Celebrating Pi Day 14 Mar 2025

Calculating the ratio of a circle"s circumference to its diameter is as easy as pi. Today is Pi Day, an event that celebrates this mathematical constant. This date was chosen because 3, 1 and 4 are the first three significant figures of pi (π) when it is written out. Pi is an irrational number, which means that it can"t be written as a fraction. When written out, its decimal representation goes on infinitely without repeating. The oldest attempts to calculate pi date back to ancient Babylon and Egypt, around 1,900 BCE.

© David Herraez Calzada/plainpicture

palette

Today in History

A beautiful labyrinth
14 Mar 2024Happy Pi Day!

More Desktop Wallpapers:

11 Mar 2024Koala
15 Mar 2024Anza-Borrego Desert State Park, California, USA
Time to make an impression
6 Jul 2025Tour de France
9 Jan 2025Sossusvlei sand dunes, Namib desert, Namibia
16 Aug 2025The Isle of Wight Garlic Festival
12 Dec 2024Poinsettia or Christmas flower
20 Aug 2024Grand Teton National Park, Wyoming, USA
Centuries of time in a Delicate Arch
26 Jul 2024Summer Olympics begin in Paris
A curious little otter pup
22 Apr 2025Earth Day
30 May 2025Little Pigeon River, Great Smoky Mountains National Park, United States
16 Apr 2024Union Square, Manhattan, New York, USA
22 Sep 2025Autumn equinox
18 Oct 2025International Archaeology Day
6 May 2024The ruins of an ancient monastery, Skellig Michael, Ireland
Taking the long view
13 Apr 2025Songkran—Thai New Year
10 Sep 2025Hay bales in North Yorkshire, England
Beauty by the bay
7 Jul 2025Northern gannets, Shetland Islands, Scotland
Back to the future
May the 4th be with you
Nothing says ‘San Francisco’ quite like...
31 Dec 2024Hogmanay
2 May 2024Craters of the Moon National Monument, Idaho, USA
A beacon in the golden light
29 Sep 2023Castell Coch, Wales
6 Feb 2025Waitangi Day in New Zealand