# Fibonacci Day: The Ultimate Guide to the Fibonacci Sequence and its Tattoos

Updated: Dec 7, 2020

Fibonacci Day is celebrated on November 23rd every year, to commemorate the research done by Leonardo Fibonacci on Fibonacci numbers and the golden ratio. This number is said to be found in many places around us, even in plants and humans. This series of numbers is calculated by adding the previous two numbers on the number line to get to the next number. The series goes like this: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55…and so on, till infinity and beyond. Leonardo of Pisa, famously known as Fibonacci (son of Bonacci), was born in a family of traders in 12th-century Italy. He was inspired by the Hindu-Arabic system of arithmetics for calculations, which were easier for mathematical operations like addition, subtraction, multiplication, and division than the Roman numerals the Europeans used.

This system was originally discovered by Indian scientists like Pingala, Bharata Muni, and Virahanka, and is also connected to Sanskrit prosody. Fibonacci wrote about this phenomenon in the book Liber Abaci and explained it by linking it to rabbits and their rate of reproduction.

Source: Pinterest

This occurrence happens in nature too, such as in a sunflower, the shell of a na