Skip to main content

Pi Day is a happy day, no matter how you slice it.

The Babylonians first approximated pi in their construction efforts, so pi has a long and worthy history. The Babylonions began by assigning pi = 3, then later adapted that to pi = 3.125.

The Egyptians, in the Rhind Papyrus, gave pi a value of 3.160.

Pi has a lengthy history.

Congress officially designated March 14 as Pi Day in 2009. Jonathan Zuck (president of Association of Competitive Technology) probably had a hand in this decision by quietly delivering pies to colleagues and congressional staffers for several years before the proclamation.  I don't know if he still delivers pies to them or not. I wonder if the congrescritters who voted for it know that it's the mathematical number they were promoting through this proclamation and not fruity pies?

A lot of people celebrate Pi Day with pie, because - pie.

Many-Berry Pies

Because pi is such a popular number, there are a plethora of pi approximation days, as well:

July 22: When 22 is divided by 7, it equals 3.14.
March 4: When 14% of the 3rd month has elapsed.
April 5: When 3.14 months of the year have elapsed.
April 26: The Earth has traveled two radians of its orbit on this day (April 25 in leap years). This is celebrated exactly on the 41st second of the 23rd minute of the 4th hour on April 26 or the 116th day. (In leap years, it is celebrated exactly on the 3rd second of the 2nd minute of the 12th hour on April 25 or the 116th day.)
November 10: The 314th day of the year (November 9 in leap years).
December 21, 1:13 p.m.: The 355th day of the year (December 20 in leap years), celebrated at 1:13 for the Chinese approximation 355/113

Places to read about Pi Day:

Geeking Out on Pi Day

Happy Pi Day

On Pi Day

Pi Day Challenge

Your Email has been sent.
You must add at least one tag to this diary before publishing it.

Add keywords that describe this diary. Separate multiple keywords with commas.
Tagging tips - Search For Tags - Browse For Tags


More Tagging tips:

A tag is a way to search for this diary. If someone is searching for "Barack Obama," is this a diary they'd be trying to find?

Use a person's full name, without any title. Senator Obama may become President Obama, and Michelle Obama might run for office.

If your diary covers an election or elected official, use election tags, which are generally the state abbreviation followed by the office. CA-01 is the first district House seat. CA-Sen covers both senate races. NY-GOV covers the New York governor's race.

Tags do not compound: that is, "education reform" is a completely different tag from "education". A tag like "reform" alone is probably not meaningful.

Consider if one or more of these tags fits your diary: Civil Rights, Community, Congress, Culture, Economy, Education, Elections, Energy, Environment, Health Care, International, Labor, Law, Media, Meta, National Security, Science, Transportation, or White House. If your diary is specific to a state, consider adding the state (California, Texas, etc). Keep in mind, though, that there are many wonderful and important diaries that don't fit in any of these tags. Don't worry if yours doesn't.

You can add a private note to this diary when hotlisting it:
Are you sure you want to remove this diary from your hotlist?
Are you sure you want to remove your recommendation? You can only recommend a diary once, so you will not be able to re-recommend it afterwards.
Rescue this diary, and add a note:
Are you sure you want to remove this diary from Rescue?
Choose where to republish this diary. The diary will be added to the queue for that group. Publish it from the queue to make it appear.

You must be a member of a group to use this feature.

Add a quick update to your diary without changing the diary itself:
Are you sure you want to remove this diary?
(The diary will be removed from the site and returned to your drafts for further editing.)
(The diary will be removed.)
Are you sure you want to save these changes to the published diary?

Comment Preferences

Subscribe or Donate to support Daily Kos.

Click here for the mobile view of the site