# This Day in History: 23rd November every year is observed as Fibonacci Day, know what is Fibonacci sequence and other details

22 Nov, 2021
Thinking Muse 23rd November in History:

Many great people have contributed to the mathematics we implement in our daily life these days. Such people are always remembered to date for the contribution they made such as Aryabhatt, Srinivasa Ramanujan, etc., and one such person was Leonardo Fibonacci. So, in today’s “This Day in History” article, we will know more about the great contribution made by Leonardo Fibonacci.

23rd November every year is celebrated as Fibonacci Day.

## What is Fibonacci Sequence:

Fibonacci is a sequence of numbers when the date is written in the mm/dd format (11/23), the digits in the date are written in a Fibonacci sequence. The Fibonacci sequence is a series of numbers when the sum of the first two numbers forms the third number. For Example, 1,1,2,3 where the sum of (1+1) forms 2 and the sum of (1+2) forms 3.

## Why do we celebrate 23rd November as Fibonacci Day?

23rd November every year is celebrated as Fibonacci Day, because when we write the date "23/11" in the mm/dd format, it forms the Fibonacci sequence of “1,1,2,3” i.e., the sum of (1+1) forms 2 and the sum of (1+2) forms 3.

## Who was Leonardo Bonacci?

Also known as Fibonacci, Leonardo of Pisa or Leonardo Bigollol Pisano (Leonardo the traveler from Pisa) was an Italian mathematician from the Republic of Pisa who popularized the Hindu-Arabic numeral system in the Western world especially through his composition in 1202 of Liber Abaci (Book of Calculation). Fibonacci introduced Europe to the sequence of Fibonacci numbers.

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