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:

Dec 11, 2020Mountains fit for a queen
Dec 21, 2024Happy winter solstice!
Apr 14, 2023Mediterranean red sea stars
May 30, 2023Playa del Amor, Marietas Islands, Mexico
Sep 7, 2022200th anniversary of Brazilian independence
Nov 17, 2019Remembering the Velvet Revolution
Feb 4, 2023Rosa Parks Day
Feb 4, 2025Golden Bridge, Bà Nà Hills, Da Nang, Vietnam
Jun 1, 2023World Reef Awareness Day
Feb 25, 2019High above the reef
Jan 19, 2024Plitvice Lakes National Park, Croatia
Jan 10, 2022Ski touring in Austria
May 13, 2021Hues of Hokkaido
Feb 17, 2024Black History Month
Feb 6, 2023Fiordland National Park, New Zealand
Aug 2, 2023Capitol Reef National Park, Utah
Feb 16, 2023Horsetail Fall, Yosemite National Park, California
Oct 6, 2020Water colors
Apr 6, 2018It’s National Walk to Work Day
May 28, 2019Why’s it called a spelling ‘bee,’ anyhow?
Apr 18, 2026World Heritage Day
May 27, 2019Reflections on Memorial Day
Mar 20, 2024National Cherry Blossom Festival
Feb 20, 2019An unlikely friendship in the wild
Aug 2, 2022Happy birthday, Capitol Reef National Park
Apr 1, 2024April Fools Day
Jul 8, 2021A storied trail marks a century
Jan 13, 2021Strolling across the Red Lagoon
May 29, 2024World Otter Day
Jan 2, 2019Tesla, the visionary