Fibonacci Day is celebrated every year on November 23rd. It is a day to celebrate the amazing work of Leonardo Fibonacci, an Italian mathematician who lived from 1170 to 1247. Fibonacci is best known for his discovery of the Fibonacci sequence, a series of numbers in which each number is the sum of the two preceding ones.
The Fibonacci sequence is found in many things in nature, including the arrangement of seeds in a sunflower, the branching of a tree, and the spirals of a nautilus shell. It is also used in art, music, and architecture.