Fibonacci Day 1620

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 1620?

Fibonacci Day 1620 is on Monday, 23 November 1620.

What day of the week is Fibonacci Day 1620?

It falls on Monday.

How is Fibonacci Day calculated?

This event is observed every year on 23 November.