Fibonacci Day 2009

Fibonacci Day uses the month and day notation 11/23 to echo the opening numbers of the Fibonacci sequence: 1, 1, 2, 3.

Frequently asked questions

When is Fibonacci Day 2009?

Fibonacci Day 2009 is on Monday, 23 November 2009.

What day of the week is Fibonacci Day 2009?

It falls on Monday.

How is Fibonacci Day calculated?

This event is observed every year on 23 November.