Fibonacci Day 23 Nov 2025

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

Finding maths in nature
23 Nov 2023Teide National Park, Tenerife, Canary Islands, Spain
23 Nov 2024Fibonacci Day

More Desktop Wallpapers:

19 Jul 2024A young jaguar on a riverbank, Pantanal, Brazil
13 Jan 2024Road to Hana, Maui, Hawaii, USA
Why is this cliffside ablaze?
Aug 22, 2023Amphitheatre of El Jem, Tunisia
2 Apr 2025Sandstone formations in the badlands near Caineville, Utah, United States
24 Mar 2024Silvereyes
One rare streak
20 Jan 2024Macaroni penguins
Im ready for my close-up, Mr. DeSquirrel
14 Aug 2025Cable car station on Piz Nair mountain, Graubünden, Switzerland
Just a pinch
20 Oct 2024International Sloth Day
Rock House in Hocking Hills State Park, Ohio
29 Aug 2025Aerial view of Plaza Mayor, Madrid, Spain
Just a couple of know-it-owls
18 Dec 2023Capitol Reef National Park, Utah, USA
1 Nov 2023Haut-Barr Castle
A right royal tradition
29 Jan 2025Porto, Portugal
Tis the season for travel
1 Jul 2024Canada Day
8 Dec 2024Notre-Dame reopens
3 Nov 2025World Jellyfish Day
Stretching to the sky
6 Jan 2024Oud-West neighbourhood, Amsterdam, Netherlands
Tune into International Jazz Day
Ablaze with colour
18 Feb 2024World Whale Day
A mirror reflecting natures beauty
1 Nov 2024Vineyards in Varnhalt, Black Forest, Germany