# Top Ten: Mathematical celebration days

The definitive chart of the best dates

This issue, Top Ten features the top ten mathematical celebration days! Then vote here on the top ten units for Issue 08!

Reentering the top ten, it’s the day of monthly MathsJam: the second last Tuesday of the month.

At 9 this issue, the favorite day of fans of the American date format and decimals: Pi day (14 March).

A new entry at 8: Hannah Fry’s birthday, or Fryday (21 February).

At 7, it’s the day commemorating physicists trying to do infinite series: sum of all the negative integers day (1 December).

At 6, it’s a celebration for people who’d rather have two pies: Tau day (28 June).

At 5, it’s the favourite day of people who like good date formats and fractions: Pi approximation day (22 July).

At four, it’s 25 December, the day we celebrate the birth of our lord and saviour: Sir Isaac Newton’s birthday.

At 3, it’s days like 15 August 2017 ($15^2+8^2=17^2$): Pythagorean triple days.

At two, it’s the Chalkiest day in March: 13 March.

There’s an approximately 1 in 365.25 chance that the picture for this issue’s number one is relevant: it’s today, because every day is a great day for maths.

• ### Chalkdust issue 15 – Coming 25 May

Roll up, roll up! Squid Game, hidden harmonies and DnD coming your way in Issue 15. (Plus all the usual nonsense.)
• ### Crossnumber winners, Issue 14

Did you solve it?
• ### How to Think About Abstract Algebra

We review the seventh of this year’s nominees for the Book of the Year
• ### Math Without Numbers

We review the sixth of this year’s nominees for the Book of the Year
• ### Maths Tricks to Blow Your Mind

We review the fifth of this year’s nominees for the Book of the Year
• ### At Sixes and Sevens

We review the fourth of this year’s nominees for the Book of the Year