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

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

More Desktop Wallpapers:

Feb. 9, 2026Amur leopard cat, Russia
This lesson is going swimmingly
Feb. 5, 2025Scottish Blackface sheep, Aberdeenshire, Scotland
Commemorating Indigenous Peoples
Nov. 12, 2023Diwali
Mar. 1, 2026Snowy owl near the Canadian Rockies
A beach of many colours
Mar. 28, 2024Cherry blossoms in Shanghai, China
Fragrant fields as far as the eye can see
Aug. 19, 2024Two Atlantic puffins in Elliston
Jun. 27, 2025Splendid leaf frog
World Hippo Day, a giant celebration
Mar. 28, 2025Black-naped monarch
Mar. 19, 2024Spring equinox
Dragon tails trail to the sea
Jan. 2, 2024Prayer flags in Phobjikha Valley, Bhutan
Sep. 11, 2023French River, Ontario
Jul. 11, 2024World Population Day
Sway with the Amazonian canopy
Jan. 1, 2024Happy New Year!
Oct. 31, 2023Halloween
Nature at its colourful best
Jul. 21, 2025Coral Reef Awareness Week
Aug. 9, 2024International Day of the Worlds Indigenous Peoples
American Red Cross pioneers
Jun. 2, 2025Fogo Island, Newfoundland and Labrador
Hot enough to howl
Nov. 19, 2025Hungarian Parliament Building, Budapest, Hungary
Apr. 8, 2025Paro Tsechu Festival, Bhutan
Nov. 18, 2025Male hooded merganser, Oregon, United States