3/14 is the day to celebrate the ratio of the circumference of a circle to its diameter.
And here is pi:
Click the picture for more detail.
The first time a day was dedicated to pi was on March 14, 1989 at the Exploratorium, a museum of science, art and human perception in San Francisco. The idea was the brainchild of Larry Shaw, a physicist at the center. On March 12, 2009, the U.S. House of Representatives passed a non-binding resolution (HRES 224), recognizing March 14, 2009, as National Pi Day.
Pi Day is celebrated by performing pi-related activities; some serious and some less so, such as creating pi puns; baking, throwing and eating pies; and singing pi songs.
Japanese piphilology has countless mnemonics based on punning words with numbers. This is especially easy in Japanese because there are two or three ways to pronounce each digit, and the language has relatively few phonemes to begin with. For example, to 31 decimal places:
|There are even pi-ems composed to aid memorizing the digits of pi:|
Sir, I send a rhyme excelling,
|Katharevousa (archaizing) Greek
Yielding π to 22 decimal places:
Ἀεὶ ὁ Θεὸς ὀ Μέγας γεωμετρεῖ,
τὸ κύκλου μῆκος ἵνα ὁρίσῃ διαμέτρῳ,
παρήγαγεν ἀριθμὸν ἀπέραντον,
καὶ ὅν, φεῦ, οὐδέποτε ὅλον θνητοὶ θὰ εὕρωσιTranslation:
The Great God applies geometry forever;
To define the length of the circle using its diameter,
He produced an infinite number,
Which, alas, mortals will never find in its entirety.
This is close to being ungrammatical nonsense, but a loose translation prioritizing word order yields:
A person is one; the world is one:
to live this way, it’s meaningless, one says, and cries,
“step on it, will ya!” then reads—be the same!
Crying uncontrollably in the dark.