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:

1 Jul 2024Canada Day
Trunks packed for the road
31 Jul 2024Hoodoos, Sunset Point, Bryce Canyon National Park, Utah, USA
23 May 2025World Turtle Day
9 Jul 2024Talampaya National Park, Argentina
Halfway there
24 May 2024European Day of Parks
11 Nov 2024Banff National Park, Alberta, Canada
22 Nov 2023Grand Teton National Park, Wyoming, USA
5 Oct 2023World Teachers Day
30 Dec 2025Whooper swans, Kotoku Pond, Japan
15 Feb 2025Kingfisher
9 Jan 2025Sossusvlei sand dunes, Namib desert, Namibia
Stop and smell the Sakura
23 Mar 2025World Meteorological Day
Where is this historical bridge?
3 Apr 2024Newcastle Upon Tyne, England
27 Feb 2024International Polar Bear Day
28 Feb 2024Bamburgh Castle, Northumberland, England
30 Jan 2024Aýna, Albacete, Spain
A sky full of stars
From victory to festivity
Sep 7, 2023Camels in the desert, United Arab Emirates
8 Feb 2026Corfu, Greece
8 Jan 2026Tufted titmouse, Massachusetts, United States
Babbling on and on
19 May 2024Vernazza, Cinque Terre, Liguria, Italy
4 Jan 2025Bản Giốc – Detian Falls, Vietnam
3 Dec 2025Sandhill cranes, Bosque del Apache National Wildlife Refuge, New Mexico, USA
11 Jun 2025Greater flamingos, Lüderitz, Namibia