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:

Behold the architectural marvel
A world within a world
An architectural masterpiece fit for a king
If these walls could talk...
A delightful day for donkeys
Rocky Mountain run-off
16 Oct 2025Eurasian lynx
29 Nov 2024Mont-Saint-Michel, Normandy, France
World Population Day
Happy Yorkshire Day!
31 Jul 2024Hoodoos, Sunset Point, Bryce Canyon National Park, Utah, USA
4 Apr 2026Discover National Parks Fortnight
31 May 2025Knuthöjdsmossen nature reserve, Sweden
8 Sep 2025International Literacy Day
4 Jan 2024Golden Gate Bridge, San Francisco, California, USA
What’s your favorite colour?
16 Feb 2024Female pyrrhuloxia in Texas, USA
11 Jun 2025Greater flamingos, Lüderitz, Namibia
Blue hues and ceramic scenes of Porto
4 Jul 2024Italica, an old Roman city in Santiponce, Andalusia, Spain
A cuddling pair of Taiwan yuhina
27 Oct 2024British Summer Time ends
14 Sep 2024Last Night of the Proms
2 Jul 2025Spine-cheeked anemonefish
Stars in daylight
Singing the blues
Poetry in suspense
How can we help at-risk animals?
16 Jun 2025World Sea Turtle Day
Sunset on Santorini