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.
Celebrating Pi Day
Today in History
More Desktop Wallpapers:
-
World Environment Day
-
Apples ready for harvest, Minnesota, United States
-
Silent night, sparkling lights and hearts full of joy
-
Skipper butterfly on an Echinacea flower
-
Corona Arch near Moab, Utah, United States
-
Saint Davids Day
-
Bathing boxes at Brighton Beach, Australia
-
Ride the wave
-
Annas hummingbird
-
Why are blackbirds tied to winter?
-
Darwin Day
-
Hogmanay
-
Single file, please!
-
Beech trees and anemone wildflowers, Jutland, Denmark
-
Red deer stag in Glen Affric, Scotland
-
The bears and the bees…
-
Warm light through an ancient forest
-
Aït Benhaddou, Morocco
-
Newcastle Upon Tyne, England
-
Striated heron on a Victoria water lily, Pantanal, Brazil
-
One on land, a million in space
-
Marine Day, Japan
-
Hangin around
-
International Rock Day
-
The mystery of Stonehenge
-
Aqueduct, Arkadia Park, Poland
-
Kochia, Hitachi, Ibaraki Prefecture, Japan
-
Celebrating Charles Darwin
-
Cowes Week
-
Grand Teton National Park, Wyoming, USA