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:

Lighting the way
Reflecting the beauty of the Lakes
26 Dec 2024Boxing Day
Sep 2, 2023National Hummingbird Day
29 Mar 2025Superbloom in Carrizo Plain National Monument, California, United States
Lighting the world
Keep practising, little guy
29 Jul 2025International Tiger Day
1 Mar 2026Saint Davids Day
10 Apr 2026Black grouse males, Estonia
11 Oct 2025World Migratory Bird Day
A flashy, frigid waterfowl
26 Oct 2025British Summer Time ends
24 Mar 2025Sydney Harbour, New South Wales, Australia
25 Oct 2024Frankenstein Friday
2 Dec 2023Angkor, Cambodia
15 Aug 2024Hang Sơn Đoòng, Phong Nha-Kẻ Bàng National Park, Vietnam
22 Feb 2026Mam Tor, Derbyshire, England
11 Sep 2024Rapa Nui National Park, Easter Island, Chile
Festival fever
16 Aug 2025The Isle of Wight Garlic Festival
25 Aug 2024Glacier National Park, Montana, USA
21 Sep 2025Sea Otter Awareness Week
29 Jul 2024Tiger siblings in Jim Corbett National Park, Uttarakhand, India
29 Oct 2024Great horned owl
What are these unique creatures?
5 Mar 2024Bangkok, Thailand
Stealthy pollinators
24 Mar 2026Cherry blossoms at East Lake Cherry Blossom Park, Wuhan, China
Sep 5, 2023Mount Segla, Senja Island, Norway