Pi Day Mar 14, 2022

Did Neolithic humans build this structure to celebrate Pi Day? Not likely. Pi Day is a relatively recent phenomenon—invented by a physicist in 1988 and designated by Congress a national holiday in 2009. But it"s already almost certainly the most popular holiday celebrating a mathematical constant. While Pi Day is a young tradition, the number π (pi) itself has been a fascination since antiquity, when it was first calculated as the ratio of a circle"s circumference to its diameter.

© Guy Edwardes/Minden Pictures

palette

Today in History

Mar 14, 2018Happy Pi Day!
Mar 14, 2019Rocky mountain pi
Mar 14, 2020A circular celebration
Mar 14, 2021Perfect timing
Mar 14, 2023Pi Day
Mar 14, 2024Happy Pi Day!
Mar 14, 2025Celebrating Pi Day

More Desktop Wallpapers:

Nov 10, 2023Badlands National Parks 45th anniversary
Apr 5, 2024The Bahamas
Dec 3, 2025Sandhill cranes, Bosque del Apache National Wildlife Refuge, New Mexico
Oct 28, 2020A grotesque scene
Jan 1, 2020Napping away New Year s Day
Jun 22, 2025World Rainforest Day
Jul 29, 2019A picture-perfect day on Trillium
Oct 29, 2022Sea Slug Day
Apr 1, 2018Happy Easter from the ‘peeps’ at Bing
Feb 8, 2023Uredd Rest Area, Norway
Apr 4, 2021A yearly sign that spring has sprung
May 17, 2024Endangered Species Day
Oct 26, 2021Red fox
Mar 7, 2021Finding a balance between wetlands and water treatment
Feb 11, 2018Te Rewa Rewa Bridge near New Plymouth, New Zealand
Dec 3, 2021Frost on autumn leaves
Mar 1, 2019Forward-thinking women of history
Dec 16, 2019Cape Town at dusk
Aug 15, 2018Best. Holiday. Ever.
Mar 14, 2025Celebrating Pi Day
Aug 9, 2024International Day of the Worlds Indigenous Peoples
Jul 16, 2020Summertime in Alaska
May 29, 2022Hyalite Creek at Custer Gallatin National Forest, Montana
Jul 28, 2019Road-trip worthy attraction in the heartland
Apr 13, 2024Apple trees in spring, Germany
Nov 21, 2018A showcase for future fame
May 5, 2020A courtyard scene from Spain
Jul 17, 2019Nomads of the Gobi
Nov 26, 2023Fallow deer, Bradgate Park, Leicestershire, England
Jan 8, 2026Starling murmuration over the ruins of Brightons West Pier, England