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:

Oct 2, 2023World Architecture Day
Apr 9, 2020Hooray, hooray, it s Unicorn Day!
Apr 1, 2023Frog Month
Oct 21, 2025Happy Diwali!
Jul 23, 2023Nuwara Eliya, Sri Lanka
May 1, 2019Purple flowers and Golden Week
Feb 1, 2018Stuben am Arlberg, Austria
May 27, 2020Clouds over the River of Grass
May 19, 2021A path lain with petals
Apr 11, 2018Zhangjiajie National Forest Park in Hunan Province, China
Jun 22, 2025World Rainforest Day
Sep 16, 2025Nighttime view over the Gulf Coast
Apr 13, 2025Songkran—Thai New Year
Dec 2, 2023Angkor, Cambodia
Mar 2, 2025Megalong Valley, Blue Mountains National Park, Australia
Oct 27, 2023Sligachan Old Bridge, Isle of Skye, Scotland
Mar 12, 2018It’s Napping Day
Apr 10, 2018It’s Siblings Day!
Feb 20, 2019An unlikely friendship in the wild
Sep 7, 2018An historic forest
Nov 8, 2024Glacial rivers in Iceland
Mar 28, 2020The meeting point of the winds
Apr 16, 2018The Bazaruto Archipelago of Mozambique
Oct 19, 2018Portland celebrates its bounty
Oct 1, 2018It’s NASA’s 60th birthday
Nov 5, 2022Tigh Mor Trossachs on Loch Achray, Scotland
Mar 10, 2024Daylight saving time
Aug 7, 2024St. Joseph North Pier Inner and Outer Lights, Michigan
Oct 10, 2025Visiting the Mamanuca Islands for Fiji Day
Jul 3, 2021Diving into the underwater nirvana