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Wizard
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March 14th, 2015 at 6:15:16 AM permalink
I'd like to wish each and every member of WoV a happy pi day. There is extra hoopla about this particular pi day because the first five digits of pi are 3.1415 and today's date is 3/14/15.

What is bothering me is that if we round pi to five decimal places it is 3.1416. So, I submit for the consideration of the forum that we should be having our once in a century pi day blow out next year, on 3/14/16. Or am I just throwing cold water on the celebration, like those annoying perfectionists who complained whenever anybody tried to celebrate the new millennium on 1/1/2000?

The question for the poll is what is your opinion about this pi day?

pi = 3.141592653589793238462643383279502884197169399375105820974944592307816406286
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Mosca
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March 14th, 2015 at 6:23:24 AM permalink
Quote: Wizard

I'd like to wish each and every member of WoV a happy pi day. There is extra hoopla about this particular pi day because the first five digits of pi are 3.1415 and today's date is 3/14/15.

What is bothering me is that if we round pi to five decimal places it is 3.1416. So, I submit for the consideration of the forum that we should be having our once in a century pi day blow out next year, on 3/14/16. Or am I just throwing cold water on the celebration, like those annoying perfectionists who complained whenever anybody tried to celebrate the new millennium on 1/1/2000?

The question for the poll is what is your opinion about this pi day?

pi = 3.141592653589793238462643383279502884197169399375105820974944592307816406286



Or, we could celebrate in about 3 minutes, on 3/14/15 at 9:26:53 AM....
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noy2222
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March 14th, 2015 at 6:29:04 AM permalink
Pi isn't 14.32015
I don't understand why the celebration for something that happened 9 days, 2 months, 423 years ago...
Wizard
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March 14th, 2015 at 6:40:28 AM permalink
The exact moment to pop the champagne would be Mar 14, 2015, at 9:26 AM and 53 or 54 seconds, depending on rounding. If you're doing to celebrate down the second, then today is the day. You won't have another chance to celebrate pi to 10 decimal places for another 100 years. At least by the US date formatting.

pi=3.14159 26535 89793 23846 26433 83279 50288 41971
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odiousgambit
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March 14th, 2015 at 6:43:54 AM permalink
both days should be celebrated

I actually never bothered to memorize pi past 3.14, but now I can't help but know it to 3.1415, and if we celebrate next year too, 3.14159 [edited]

celebrating down to the last second won't help me LOL
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1BB
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March 14th, 2015 at 7:02:55 AM permalink
Happy birthday Albert Einstein.
Many people, especially ignorant people, want to punish you for speaking the truth. - Mahatma Ghandi
miplet
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March 14th, 2015 at 7:15:46 AM permalink
Quote: Wizard

The exact moment to pop the champagne would be Mar 14, 2015, at 9:26 AM and 53 or 54 seconds, depending on rounding. If you're doing to celebrate down the second, then today is the day. You won't have another chance to celebrate pi to 10 decimal places for another 100 years. At least by the US date formatting.

pi=3.14159 26535 89793 23846 26433 83279 50288 41971


Hummmm To stay up another 2 hours to try a pi post at exactly 9:26:54
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Greasyjohn
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March 14th, 2015 at 7:15:57 AM permalink
And I was thinking about starting a Happy Pi day thread.

Woke up this morning and put a piece of pumpkin pie in the microwave for 33 seconds, added some Cool Whip-generic product to the top and had my coffee. I had never even heard of Pi day until 3 days ago. This is a special Pi day. 3.1415. I voted that today is the special Pi day. Sure, if you round it off it's 3.1416. But who said anything about rounding? The fifth digit is a 5. That's all you need to know.

Now, nobody has proven that Pi continues infinitely, have they?
teliot
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March 14th, 2015 at 7:19:35 AM permalink
Quote: Wizard

I'd like to wish each and every member of WoV a happy pi day. There is extra hoopla about this particular pi day because the first five digits of pi are 3.1415 and today's date is 3/14/15.

My goal is to get a screen capture of www.time.gov at 9:26:53 AM. We are hundreds of years past the best pi day of all time, 3/14/1592 at 6:53:58 AM. The sun will supernova long before we can do better.
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Mosca
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March 14th, 2015 at 7:53:12 AM permalink
Quote: Greasyjohn


Now, nobody has proven that Pi continues infinitely, have they?



Proof pi is both irrational and transcendental
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Mosca
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March 14th, 2015 at 7:57:30 AM permalink
Quote: teliot

My goal is to get a screen capture of www.time.gov at 9:26:53 AM. We are hundreds of years past the best pi day of all time, 3/14/1592 at 6:53:58 AM. The sun will supernova long before we can do better.



We could ditch our current calendar and start over. That would be less time consuming than waiting for the supernova.

Can supernovas be predicted? Once a supernova starts, how long does it take? If our sun started supernovaing on pi day, would we live to see the next pi day?
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Sabretom2
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March 14th, 2015 at 8:04:30 AM permalink
Pi is an irrational bigot.
Torghatten
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March 14th, 2015 at 8:14:23 AM permalink
You forgot 22nd of July in your poll. :p
Greasyjohn
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March 14th, 2015 at 9:10:55 AM permalink
Just was reading about how Pi has been proven to be a number without end. Didn't understand it. I googled for an easy explaination and the answer was complicated.
tringlomane
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March 14th, 2015 at 9:20:12 AM permalink
Quote: Greasyjohn

Just was reading about how Pi has been proven to be a number without end. Didn't understand it. I googled for an easy explaination and the answer was complicated.



Many significant math proofs aren't straightforward for most.
miplet
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March 14th, 2015 at 9:26:26 AM permalink
Happy π Day


Ooops ment to hit preview first. Oh well better luck next year.
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teliot
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March 14th, 2015 at 9:29:15 AM permalink
3.141592653

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Dieter
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March 14th, 2015 at 9:35:21 AM permalink
No matter how mathy you folks get, I still prefer to observe the coincidental celebration.
May the cards fall in your favor.
teddys
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March 14th, 2015 at 10:54:43 AM permalink
"Dice, verily, are armed with goads and driving-hooks, deceiving and tormenting, causing grievous woe." -Rig Veda 10.34.4
RS
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March 14th, 2015 at 11:17:35 AM permalink
Wizard.....you're trying to make a case for rounding pi? :(
tringlomane
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March 14th, 2015 at 1:28:48 PM permalink
Quote: Dieter

No matter how mathy you folks get, I still prefer to observe the coincidental celebration.



I prefer to observe the original date for that (at least it was the date when I first heard about it). My birthday, March 20th.
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March 14th, 2015 at 1:34:05 PM permalink
im eating a chocolate pie for this joyous occasion. gonna cut outs small piece and then eat what's left of it.
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rudeboyoi
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March 14th, 2015 at 2:00:29 PM permalink
Pi days a sham. I'll be celebrating tau day.
SOOPOO
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March 14th, 2015 at 2:01:00 PM permalink
In high school I was captain of the math team. Not exactly the thing that lead to many dates.... Anyway, I had a good friend who was a very good artist. We named our team The Bayside Radicals.... He designed a T shirt with the front having the word "Bayside" in a 'radical'.... And as captain I got to wear the number 'pi' on my back. The rest of the team had integers. I played basketball in that shirt for many years until it disintegrated.

In college, the Columbia band had a cheer we would chant before every game....

"E to the x, E to the x, E to the x, dy, dx. Cosine, secant, tangent, sine, 3.14159... fight!
rudeboyoi
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March 14th, 2015 at 2:24:51 PM permalink
Maybe I shouldn't have insulted pi day. I was going to make a pool day of this pi day. I walk down there and find out its closed.
Doc
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March 14th, 2015 at 3:20:48 PM permalink
Quote: RS

Wizard.....you're trying to make a case for rounding pi? :(


Some of us have a preference for round pi....
RS
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March 14th, 2015 at 3:35:27 PM permalink
Round pie? Yeah, it's good stuff.

Round pi? You filthy animal...
Doc
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March 14th, 2015 at 3:45:10 PM permalink
I think the line came in an early Andy Griffith recording when he objected upon hearing someone say, "... πR2...."

His reply: "No! Pie are round; cornbread are square."
98Clubs
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March 14th, 2015 at 11:45:12 PM permalink
pie are round

pi r2
Some people need to reimagine their thinking.
JohnnyQ
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March 15th, 2015 at 1:18:03 PM permalink
And in case you missed pi day, there's always mole day coming up in several months. A couple of the chemists at work were surprised I knew what it was, but that was due to my daughter being in Honors Chem in HS.
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teddys
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March 15th, 2015 at 1:30:00 PM permalink
I was suprised I remembered it too.

6.02 x 10 to the 23rd.
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harvson3
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March 15th, 2015 at 2:52:32 PM permalink
Had dinner last night with a friend who's a number theorist.

He submitted that 3.14 is a worse approximation of pi than is 22/7, which rounds to 3.142857, so from now on pi day ought to be moved to July 22nd after this year (or after 2016, per the Wizard).
Paigowdan
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March 15th, 2015 at 2:54:35 PM permalink
In terms of these mathematical special dates, it was actually Johnny Carson who nailed it,

on none other than at 12:34AM on May 6th, '78, interrupting his Tonight Show to momentarily announce the convergence of this 1-2-3-4-5-6-7-8 "eight-card straight" astronomical event.

Pi is a weaker date-time convergence what the King of late night had done.
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Nareed
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March 15th, 2015 at 3:11:45 PM permalink
Try the date in Spanish. It's not impressive at all.

14/03/15
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AcesAndEights
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March 15th, 2015 at 3:12:20 PM permalink
Quote: Wizard

At least by the US date formatting.


This is my issue with calling this the "Pi day of the century." US date formatting is just plain wrong. There is an international standard, ISO 8601, that describes an unambiguous date format that is preferable to use. So yesterday was 2015-03-14.
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teliot
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March 15th, 2015 at 4:06:13 PM permalink
Quote: harvson3

Had dinner last night with a friend who's a number theorist.

That was my research area as well when I was a professor. Not many of us. At any rate, check out 355/113.
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rudeboyoi
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March 15th, 2015 at 4:39:54 PM permalink
Quote: AcesAndEights

This is my issue with calling this the "Pi day of the century." US date formatting is just plain wrong. There is an international standard, ISO 8601, that describes an unambiguous date format that is preferable to use. So yesterday was 2015-03-14.



Both 2015-3-14 and 14-3-2015 make more sense than the way we do it. From largest to smallest or smallest to largest.
andysif
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March 15th, 2015 at 6:28:48 PM permalink
Quote: rudeboyoi

Quote: AcesAndEights

This is my issue with calling this the "Pi day of the century." US date formatting is just plain wrong. There is an international standard, ISO 8601, that describes an unambiguous date format that is preferable to use. So yesterday was 2015-03-14.



Both 2015-3-14 and 14-3-2015 make more sense than the way we do it. From largest to smallest or smallest to largest.


anyone know the actual rationale behind this MM-DD-YY format? Even when you are saying it verbally, it should have been "1st" of "MAY", "2015"
Dieter
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March 15th, 2015 at 7:09:30 PM permalink
Quote: teliot

check out 355/113.



Thank you. If you're going to celebrate pi, either December 21st (or December 20th), at 1:13.

This approximately coincides with a solstice. Coincidence? I think not.
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teliot
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March 15th, 2015 at 7:26:57 PM permalink
Quote: Dieter

Thank you. If you're going to celebrate pi, either December 21st (or December 20th), at 1:13.

This approximately coincides with a solstice. Coincidence? I think not.

I get it, the 355-th day out of 365 days in the calendar year. Nice.
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Wizard
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March 15th, 2015 at 7:48:43 PM permalink
Quote: teliot

I get it, the 355-th day out of 365 days in the calendar year. Nice.



Nice yourself. I didn't get the reference myself, but was afraid I would look stupid if I asked about it.
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harvson3
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March 15th, 2015 at 7:56:39 PM permalink
Quote: teliot

That was my research area as well when I was a professor. Not many of us. At any rate, check out 355/113.


One of the things he noted was that he reviews papers (for journals) from only about 4-5 other academics that he knows personally, and only they are asked to review his papers, because that's pretty much the number of people in that particular sub-subfield.

I like the new fraction.
teliot
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March 15th, 2015 at 8:02:39 PM permalink
Quote: harvson3

One of the things he noted was that he reviews papers (for journals) from only about 4-5 other academics that he knows personally, and only they are asked to review his papers, because that's pretty much the number of people in that particular sub-subfield.

I like the new fraction.

One time I submitted a paper and the referee called me and said he had been working on the same thing and had proved the same main theorem and was writing it up. I invited him to be a co-author. I then called the editor of the journal and informed him that the reviewer called me so he wouldn't be surprised that the person was added to the paper. What can you do?

The fractions 22/7 and 355/113 come from the convergents in the continued fraction expansion of pi. The next best fraction after 355/113 is 103993/33102. When I was teaching programming at UCSB, I used to give a programming homework assignment to figure out these convergents by brute force.
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Doc
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March 15th, 2015 at 8:07:55 PM permalink
Quote: harvson3

I like the new fraction.

I first saw 355/113 as an approximation of pi as part of a sample problem in the instruction manual for an HP35 calculator I bought back in 1973. The sample problems were for practice in using the RPN data entry system.

The problem suggested an easy way to remember this fraction if it is written as a long division problem (hope the notation looks right to everyone). They said to just write the first three odd digits twice each and separate them with the division symbol, like:

113√355
Dieter
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March 15th, 2015 at 9:13:09 PM permalink
Quote: teliot

The next best fraction after 355/113 is 103993/33102.



355/113 wins, in my opinion, since it's 7 figures of accuracy in only 6 digits, is easy to remember, and fast to key.

103993/33102 is 10 figures accuracy in 11 digits - you do better to punch in 3.1415926535.
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wudged
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March 16th, 2015 at 6:03:50 AM permalink
Quote: andysif

Quote: rudeboyoi

Quote: AcesAndEights

This is my issue with calling this the "Pi day of the century." US date formatting is just plain wrong. There is an international standard, ISO 8601, that describes an unambiguous date format that is preferable to use. So yesterday was 2015-03-14.



Both 2015-3-14 and 14-3-2015 make more sense than the way we do it. From largest to smallest or smallest to largest.


anyone know the actual rationale behind this MM-DD-YY format? Even when you are saying it verbally, it should have been "1st" of "MAY", "2015"



Verbally you may also say "May 1st, 2015"
rudeboyoi
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March 16th, 2015 at 6:26:52 AM permalink
Or May the 1st.
EvenBob
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March 14th, 2016 at 1:36:41 PM permalink
What is PI good for.

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Wizard
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March 14th, 2016 at 2:30:20 PM permalink
Happy pi day, 2016, everybody!!!

May your day be full of the joy and beauty of math!
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EvenBob
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March 14th, 2016 at 5:43:05 PM permalink
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