Fibonacci Day 1619

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 1619?

Fibonacci Day 1619 is on Saturday, 23 November 1619.

What day of the week is Fibonacci Day 1619?

It falls on Saturday.

How is Fibonacci Day calculated?

This event is observed every year on 23 November.