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:

A window to the Pacific
Dec. 30, 2023Daiichi Tadami River Bridge, Fukushima, Japan
Apr. 1, 2024April Fools Day
Jun. 19, 2024Lewa Wildlife Conservancy, Kenya
Jan. 9, 2025Sossusvlei sand dunes, Namib desert, Namibia
Sep. 10, 2024Vasco da Gama Bridge, Lisbon, Portugal
Aug. 29, 2024Castellfollit de la Roca, Catalonia, Spain
Big Bends birthday bash
Feb. 2, 2024Groundhog Day
Dec. 5, 2025Maya site of Copán
Surrounded by a sea of sand
Sep. 28, 2023World Maritime Day
Feb. 16, 2024Great Backyard Bird Count
Positively purple peaks
Mar. 23, 2025World Meteorological Day
Feb. 28, 2025Bighorn sheep in Valley of Fire State Park, Nevada, United States
Feb. 12, 2025Celebrating Charles Darwin
May 9, 2024Misool, Raja Ampat Islands, Indonesia
Sep. 12, 2025World Dolphin Day
Nature’s blue wonder
Mar. 20, 2024Cave Dale and Peveril Castle, England
And so it begins!
Why are blackbirds tied to winter?
A vibrant, sun-drenched island
Heavenly hot springs
Mar. 16, 2025Happy Panda Day!
Family on parade
Nov. 10, 2025Badlands National Park, South Dakota, United States
Feb. 13, 2024Mardi Gras
Part science experiment, part public park