Fibonacci Day 1009

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 1009?

Fibonacci Day 1009 is on Thursday, 23 November 1009.

What day of the week is Fibonacci Day 1009?

It falls on Thursday.

How is Fibonacci Day calculated?

This event is observed every year on 23 November.