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Happy Pi Day

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).'"

68 of 351 comments (clear)

  1. Happy pi day everyone!! by Brian+Gordon · · Score: 2

    Happy pi day :) :)

    1. Re:Happy pi day everyone!! by Brainless · · Score: 4, Funny

      Screw Pi day, come on Steak-n-BJ Day!

    2. Re:Happy pi day everyone!! by eln · · Score: 5, Funny

      Sorry, but we missed Pi day by a longshot. Having Pi day on any old 3/14 lacks sufficient precision. Pi day was on March 14, 1592. Pi second would have been March 14, 1592 at 6:53 and 58 seconds in the morning. I'm sure they were partying like it was 1599 on that day.

    3. Re:Happy pi day everyone!! by Naughty+Bob · · Score: 2, Funny

      This should have been posted at 1h59m26s past midnight.

      --
      "Be light, stinging, insolent and melancholy"
    4. Re:Happy pi day everyone!! by XxtraLarGe · · Score: 5, Funny

      Screw Pi day, come on Steak-n-BJ Day! I'm married, you insensitive clod!
      --
      Taking guns away from the 99% gives the 1% 100% of the power.
    5. Re:Happy pi day everyone!! by hansamurai · · Score: 5, Funny

      Tomorrow is the Ides of March, where I will pretend I'm well versed in Shakespeare.

    6. Re:Happy pi day everyone!! by ArcherB · · Score: 4, Funny

      Screw Pi day, come on Steak-n-BJ Day! I'm married, you insensitive clod! Then I guess you are looking forward to chicken and masturbation day!

      --
      There is no "I disagree" mod for a reason. Flamebait, Troll, and Overrated are not substitutes.
    7. Re:Happy pi day everyone!! by PlatyPaul · · Score: 3, Funny

      Sadly, I used to live in a state where every day in March was nearly Pi Day....

      --
      Misery loves company. Online misery loves unsuspecting random strangers.
    8. Re:Happy pi day everyone!! by lgw · · Score: 5, Funny

      "At least I got chicken."

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

      --
      Socialism: a lie told by totalitarians and believed by fools.
  2. Happy Pi day... by bugnuts · · Score: 4, Funny

    ... No cake for you!

    1. Re:Happy Pi day... by Brian+Gordon · · Score: 3, Funny

      The cake is a lie.

    2. Re:Happy Pi day... by electricbern · · Score: 5, Funny

      Actually, the cake is a Pi.

      --
      alias possession='chmod 666 satan && ls /dev > il && tail daemon.log'
    3. Re:Happy Pi day... by MobileTatsu-NJG · · Score: 2, Funny

      "Actually, the cake is a Pi."

      Oh great, not another one of you fools tryin to tell me that pie are square....

      --

      "I like to lick butts!" by MobileTatsu-NJG (#32700246) (Score:5, Informative)

  3. Opportunity Missed.. by fictionpuss · · Score: 3, Funny

    To post this story at 1:59pm, or 12 hours earlier depending upon which clock you prefer.

    1. Re:Opportunity Missed.. by Brian+Gordon · · Score: 2, Insightful

      It's already 3/14, that's why you celebrate it at 1:59.. 3/14 1:59

    2. Re:Opportunity Missed.. by davidwr · · Score: 2, Insightful

      3.1415926535897932384626433832795

      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.

      --
      Knowledge is how to play a game, intelligence is how to win, wisdom is knowing what game to play.
  4. Wrong day by Ed+Avis · · Score: 4, Funny

    Surely 22/7 would be pi day.

    --
    -- Ed Avis ed@membled.com
    1. Re:Wrong day by OrangeCowHide · · Score: 2, Insightful

      Most of the world (non-US) writes 22/7. They also write 14/3. So why is this international Pi day?

      --
      Creationists are a lot like zombies. Slow, but powerful and numerous. And they all want to eat our brains. - Evilest Doe
    2. Re:Wrong day by eln · · Score: 4, Funny

      Sorry, 22/7 is only approximately pi day.

    3. Re:Wrong day by Brian+Gordon · · Score: 2, Funny

      Nope, that's pi approximation day.

    4. Re:Wrong day by Neko-kun · · Score: 3, Informative

      That's why my files get dated YYYY/MM/DD so as to avoid any unnecessary confusion. Makes it easier to sort too:D

    5. Re:Wrong day by Ed+Avis · · Score: 3, Informative

      YYYY-MM-DD would be better; the different delimiter character avoids confusion with other date formats. This is the standard date and time notation.

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

      --
      -- Ed Avis ed@membled.com
    6. Re:Wrong day by Hillgiant · · Score: 5, Funny

      Everyday is approximately pi day. Just some approximations are better than others.

      --
      -
    7. Re:Wrong day by fbjon · · Score: 2, Insightful

      Indeed, descending order of significance is the only order that makes sense. All other systems are local perversions.

      --
      True confidence comes not from realising you are as good as your peers, but that your peers are as bad as you are.
  5. Talk Like A Physicist Day by klossner · · Score: 4, Interesting
    In addition to being Pi Day, today is Einstein's Birthday and Talk Like A Physicist Day:

    Never say "I didn't sleep enough" - the correct way to say it is "It was observed that my sleep duration was less than average." Or (In Plank units), "I have a sleep deficiency of about ten to the power 47, which is about half an hour."
    1. Re:Talk Like A Physicist Day by Dun+Malg · · Score: 4, Funny

      (In Plank units) Aren't plank units Board-Feet?
      --
      If a job's not worth doing, it's not worth doing right.
    2. Re:Talk Like A Physicist Day by dreamchaser · · Score: 2, Funny

      The evidence at hand would seem to indicate that your verbage is non standard for a physicist. It fits the template of a pirate with insomnia, though. Without further data I am only speculating of course.

    3. Re:Talk Like A Physicist Day by Joe+Snipe · · Score: 3, Funny

      I believe you mean bohred-feet.

      --
      Sometimes, life itself is sarcasm...
  6. Pi-th Post! by eldavojohn · · Score: 4, Funny

    Bask in its glory!

    --
    My work here is dung.
  7. Unknown value? by ElizabethGreene · · Score: 5, Informative

    I would not say that it has an unknown value, the value is known as the ratio of a circle's diameter and circumference. Just because our system of representing numbers is flawed in that it cannot accurately define numeric sequences that approach infinity doesn't mean it is unknown... That is like saying 1/3 is unknown just because you can't print enough 3's after the decimal place to be accurate.

    Silly boys.

    -ellie

    1. Re:Unknown value? by fred+fleenblat · · Score: 4, Funny

      The value of pi can be precisely expressed as 1.0 (in base pi).

    2. Re:Unknown value? by excelblue · · Score: 5, Insightful

      Don't you mean 10 (base pi)?

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

    3. Re:Unknown value? by phliar · · Score: 2, Insightful

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

      4\sigma_{k=1}^\infinity\frac{(-1)^{k+1}}{2k-1}

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

      --
      Unlimited growth == Cancer.
    4. Re:Unknown value? by nine-times · · Score: 3, 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.

    5. Re:Unknown value? by dpilot · · Score: 2, Funny

      Don't you just need an irrational number of fingers, or do the fingers themselves have to be irrational, as well?

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

      --
      The living have better things to do than to continue hating the dead.
    6. Re:Unknown value? by earlymon · · Score: 2, Interesting

      I think this representation will help - http://www.cryptonomicon.com/images/p15.gif

      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

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

      --
      Pathological kinda promises Path + Logical - but instead, you get stuck with pathetic.
    7. Re:Unknown value? by lgw · · Score: 2, Interesting

      You can't do *discrete* math base pi, but there's plenty of other math you can do.

      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.

      --
      Socialism: a lie told by totalitarians and believed by fools.
  8. March 14, 2015 by andrewd18 · · Score: 2, Interesting

    March 14, 2015 is going to be awesome. I think we should all coordinate our time off and have city-wide festivals (feastivals!) celebrating pi while eating ungodly amounts of it.

  9. What do you mean by unknown? by A+beautiful+mind · · Score: 4, Informative

    who's actual value will -- now and forever -- remain unknown
    Pi's value is known totally precisely, it is just that an irrational number cannot be represented using the good ol' rational numbers or any x/y form of them, it only can be approximated. That is why it is called an irrational number! It doesn't make pi any less definite though.
    --
    It takes a man to suffer ignorance and smile
    Be yourself no matter what they say
    1. Re:What do you mean by unknown? by Xcott+Craver · · Score: 4, Informative

      Pi's value is known totally precisely
      Indeed, pi is exactly (ln -1)/(sqrt -1).
    2. Re:What do you mean by unknown? by CalvinTheBold · · Score: 2, Informative

      Not exactly. I see what you are trying to do, though.

      The problem with trying to write ln(e^(pi*i)) = ln(-1) is that the natural logarithm function defined over the complex numbers has a branch cut along the negative x-axis. Anywhere along that line, ln is not a single-valued function. One may alternately say that ln is holomorphic for all complex numbers whose imaginary part is nonzero, or whose imaginary part is zero and real part is positive.

      This is why ln(x) is undefined for all x 0.

      --
      Try using a zero-knowledge proof to show you don't know anything!
  10. Obligatory Portal reference by imbaczek · · Score: 4, Funny

    The Pi is a lie.

  11. m/dd/yyyy indeed? by Animaether · · Score: 4, Insightful

    In the universally preferred notation (except for those who take being non-conformist to absurd levels), you'll mean the year 3141, May 9th at 2:53.58am in the morning.

    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.)

    1. Re:m/dd/yyyy indeed? by ElizabethGreene · · Score: 4, Funny

      None of us are going to be living? Speak for yourself. I just penciled it in the date on my calendar! (I'm signed up for Cryonics.)

      -ellie

    2. Re:m/dd/yyyy indeed? by bishiraver · · Score: 2, Funny

      Have fun having your mind dumped into the body of a criminal in order to pilot a Bussard ramjet to seed far-off planets with terraforming modules!

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

    3. Re:m/dd/yyyy indeed? by calebt3 · · Score: 2, Funny

      I plan on living forever.
      So far so good.

    4. Re:m/dd/yyyy indeed? by djimi · · Score: 2, Insightful

      You forgot to mention something even more arbitrary, the decimal system. 3.1415926535 really has no significance in the universe.
      Neither does 11.00100100001111110110 (binary) nor 3.243F6A8885A308D31319 (hexadecimal)
      The equation pi = c/d is what is true and real (and irrational - but I digress.)

      --
      Vox et praetera nihil
    5. Re:m/dd/yyyy indeed? by MemoryAid · · Score: 2, Funny
      You stopped short of claiming that pi, itself, was arbitrary. At least you are being rational.

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

      --
      Language students: Don't try to learn English here. This ain't it.
  12. grammar day? by Speare · · Score: 3, Funny

    Pi Day is internationally celebrated in honor of the mathematical constant "Pi," who's actual 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.

    --
    [ .sig file not found ]
    1. Re:grammar day? by rucs_hack · · Score: 3, Funny

      For using the term 'possessive pronouns' in a slashdot post, you win one internet. Please spend it wisely.

    2. Re:grammar day? by gardyloo · · Score: 3, Funny

      If you are going to point out an error, at least take the time to provide an example of the correct grammar.

      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!) :)
  13. Pi Day? Sing it! by WebGangsta · · Score: 2, 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) to the tune of Eminem's LOSE YOURSELF.

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

  14. Happy PI day? by ForestGrump · · Score: 2, Funny

    Yea maybe you are happy, but I'm 3.14ssed!

    --
    Is it true that more people vote for the winner of American Idol, than vote for the president? -Ali G.
  15. alternative representation in modular arithmetic by peter303 · · Score: 4, Interesting

    This schema fails if you continue to minutes and seconds:
    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 .14159265 months
    4 days, remainder .3893706 days
    9 hours, remainder .3448944 hours
    20 minutes, remainder .693664 minutes
    42 seconds, remainder .61984 seconds

    In other words March 4 9:20:43

  16. My company is celebrating Pi day by irenaeous · · Score: 3, 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.

  17. pi's value today by Lucas123 · · Score: 3, Funny

    My favorite part about this pi calculator are the two words at the end.

  18. International? by genka · · Score: 2, Funny

    3/14 sound more like American Pi day. In most other places it is 31/4.
    Oh, wait they don't get to celebrate at all!

    1. Re:International? by bckrispi · · Score: 2, Funny

      3/14 sound more like American Pi day.
      This one time, at Math camp...
      --
      Xenon, where's my money? -Borno
  19. Pi approximation day by popmaker · · Score: 2, Funny

    I'm saving the pie for "pi approximation day" which is the 22. of july (22/7 = 3.1428571428).

    Like this guy:
    http://www.qwantz.com/archive/000955.html

  20. These are the real pi moments by Anonymous Coward · · Score: 2, Informative

    For those of us on 64 bit surely:

    date -d @3141592653
    Sat Jul 20 20:37:33 EDT 2069
    is the next pi moment.

    You 32bit suckers have already passed the last one:

    date -d @314159265
    Sat Dec 15 21:27:45 EST 1979

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

    date -d @31415926535
    Sat Jul 13 02:15:35 EDT 2965
  21. I went to school with nerds. by JoshOOOWAH · · Score: 2, Interesting

    Cosine Secant Tangent Sine! Three Point One Four One Five Nine!

  22. 42 by Nathrael · · Score: 4, Interesting

    Hm, just by the way, already noticed that Pi multiplied with 13,37 is approximately 42? Mathematics definitely play an important role for solving the answer to life, the universe, and everything...

    --
    A good education is a bit like a STD - it makes you unsuitable for a lot of jobs and gives you a desire to spread it.
  23. Good book about Pi by -noefordeg- · · Score: 2, Interesting

    Not sure if anyone has mention this book (link : http://www.amazon.co.uk/History-Pi-Petr-Beckmann/dp/0312381859/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1205526089&sr=8-1 )
    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...)

  24. Remain unknown? What the fsck? by Deadstick · · Score: 4, Funny
    Pi is exactly equal to the sum of the infinite series 4 - 4/3 + 4/5 - 4/7 + 4/9 - 4/11...

    rj

  25. Pi Joke by lenmaster · · Score: 5, Funny

    What is the volume of a pizza of radius z and thickness a?

    Answer: pi*z*z*a

  26. Hard 'n Phirm by Kal+Zekdor · · Score: 2, Interesting
    http://youtube.com/watch?v=mDu351QNoZE

    Your ever-constant homily says flaw is discipline.
    The patron saint of imperfection frees us from our sin.
    And if our transcendental lift shall find a final floor,
    Then Man will know the death of God where wonder was before.
    Enjoy Pi day as it should be enjoyed.
  27. correction by geekoid · · Score: 2, Informative

    "pi is an approximation of the ratio of diameter:circumference"

    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)

    --
    The Kruger Dunning explains most post on /. http://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect