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.
Pi Day
Today in History
More Desktop Wallpapers:
-
World Otter Day
-
World Poetry Day
-
Back on the rise
-
Haaga Rhododendron Park
-
Flamenco dancers
-
Not your average sandcastle
-
Homeward bound
-
A fair that s star-studded
-
Happy Pi Day!
-
A sea of swirling stone
-
Happy Hobbit Day
-
A house of grand scale(s)
-
The parenting of a piping plover
-
Mandarin duck, Richmond Park, London, England
-
Chilling out in the Arctic
-
Brocken spectre in Central Balkan National Park, Bulgaria
-
Modica, Sicily, Italy
-
A hint of spring
-
Happy Fathers Day!
-
Winter in the Wild West
-
The last thing seen by Wile E. Coyote
-
Abbey Gardens in Bury St Edmunds, England
-
Bird’s-eye view of the Golden Gate Bridge, San Francisco, California
-
Rumelihisarı in Istanbul, Türkiye
-
Golling Waterfall, Salzburg, Austria
-
SantaPark, Lapland, Finland
-
Juniper Springs, Florida
-
Hitsujiyama Park, Saitama Prefecture, Japan
-
Take me to the river
-
Come out of your shell for World Turtle Day