Fibonacci Day Nov. 23, 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

Nature, art, and...math?
Nov. 23, 2023Teide National Park, Tenerife, Canary Islands, Spain
Nov. 23, 2024Fibonacci Day

More Desktop Wallpapers:

The mystery of Stonehenge
Beauty resides in trees
Apr. 14, 2024Bowling Ball Beach, California, USA
Nov. 21, 2025World Hello Day
Dec. 30, 2023Daiichi Tadami River Bridge, Fukushima, Japan
Want to hang out?
Jun. 24, 2024Kelimutu, Flores, Indonesia
History awaits atop the hill
Nov. 22, 2023Grand Teton National Park, Wyoming
Jul. 19, 2024A young jaguar on a riverbank, Pantanal, Brazil
Apr. 2, 2025Sandstone formations in the badlands near Caineville, Utah, United States
American Red Cross pioneers
Jan. 7, 2025Moeraki Boulders, South Island, New Zealand
Sep. 6, 2024Glenariff Forest Park, Northern Ireland, UK
King of the ocean
Nov. 1, 2023Kenny Lake, Lake Superior Provincial Park
Where did you drop the fish, son?
Where is this scenic view?
A glowing square of squares
Dec. 31, 2024New Years Eve in Ottawa
Jul 18, 2026Devils Bridge, Kromlau, Saxony, Germany
May 14, 2026Pitigliano, Tuscany, Italy
Feb. 27, 2024International Polar Bear Day
Jun 3, 2026World Bicycle Day
Platinum Jubilee celebrations
Majestic lord of the skies
Jan. 18, 2024Pont Alexandre III, Paris, France
A scented sea of purple
Oct. 23, 2025International Day of the Snow Leopard
Dec. 7, 2023Verdon Gorge, France