Today is March 14th
International Pi Day (π day)
March 14 15 points 9 minutes 26 seconds
It's the punctual moment to celebrate it
But in 2020
The first π-day press conference
Cancelled due to the pandemic
November 26
40th Session of the General Conference of UNESCO
Approval was announced on March 14
For the International Day of Mathematics
It is also International Pi Day
Even weirder
Today is Einstein's birthday
and Hawking's death day
International Pi Day
Dates back to March 14, 1988
Physicist Larry Shaw of the Science Museum in San Francisco
He organizes museum staff and participants
Do a 22/7 circle movement around the museum monument
22/7 is one of the approximations of π
And eat fruit pie together
This became a tradition at the Science Museum in San Francisco
π is a constant
This number is multiplied by the square of the radius
It becomes an area of a circle
Many civilizations have discovered pi
Like what
Babylonian culture and Egyptian culture
It is likely that the concept of pi was discovered around 2000 BC
Circa 250 BC
Archimedes' Measurement of the Circle
The concept of Pi was further clarified
250 AD
Chinese mathematician Liu Hui
Calculated in the Nine Chapters of Arithmetic
The first five digits of Pi
3.1416
More than two hundred years have passed
Zu Chongzhi, the great scientist of the Southern and Northern Dynasties
For the first time in the world
Pi is accurate to that point
Seventh decimal place
3.1415926
For this reason, he was selected into the World Records Association
The world's first place will be pi value
Scientists who calculate to 7th decimal place
Zu Chongzhi also gave two fractional forms of π
22/7 (approx. rate) and 355/113 (density rate)
Since constants are infinite
18th-century English mathematician
William Jones referred to it simply as π
The value of the π is then calculated
Become obsessive mathematical problems
Before the invention of the computer in the 19th century
Someone has already calculated
More than 700 people after the decimal point
After the invention of the computer
π calculations are beyond the scope of practical use
Π reached in 2002
24 trillion decimal places
This record continues to be broken
Constant π
Condensed the pursuit of mankind across thousands of years
Explore nature
Challenge the unknown
Pursue the beauty of reason
Author: Xu Qimin
Image: Baidu Encyclopedia, pixabay, piday website