## Happy Pi Day 351

Jonathan writes

*"Today, the 14th of March, is Pi Day 2008. Pi Day is internationally celebrated in honor of the mathematical constant "Pi," who's actual value will — now and forever — remain unknown. NeoSmart Technologies has a run-down on the history of Pi, Pi Day, and the significance of Pi and other such "magical numbers" to science and technology. 'Pi isn't just a number that you can use to calculate circle-related mathematics, it's a symbol of something by far greater. Pi is one of many "magic" numbers that are found everywhere — if you know where to look. These magic numbers can't be explained, they just are. And if you use them right, they make it a lot easier to do a lot of really complicated things... In a way, they're a testimony to technology and computers (or vice-versa, depending on how you look at it).'"*
## Happy pi day everyone!! (Score:2)

## Re:Happy pi day everyone!! (Score:5, Funny)

## Re:Happy pi day everyone!! (Score:5, Funny)

## Re:Happy pi day everyone!! (Score:5, Funny)

## Re:Happy pi day everyone!! (Score:5, Funny)

(not what Leroy Jenkins actually said, but it's still the meme.)

## pi's value today (Score:4, Funny)

## Re:Happy pi day everyone!! (Score:5, Funny)

## m/dd/yyyy indeed? (Score:5, Insightful)

So we didn't miss it - but we will be missing it, as none of us are going to be living to be that old.

Then again, this is all based on the current calendar (arbitrary) and how you interpret the numbers (arbitrary) as well as the date/time notation (arbitrary, as pointed out above) ( the last two being related to eachother as there's no, say, 31st of april.)

## Re:m/dd/yyyy indeed? (Score:4, Funny)

-ellie

## Re: (Score:3, Funny)

Just watch out for the kids when you get back to earth.

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## Re: (Score:2, Funny)

So far so good.

## Re: (Score:3, Funny)

(I probably deserve a pi in the face for attempting that pun. (and this one))

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## Not if you are un-American! (Score:2)

Sorry, but we missed Pi day by a longshot.Fortunately for those of us in the rest of the world where we use the more logical d/m/y time ordered notation we still have a couple of thousand years to go: 3/1/4159. It would have been earlier but April only has 30 days!

## Re:Happy pi day everyone!! (Score:4, Funny)

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## Re:Happy pi day everyone!! (Score:5, Funny)

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Or close up the equation with a logical end!

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And I believe it's "unto the breach"

## not me (Score:2)

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## Happy Pi day... (Score:5, Funny)

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(of course, such a cake should be round, unless you are just really REALLY into irony)

## Re:Happy Pi day... (Score:5, Funny)

## Re: (Score:3, Funny)

"Actually, the cake is a Pi."Oh great, not another one of you fools tryin to tell me that pie are square....

## Re: (Score:2)

True story: two of my high school's math teachers used to make sure that we got French Silk pie on Pi Day and 2^10 Day (October 24th [wikipedia.org], of course), with a bit of extra math fun (games, etc.) unrelated to the topic at hand. Sure, it's a bit of a corny idea, but we appreciated that little "extra step" they took to make math more approachable, beyond their excellent guidance.

If you're reading this: thank you, Mr. Petersen and Mr. Morse. You inspired me (and many of my

## Opportunity Missed.. (Score:4, Funny)

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It takes excellent timing to do it at 03:14:59.26535897.....

Even so, I can't wait until 02:06:53.58979 May 9, A.D. 3141. Or should that be March 14, 1592, oh wait, too late. Maybe we can do it at 03:14:15 in '92.

## Wrong day (Score:5, Funny)

## Re:Wrong day (Score:5, Funny)

## Re:Wrong day (Score:5, Funny)

## Re: (Score:2)

22/7 is a better approximation than 3.14

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'course, if you're making subdirectories on a Unix filesystem, using / is handy.

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## Talk Like A Physicist Day (Score:5, Interesting)

## Re:Talk Like A Physicist Day (Score:5, Funny)

## Re:Talk Like A Physicist Day (Score:4, Funny)

## Re: (Score:2)

## Re: (Score:3, Funny)

## Pi-th Post! (Score:5, Funny)

## Unknown value? (Score:5, Informative)

Silly boys.

-ellie

## Re:Unknown value? (Score:5, Funny)

## Re:Unknown value? (Score:5, Insightful)

1.0 (base pi) is still 1 (base anything).

## mod parent up (Score:2)

Good luck ever doing much in base-pi, though...

## Re: (Score:2)

## Re:Unknown value? (Score:4, Informative)

I'm sorry because I know I'm being pedantic, but I've dealt a fair amount with number theory and I felt like I should comment. You can't, strictly speaking, have "base pi" in the way that our number system is "base 10". If you don't quite know why that is the case, ask yourself if you wanted to count to "10" in "base pi" (which would be pi), what would that counting look like?

If you think it would be "1, 2, 3, 10" then you're talking about base 4. Otherwise, the distance on a number line between 0->1, 1->2, and 2->3 would all be equal to one unit, but 3->10 (the next number) would be 0.14159265... units.

The issue of pi being an irrational number, rather, is related to the definition of numbers as geometric ratios (which is how most of our mathematics consider numbers). The problem is that the diameter of a circle and the circumference are incommensurable, meaning that you can never come up with a whole-number ratio between those two lengths. Therefore, you cannot, no matter what length you choose as your unit, measure both the diameter and circumference with the same unit.

As a result, we generally take the diameter to be 1 unit of length, and the length of the circumference to be represented by the irrational number pi units of length. So the "number" of pi is an approximation of the ratio of diameter:circumference. We could just as easily assign the circumference to be the unit, however, and then the measurement usually represented by pi would be represented by "1" (which is what I think the GP post was alluding to). However, this would result in us having to deal with a different irrational number, which would be for representing the diameter, which would be 1/pi.

## Re: (Score:3, Funny)

Many people are known to be irrational, so this shouldn't be impossible.

## Re: (Score:3, Interesting)

You can do non-integer bases, but it gets interesting. Non-rational bases get even more interesting. Maybe not practical for much, and you can't represent the "normal" integers usefully, but it's still a field and all of the abstract algebra still works.

## correction (Score:3, Informative)

PI is exactly the ratio of diameter:circumference, we can only express it as an approximation in our number system.

PI = (ln -1)/(sqrt-1)

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"infinite amount of information"? Only if you're the sort of person who calls

anybigger-than-linear increase "exponential". Words have meanings, and scientific/mathematical words have very precise meanings.Here's a complete representation of the value of \pi:

That's only 368 bits of information, and I'm sure there are more compact encodings of the value.

## Re: (Score:3, Interesting)

BTW, forget the years of college math - I learned late in life that just about anything you'd need is in Cryptonomicon - http://www.cryptonomicon.com/text.html [cryptonomicon.com]

Watch out for June 2 on this evenly-numbered year - that'll be Dick Tracy day!

## Re: (Score:2)

What is it about the symbol for pi that makes it more or less special than the symbol '3', or either of their relationships to the symbol '1'?

There's a whole lot of math you can do using the symbol for pi to stand for the ratio between a circle's radius and circumference. The fact that it doesn't look like the symbols for decimal integers doesn't hurt it any; in fact, for most of

## Re: (Score:2)

That is like saying 1/3 is unknown just because you can't print enough 3's after the decimal place to be accurate.This seems to think that the problem with expressing pi's value involves the use of a decimal number system, when it's actually an inherent difficulty of expressing this value with integers.

## Re:Unknown value? (Score:5, Funny)

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Compare that to the digits of 1/3 = 0.3333... They are pretty well known.

Weather pi is "unknown" or not is kind of an undefined question. By definition it is not. By the cool formulas we know how to get better approximations of it, it is not. By the behavior and dist

## March 14, 2015 (Score:2, Interesting)

## What do you mean by unknown? (Score:5, Informative)

## Re:What do you mean by unknown? (Score:5, Informative)

## Re: (Score:2)

It doesn't make pi any less definite though.I think it does in a sense. Pi is precisely defined: it's the number that you get when you divide the circumference of a circle by its diameter. But that's not its value, that's its definition. And then we say, "Oh and look at all the other places it pops up and all of the other things we can do with it." We can say, it's the number that does

this. It's the one you get when you dothat. But we can't precisely place it on a number line. There is somethin## Obligatory Portal reference (Score:5, Funny)

## grammar day? (Score:4, Funny)

who'sactual value will -- now and forever -- remain unknown.When can we have grammar day? First, it is "whose," as possessive pronouns never use apostrophes. Second, it is not even "whose" because Pi isn't a person.

## Re:grammar day? (Score:4, Funny)

## Re:grammar day? (Score:4, Funny)

Grammar has always been a weak-point

(no hyphen needed)of mine, so it would have been nice if you had finished your thought (assuming your actual goal was NOT just to point out(split infinitive, but that's forgiveable these days)someone else's mistake so you could look clever without actually being helpful).Don't make me go all George Costanza and have to tell you who

(whom: a tricky case this time)the jerk store just ran out of...(Even sentences which end in ellipsis dots need periods!)## Pi Day? Sing it! (Score:3, Interesting)

Lots of songs have been written about Pi Day (Google "Pi Day Songs" to find 'em).

One of the more creative is this rap song (with video) [teachpi.org] to the tune of Eminem's LOSE YOURSELF.

Best enjoyed with a slice of pie. Right, Agent Cooper?

## Re: (Score:2)

This is some DAMN fine pie!

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.

.

.

[Leeland]DANCE WITH ME! DANCE WITH ME![/Leeland]

## Redundant? (Score:2)

## People with "pi" ... (Score:2)

## Re: (Score:2)

Thinking about it though, I probably should have brought in half of a pie, because a whole pie is 2 pi which is overdoing things a bit.

## Magic Numbers?? (Score:2)

Pi is simply the ratio of the circumference of a circle to it's diameter. Where's the magic?

The square root of two is the square root of two. But I guess it's magic.

Did this guy study math at a religious school or something?

## Happy PI day? (Score:2, Funny)

## to Quote Dr. Novella (Score:2)

## freedom day (Score:2)

## alternative representation in modular arithmetic (Score:5, Interesting)

March 14, 15:92:65

The proper representation is modular-place arithmetic. Instead of assuming each number chunk is either decimal or hundreds, you use the actual size of the place. The Calendar places are:

12 months

31 days

24 hours

60 minutes

60 seconds

So 3.14159265 is

3 months, remainder

4 days, remainder

9 hours, remainder

20 minutes, remainder

42 seconds, remainder

In other words March 4 9:20:43

## Re:alternative representation in modular arithmeti (Score:2)

## My company is celebrating Pi day (Score:4, Funny)

at least in the engineering department. We are having pie as a group at 1:59 this afternoon.

BTW, today is also Albert Einstein's birthday.

## International? (Score:3, Funny)

Oh, wait they don't get to celebrate at all!

## Re: (Score:2)

The correct international date format uses the ISO format of yyyy-mm-dd - for pi day, it's 31415926535897932384626433832795028841971693993751058209749445923078164-06-28. Unlike the annual celebration, this one day event is something that you won't forget.

## Re: (Score:3, Funny)

## How did I not remember this? (Score:2)

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## Pi approximation day (Score:3, Funny)

Like this guy:

http://www.qwantz.com/archive/000955.html [qwantz.com]

## Wi? (Score:2)

## These are the real pi moments (Score:2, Informative)

For those of us on 64 bit surely:

is the next pi moment.You 32bit suckers have already passed the last one:

And a long wait for the next pi moment after that:

## 42 (Score:4, Interesting)

## Good book about Pi (Score:3, Interesting)

I found it entertaining and easy to read while at the same being informative/interesting. I feel the book gives a very good presentation of the thought process behind how different civilizations reached their approximation of Pi and a good insight into how brilliant people of different times where able to calculate Pi. I bet a lot of "ordinary" people wouldn't have a clue about how to find a good number for Pi, without hitting their "Pi"-button on a calculator

A good read. Very nice addition to say, your toilet library (I've got one...)

## Remain unknown? What the fsck? (Score:5, Funny)

exactlyequal to the sum of the infinite series 4 - 4/3 + 4/5 - 4/7 + 4/9 - 4/11...rj

## Pi Joke (Score:5, Funny)

Answer: pi*z*z*a

## Re: (Score:2)

Is that too much to ask?

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