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(CNN)   Pi Day is a fun little diversion (and a great excuse for eating pie), but that little number is actually really, really damn important. Here are just a few of the places where it's used   (lightyears.blogs.cnn.com) divider line 111
    More: Spiffy, iReporter Zeynep Rice, cosmic microwave background, Pi Day, Planetary Science, Wilkinson Microwave Anisotropy Probe, apparent size, colliders, supersymmetry  
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19116 clicks; posted to Main » on 14 Mar 2012 at 8:43 PM (2 years ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2012-03-14 08:42:12 PM  
uploads.neatorama.com
 
2012-03-14 08:47:11 PM  
images5.cpcache.com

/best pi
 
2012-03-14 08:47:58 PM  
It's exactly 3.
 
2012-03-14 08:48:58 PM  
Let's say you know how much mass the Earth has, and you want to figure out what the strength of gravity is at some distance away. Newton's equation tells you what that force is - it's proportional to one divided by the distance squared (the famous "inverse square law"). But let's say you want to do the opposite - you know what the force is, but you want to figure out how much mass is causing it.

You could draw a sphere that completely surrounds the object, and add up the gravitational force at each point on the sphere, to make sure you are correctly capturing what's going on inside. So the answer to one question is related to the answer to the other, by adding up things all over a sphere. And the area of a sphere of radius R is 4pi R2. Voila - pi comes into the expression, because pi relates distances (straight lines) to spheres.


bucultureshock.com
 
2012-03-14 08:48:58 PM  
www.frontroomcinema.com
 
2012-03-14 08:49:40 PM  
It's Half-Tau Day, dagnabbit.
 
2012-03-14 08:49:42 PM  
Nobody celebrates e day and that makes me sad. Pi gets all the fame.

/Feb 71st.
 
2012-03-14 08:51:31 PM  
also, the number of weird f-ing places that the number pi appears in is just astounding.

For instance,

Eqn. 5 and below of this link
weird pi formulae (new window)
 
2012-03-14 08:54:00 PM  
img37.imageshack.us
 
2012-03-14 08:54:20 PM  
img171.imageshack.us
The pie-r-square
 
2012-03-14 08:54:28 PM  
And if you take it out to enough decimal places, it turns into binary and forms a circle.

/nothing is obscure.
 
2012-03-14 08:54:32 PM  

chard: also, the number of weird f-ing places that the number pi appears in is just astounding.

For instance,

Eqn. 5 and below of this link
weird pi formulae (new window)


I don't know what any of that was, but it made my head hurt.
 
2012-03-14 08:58:00 PM  
img24.imageshack.us

"Hair pie! Hair pie!"
 
2012-03-14 08:58:15 PM  
i306.photobucket.com
 
2012-03-14 08:59:54 PM  
Guarantee that you use a device that uses pi as a critical component each and every day.
 
2012-03-14 09:00:57 PM  
And places where it's not:

The biblee
Indiana legislature
 
2012-03-14 09:01:02 PM  
My son was singing a song about pi on the way home from school today. Then he explained a bit about how it is used and how, really it isn't just 3.14, but that's the shortcut version.
 
2012-03-14 09:01:36 PM  
wait, I thought today was Steak and a Blowjob Day?

theboxhouston.com
 
2012-03-14 09:04:34 PM  
Tried to get in before the tau-ists and failed.
 
2012-03-14 09:05:44 PM  
IIRC, something like only 30 digits of pi are enough to calculate the circumference of the universe with a margin of error smaller than a hydrogen atom.
 
2012-03-14 09:06:04 PM  
farking magnets, how do they work?

Apparently pi.
 
2012-03-14 09:06:31 PM  
And my little daughter is taking this article in for her current event next week. Thank-you, submitter.
 
2012-03-14 09:06:59 PM  

egomann: And if you take it out to enough decimal places, it turns into binary and forms a circle.

/nothing is obscure.


In base 11.
 
2012-03-14 09:08:12 PM  
Teacher: The area of a circle?
Mary: pi r squared
You: Not so! pie are round, cornbread are square.
 
2012-03-14 09:09:32 PM  

Mildot: wait, I thought today was Steak and a Blowjob Day?

[theboxhouston.com image 416x480]


much better than the alternative, tofu and analingus day.

/ that can be reserved for tau day.
 
2012-03-14 09:09:42 PM  
Tau > pi.

Pi still > Tebow though.
 
2012-03-14 09:12:40 PM  
Saw this sign at Rockefeller university, last time I saw it was 2006:

pull.imgfave.netdna-cdn.com

(suspect this isn't the actual sign from RU)
 
2012-03-14 09:12:56 PM  

LazarusLong42: Tau > pi.

Pi still > Tebow though.


images1.wikia.nocookie.net

Yes, Tau are better than Tebow
 
2012-03-14 09:16:35 PM  
i love that two random integers being relative primes is 6/pi2 something that apparently has nothing to do with circles. have any mathematicians come up with a link?
 
2012-03-14 09:18:38 PM  
I'm celebrating by making chicken and ham pie. I expect it to be delicious. Though I'm making it square just to be a biatch.
 
2012-03-14 09:20:03 PM  
 
2012-03-14 09:20:35 PM  
And now, having actually read the article, it occurs to me that this article was basically "Hey, pi appears in all these equations related to circles and spheres! That's totally amazing and likely completely unrelated to the fact that pi is defined based on circles and spheres!"

/headdesk
 
2012-03-14 09:24:37 PM  

LarryDan43: It's exactly 3.


You wanna make us get irrational all up in this biatch?
 
2012-03-14 09:24:38 PM  
When is Cake Day?
 
2012-03-14 09:24:44 PM  

LazarusLong42: And now, having actually read the article, it occurs to me that this article was basically "Hey, pi appears in all these equations related to circles and spheres! That's totally amazing and likely completely unrelated to the fact that pi is defined based on circles and spheres!"

/headdesk


'cept the one i mentioned above
 
2012-03-14 09:26:49 PM  
I'm refusing to acknowledge Pi Day until March 14, 2015,

/always gotta be one asshole, right? :P
 
2012-03-14 09:32:59 PM  
Damn, I was just thinking about posting the significance of pi day in three years.
 
2012-03-14 09:33:02 PM  
It's almost like it was........intelligently designed.
 
2012-03-14 09:33:12 PM  
sphotos.xx.fbcdn.net
 
2012-03-14 09:35:44 PM  
Pi day never happens (31/4). Not sure what the fuss is all about for 14/3.
 
2012-03-14 09:37:34 PM  

HaywoodJablonski: Pi day never happens (31/4). Not sure what the fuss is all about for 14/3.


You can celebrate pi approximation day on 22/7.
 
2012-03-14 09:37:59 PM  

Veritas: I'm refusing to acknowledge Pi Day until March 14, 2015,

/always gotta be one asshole, right? :P


I wonder what amazing party was thrown on Pi Day in 1592 (at 6:53am)
 
2012-03-14 09:38:32 PM  

egomann: And if you take it out to enough decimal places, it turns into binary and forms a circle.

/nothing is obscure.


I read that book too. Better than the movie.
 
2012-03-14 09:39:18 PM  
BORING
 
2012-03-14 09:39:28 PM  

flaminio: HaywoodJablonski: Pi day never happens (31/4). Not sure what the fuss is all about for 14/3.

You can celebrate pi approximation day on 22/7.


Nice
 
2012-03-14 09:41:16 PM  
Tau is much better than Pi for people who know a little math but not that much.
 
2012-03-14 09:41:47 PM  
This guy recited Pi from memory to over 22000 digits (new window)

And there's a bonus hot presenter interviewing him
 
2012-03-14 09:43:07 PM  
www.smbc-comics.com
 
2012-03-14 09:45:45 PM  
1Kg = (pi^e)/10 - 1/(pi^e) Lbs


/Accurate to within a gram or so.
 
2012-03-14 09:46:16 PM  
I was waiting for a PI day thread all day at work to waste some time, but it never came. Now that I'm home from work and there's no more need for PI like distraction, the thread comes out. :(
 
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