## E-Day (Eulers Number)

E-day is celebrated to celebrate the mathematical constant e, which is called as Euler’s Number and has a value
of 2.7182818.

It is celebrated on 7th of February every year. The date is chosen from the the first two digits of the
Euler’s Number.

## Fibonacci Day

Fibonacci Day is celebrated on 23rd of November every year. It is celebrated to honour Italian mathematician
Leonardo Bonacci, the most talented Western Mathematician of the Middle Ages.

He is also known as Leonardo of Pisa and Leonardo Fibonacci. He introduced Europe to the **Hindu-Arabic numeral
system** to ease the calculations with numbers unlike Roman numerals.

He introduced one of the most influential sequence of numbers called as **Fibonacci Numbers**, which further
derives a unique ratio in mathematics, called as “Golden Ratio”.
Surprisingly, Golden ratio can describe many phenomenon of nature to financial markets.

Fibonacci day is celebrated on 23rd November every year and the date 11/23 is selected because the digits in
11/23 makes the part of Fibonacci sequence i.e. 1, 1, 2, 3.

## National Mathematics Day (India)

National Mathematics day is celebrated in India on 22 December every year which is the birth anniversary of
famous mathematician Srinivasa
Ramanujan.

Srinivasa Ramanujan was an Indian mathematician who contributed to **number theory**, **infinite
series** and **continued fractions** in his short span of life only.

He was the youngest to receive **Fellows of the Royal Society** and elected as **Fellow of Trinity
College, Cambridge**.

## Palindrome Day

Palindrome Day is the day of the year which makes same pattern like Palindrome. Palindrome is word or a number
which can be read in both forward and backward directions and reading in both directions makes the same word or
the number.

For a day to be a palindrome it must be in a format of mm/dd/yyyy or mm/dd/yy.

**20 April, 2024**

We can write it as 4/20/24 in m/dd/yy format.

The number sequence is 42024 in forward direction (left to right).

And, number sequence is 42024 in backward direction (right to left).

So, it is a palindrome because the number 42024 comes out to be same if read in either direction, which
makes 4/20/24 as a palindrome day.

**The last palindrome day celebrated was on 20/03/2023.**

### List of the last Palindrome Days in 2023

Date | Number in forward direction | Number in backward direction |
---|---|---|

March 20, 2023 (3/20/23) | 32023 | 32023 |

March 21, 2023 (3/21/23) | 32123 | 32123 |

March 22, 2023 (3/22/23) | 32223 | 32223 |

March 23, 2023 (3/23/23) | 32323 | 32323 |

March 24, 2023 (3/24/23) | 32423 | 32423 |

March 25, 2023 (3/25/23) | 32523 | 32523 |

March 26, 2023 (3/26/23) | 32623 | 32623 |

March 27, 2023 (3/27/23) | 32723 | 32723 |

March 28, 2023 (3/28/23) | 32823 | 32823 |

March 29, 2023 (3/29/23) | 32923 | 32923 |

**The next upcoming palindrome will be on 20/04/2024.**

### List of upcoming Palindrome Days in 2024

Date | Number in forward direction | Number in backward direction |
---|---|---|

April 20, 2024 (4/20/24) | 42024 | 42024 |

April 21, 2024 (4/21/24) | 42124 | 42124 |

April 22, 2024 (4/22/24) | 42224 | 42224 |

April 23, 2024 (4/23/24) | 42324 | 42324 |

April 24, 2024 (4/24/24) | 42424 | 42424 |

April 25, 2024 (4/25/24) | 42524 | 42524 |

April 26, 2024 (4/26/24) | 42624 | 42624 |

April 27, 2024 (4/27/24) | 42724 | 42724 |

April 28, 2024 (4/28/24) | 42824 | 42824 |

April 29, 2024 (4/29/24) | 42924 | 42924 |

## Pi Day (International Day of Mathematics)

Pi is the most famous number and a mathematical constant, which has a value of 3.142. It is observed on 14 March
of every year. It is also known by the name of International Day of Mathematics from November, 2019 onwards.

The official website of International Day of Mathematics is
The International Day of Mathematics (IDM).

It is observed on 3/14 because the three digits 3, 1 and 4 makes the first 3 numbers of Pi value.

## Pythagorean Theorem Day

Pythagorean Theorem Day is celebrated all over the world to celebrate the famous theorem of Geometry **Pythagoras
Theorem**. The date of celebration is calculated using the Pythagoras formula.

We know the Pythagoras formula states that the sum of squares of perpendicular and base is equal to the square
of the hypotenuse.

The date of celebration in a year falls on the day when the sum of squares of date and month equals the square
of the last two digits of the year.

**Pythagorean Theorem Day in year 2017 was 15 August, 2017**. Let’s see how it is calculated.

Date = 15

Month = 8

Last two digits of year 2017 = 17

∴ 15^{2} + 8^{2} = 225 + 64 = 289

also, 17^{2} = 289

So, for **15 August, 2017**, sum of squares of 15 and 8 is equal to square of 17.

This is how the date is calculated for Pythagorean Theorem Day.

The next Pythagorean Theorem Day in the future falls on 24 July, 2025.

## Square Root Day

Square Root Day is the rarest mathematics day because it cannot be celebrated every year. Surprisingly, its
occurrence is only 9 times in one century.

It is celebrated on the days when both date and month are the square root values of the last two digits of
the year.

It was started by Ron Gordon, a high school teacher from Redwood City, California on September 9, 1981
(9/9/81).

The last square root day celebrated was on 4 April, 2016 (4/4/2016). The next upcoming Square Root Day is 5
May, 2025 (5/5/25).

Let’s take an example of square root day and see how it is calculated.

**February 2, 2004 (2/2/04)**

day = 2, month = 2, year = 04

day = 2 = √4

month = 2 = √4

So, square root of year 04 is equal to both day 02 and month 02 of 2/2/04

### List of Square Root Days in a century

Date | Day | Month | Year | Square root of year |
---|---|---|---|---|

January 1, 2001 (1/1/01) | 1 | 1 | 1 | √1 = 1 |

February 2, 2004 (2/2/04) | 2 | 2 | 4 | √4 = 2 |

March 3, 2009 (3/3/09) | 3 | 3 | 9 | √9 = 3 |

April 4, 2016 (4/4/16) | 4 | 4 | 16 | √16 = 4 |

May 5, 2025 (5/5/25) | 5 | 5 | 25 | √25 = 5 |

June 6, 2036 (6/6/36) | 6 | 6 | 36 | √1 = 6 |

July 7, 2049 (7/7/49) | 7 | 7 | 49 | √49 = 7 |

August 8, 2064 (8/8/64) | 8 | 8 | 64 | √64 = 8 |

September 9, 2081 (9/9/81) | 9 | 9 | 81 | √81 = 9 |

## Women in Mathematics Day

Women in Mathematics Day is celebrated worldwide on 12th of May every year.

It is the day to celebrate for women in mathematics for their achievements in the field of mathematics and
to encourage to an open, welcoming and inclusive environment for everybody.

The events to celebrate the day take place from 1 May to 15 June.

May 12 Initiative is the website whose goal is to
inspire
women everywhere in the world to celebrate their achievements in mathematics and to encourage an open, welcoming
and
inclusive work environment for everybody.

## World Maths Day

World Maths Day (23 March 2023) is a global celebration of mathematics where millions of students aged 5 to 18
across
the world compete in Live Mathletics challenges.

It’s free and open to schools all over the world. Any student aged from 5 to 18 years can participate and win
the prizes.

If you would like to know more about how it works, what to do on the day and download World Maths Day
Handbook, please visit
World Maths
Day by 3P Learning website.

## List of important days in Mathematics

Name | Date | Website Link |
---|---|---|

E-Day (Eulers Number) | 7th of February every year | – |

Fibonacci Day | 23rd of November every year | – |

National Mathematics Day (India) | 22 December | – |

Palindrome Day | Next days are from March 20 to March 29 in 2023 | – |

Pi Day | 14th of March every year | The International Day of Mathematics (IDM) |

Pythagorean Theorem Day | Not a fixed date | – |

Square Root Day | Occurs 9 times only in one century | – |

Women in Mathematics Day | 12th of May every year | Celebrating Women in Mathematics (May12 Initiative) |

World Maths Day | Not a fixed date | World Maths Day (3P Learning) |