Fibonacci Day Nov 23, 2025

Fibonacci Day

Look closely at this ammonite fossil. Its swirling shell, once home to a prehistoric sea creature, holds a mathematical secret—a spiral pattern. Each new chamber is proportionally larger than the previous one, maintaining a consistent growth ratio, often associated with the Fibonacci sequence.

© ThomasLENNE/Shutterstock

palette

Today in History

Nov 23, 2018Let the holiday shopping commence
Nov 23, 20191, 1, 2, 3: It s Fibonacci Day!
Nov 23, 2020Autumn comes to Old Town
Nov 23, 2021Fibonacci Day
Nov 23, 2022Fibonacci Day
Nov 23, 2023Happy Thanksgiving!
Nov 23, 2024Fibonacci Day

More Desktop Wallpapers:

May 25, 2023Saksun, Faroe Islands, Denmark
Jul 3, 2022Dog days of summer
Feb 11, 2025Yungang Grottoes, Shanxi, China
Aug 3, 2025Blooming sunflowers
Aug 20, 2018Looking back at Yellowstone, 30 years after the fires
Jul 20, 2023International Moon Day
Jan 1, 2022New Year s Day
Nov 4, 2025Tower Bridge, London, England
Nov 4, 2020Caribou on the move
Aug 18, 2023Avatar Mountains, Zhangjiajie National Forest Park, China
Jun 30, 2018The aftermath of a meteorite
Nov 20, 2019Atop the roof of Africa
Jul 26, 2024Summer Olympics begin in Paris
Mar 24, 2021A whale of a picture
Feb 6, 2020A hint of spring
Jul 27, 2024Vineyards in the Mosel Valley, Rhineland-Palatinate, Germany
Dec 21, 2021Winter solstice
Mar 10, 2023Vale of Edale, Peak District, England
Mar 17, 2025Happy St. Patricks Day!
Jul 25, 2025Colorful houses of Las Palmas de Gran Canaria, Spain
Jan 1, 2025Happy New Year!
Aug 22, 2021A wild, craggy corner of the United States
Oct 29, 2018In search of a ‘great’ pumpkin
Oct 26, 2021Red fox
Mar 7, 2019March of the flowers
Feb 19, 2025European river otter, Netherlands
Jul 5, 2024Daintree Rainforest and Noah Beach, Queensland, Australia
Sep 6, 2023Rethymno, Crete, Greece
Jan 24, 2020Sunlight sets Iceland s Eyjafjallajökull aglow
Oct 4, 2018From Sputnik to extraterrestrial storms