are many theories about the origins of White Day. According to one, the holiday began in 1965 when a marshmallow maker started marketing to men that they should pay back the women who gave them chocolate and other gifts with marshmallows. Originally it was called Marshmallow Day, which was later changed to White Day.

Soon thereafter, confectionary companies began to realize that they could capitalize on such a tradition as well, and began marketing white chocolate. Now, Japanese men give both white and non-white chocolate, as well as other edible and non-edible gifts, such as jewelry or objects of sentimental value, to women from whom they received chocolate on Valentine's Day one month earlier.