Celebrating Pi Day 14 Mar 2025

Celebrating Pi Day

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!
14 Mar 2026Celebrating Pi Day

More Desktop Wallpapers:

Flying the flag for Pride
15 Oct 2025Amethyst laccaria mushrooms, Seabeck, Washington, United States
7 Feb 2024St James Tidal Pool, Cape Town, South Africa
King of the jungle? Nope
Patchwork of peace
Singing the blues
Behold the architectural marvel
17 Aug 2024International Lighthouse and Lightship Weekend
Alpine grandeur
19 Jan 2024Plitvice Lakes National Park, Croatia
Incan ingenuity
18 Nov 2024Porthcawl lighthouse, Wales
26 Feb 2025Castle Stalker, Argyll, Scotland
Living rock
5 Oct 2023World Teachers Day
30 Nov 2023Leadenhall Market, London
9 May 2024Tulips at Emirgan Park in Istanbul, Türkiye
Remembering D-Day
28 Apr 2025Impala in Moremi Game Reserve, Botswana
22 Nov 2023Grand Teton National Park, Wyoming, USA
26 Feb 2026Grand Canyon and the Colorado River, Arizona, United States
25 Apr 2026World Penguin Day
Hiding in the woods
A day for giving
Happy New Year!
19 Oct 2025Apples ready for harvest, Minnesota, United States
A one-of-a-kind splash
Butterfly, fly away
So nice, they made it twice
26 Apr 2024Tree of Life, Olympic National Park, Washington, USA