[HN Gopher] Pi Day
___________________________________________________________________
Pi Day
Author : throw0101b
Score : 130 points
Date : 2024-03-14 10:39 UTC (12 hours ago)
(HTM) web link (en.wikipedia.org)
(TXT) w3m dump (en.wikipedia.org)
| surprisetalk wrote:
| Woohoo! We're halfway to Tau Day
|
| [1] https://tauday.com
| lifthrasiir wrote:
| Halfway to the Tau Day (179th or 180th day of year) is March
| 29th or 30th depending on your definition of "halfway". Pi day
| is only 73rd or 74th day of year.
| OJFord wrote:
| tau day being the 180th day of the year is either perfect or
| incredibly confusing!
| tempodox wrote:
| t = 2p, so you're off by a factor of 2.
| mikewarot wrote:
| and only 6 more days until #HoosierPiDay, 3/20 ;-)
| ninju wrote:
| For those that need more context
|
| "On Feb. 6, 1897, Indiana's state representatives voted to
| declare _3.2_ the legal value of pi "
|
| https://www.forbes.com/sites/kionasmith/2018/02/05/indianas-.
| ..
| karmakaze wrote:
| Yes I feel so embarrassed if we're beeping out Pi and the
| message is received and decoded with the aliens thinking
| "They're still sending _< what they call Tau>_ / 2". Imagine if
| we received a transmission of e/2. And what is our fascination
| with base-10 representation of Tau/2 digits anyway?
| ipsum2 wrote:
| Google has a cute pi day Easter egg on the search calculator.
| Dalewyn wrote:
| I see your Pi Day and raise you White Day[1].
|
| [1]: https://en.wikipedia.org/wiki/White_Day
| borlox wrote:
| a) 3/14 = 0.21428571428 b) If I take reasonable date formats,
| it's date 2024-03-14 = 2007 today
|
| But kudos for only taking the first three digits, 3.14, as
| approximation for pi, which is in nearly all cases enough. Some
| friends in automotive engineering even tried using pi = 3 and
| 2*pi = 7 for a while, and the results were good enough.
| lifthrasiir wrote:
| You also have 22nd July the pi approximation day, which is also
| mentioned in Wikipedia and much more accurate.
| saalweachter wrote:
| And November 10th (November 9th, this year), as the 314th day
| of the year.
|
| You can find quite a few excuses to eat pie.
| CharleFKane wrote:
| I generally do not need an excuse to eat pie.
|
| Your mileage may vary.
| mavhc wrote:
| Much more? Or slightly more.
|
| If the number of digits in x/y and number in a decimal
| version are the same, the accuracy is approximately equal
| eigenket wrote:
| 2*pi = 7 is impressive, given that 6 would be closer. Thats
| dedication to having bad approximations haha.
| mzd348 wrote:
| > Some friends in automotive engineering even tried using pi =
| 3
|
| Did they end up with engine cylinders that were hexagonal in
| cross-section?
| hyperdimension wrote:
| As one of my math teachers would remind me, don't forget about 22
| June, Pi Approximation Day!
| throwaway_5753 wrote:
| July 22 I think
| saalweachter wrote:
| You 1-based indexing people.
| madcaptenor wrote:
| 0-based indexing would celebrate in August.
| saalweachter wrote:
| Who said anything about 0-based indexing?
| vel0city wrote:
| I start counting everything at two, 'cause I'm always
| number one!
| hyperdimension wrote:
| Aw, bummer. You're right of course.
| voidUpdate wrote:
| Ever year, Matt Parker calculates pi, and this year it was the
| largest manual effort to calculate pi in a very long time[1] . I
| took part this year, though I didn't end up in the video sadly.
| It was lots of fun though, and a nice trip to london
|
| [1] https://youtu.be/LIg-6glbLkU
| fdgjgbdfhgb wrote:
| I was there too! It was such a nice vibe :^D
| rrrpdx503 wrote:
| I put together an iPhone app that guides you through all the
| steps needed to compute Pi to 100 decimal places. Surprisingly
| enough, this doesn't require any complex math -- just basic
| addition, subtraction, multiplication and long division. The
| hardest part is verifying your intermediate results, and the
| app will do that for you. In testing it, I've been able to
| compute about 40 digits by hand. The way I look at it, some
| people climb mountains, and others run marathons... I figured
| it'd be an interesting challenge to see if I could calculate Pi
| by hand.
|
| https://apps.apple.com/us/app/pi-100-challenge/id6475694538
| d--b wrote:
| It's in today's NYT connections puzzle:
|
| https://www.nytimes.com/games/connections
| 4ggr0 wrote:
| I love the NYT Connections game, but some days it makes me feel
| like an absolute idiot because I can't get a single group
| correct and am puzzled when the solutions are revealed :D
|
| Together with globle, travle, worldle, framed and gamedle these
| couple of games are what I play during my morning coffe break,
| and I'm glad that they exist.
|
| If I feel like more I also try to solve boxofficegame and
| tradle, but I can't solve them often.
| dkdbejwi383 wrote:
| A lot of them need knowledge of USA culture and American
| English phrases. That's usually what I fail on.
| 4ggr0 wrote:
| Yeah that's true, was an issue on todays Connections as
| well :/
| NeoTar wrote:
| Watching a lot of American television, I'm normally OK, but
| what got me recently in connections is that apparently
| Jelly Beans are associated with Easter in the USA... that
| was a completely new revelation to me.
| brk wrote:
| Add Dadagrams to your list: https://dadagrams.com/
|
| No affiliation, it was posted to HN a while back and that is
| how I found it. The premise is fun, you're playing against
| the developers dad.
| 4ggr0 wrote:
| Thanks for the tip! Just played it and was absolutely
| destroyed by a random dad. I'm really not good at these
| word-based games, my strength is Globle and Travle. But
| Dadagrams is fun, added it to my bookmarks ;)
| timvdalen wrote:
| Are moo and new supposed to be homophones of m and n?
| shawabawa3 wrote:
| Apparently... I don't understand why it wouldn't be "mew" and
| "new"
|
| I have to say the connections this time was particularly
| poor. Even with the answers I don't get it
|
| What do Day-O and Jackie-O reference? Why are they linked to
| Daddy-O and Jell-o? Random works that end in -O sometimes in
| obscure situations?
| fallinghawks wrote:
| > Random works that end in -O
|
| Not random, but otherwise yes, end in O. But someone above
| said you have to be an American to get these and I
| generally agree.
|
| Daddy-o: a 50s hipster term
|
| Day-o: a song by Harry Belafonte
|
| Jackie O: Onassis, wife to President John F Kennedy
|
| Jell-o: a longstanding dessert mix
| dmonitor wrote:
| Day-o is a pretty deep cut for anyone. I realized they
| probably wanted Jell-O and other 'things that end in -o',
| but I couldn't think of the others.
| lapetitejort wrote:
| Beetlejuice fans will recognize it easily:
| https://www.youtube.com/watch?v=AQXVHITd1N4
| jameshart wrote:
| Also a slickly executed theme on today's Puzzmo crossword:
| https://www.puzzmo.com/today
|
| (Zach Gage's puzzmo is a great collection of daily puzzles if
| you're a Wordle/Connections player who craves more)
| AnimalMuppet wrote:
| For purists, there's Pi Second: 3/14 1:59:23.
|
| Not precise enough? You can go to Pi Millisecond, Pi Nanosecond,
| as far as you want to go. You don't get to enjoy them for long
| though...
| jtylr wrote:
| 1:59:27, no? Or even 1:59:26.5 if we want to get more precise!
| AnimalMuppet wrote:
| Argh. Yes.
| ykonstant wrote:
| The wikipedia page on approximations of p contains a lot of
| fascinating results and historical tidbits:
| https://en.wikipedia.org/wiki/Approximations_of_%CF%80
| hans_castorp wrote:
| Today is 14.03. where I live....
| jtylr wrote:
| Unfortunately there isn't a 31st April.
| remram wrote:
| Who uses a dot to separate day and month?
|
| 14/03/2024 and 2024-03-14 are already 1 format too many...
| jonathankoren wrote:
| People that use / to separate hours and minutes.
| hans_castorp wrote:
| I wrote that comment on 14.03.2024 at 14:55:00
| jonathankoren wrote:
| I think you mean 0/55/2
| Reubensson wrote:
| A lot of people use. I think it is common at least in Europe
| but probably varies by country.
| tomgp wrote:
| As a Brit I celebrate it on the 3rd day of the 14th month
| mavhc wrote:
| Not the 31st of April?
| tomgp wrote:
| I mean now you mention it that might make more sense, but
| we're a simple people bound by our traditions.
| alsetmusic wrote:
| This genuinely made me happy. May the Fourth be with you!
| Wait...
| NeoTar wrote:
| I celebrate Pi-approximation day on the 22nd of July
| colimbarna wrote:
| 3.14 is about 0.00159 less than pi, whereas 22/7 is about
| 0.00126 greater than pi, making pi approximation day closer
| to pi than pi day.
| noman-land wrote:
| This is the research I come here for.
| zeroonetwothree wrote:
| Every day is pi-approximation day. It's just a question of
| how good the approximation.
| lapetitejort wrote:
| The day 1131/12/30 yields 3.1416 repeating.
| 725686 wrote:
| That would be February 3rd, no?
| tempodox wrote:
| An apt comment on the horrid US-ian date format. Although the
| international notation, YYYY-03-14, which is de rigueur for
| political correctness, would side with the 14th of March.
| Sohcahtoa82 wrote:
| > YYYY-03-14, which is de rigueur for political correctness
|
| I like it just because I can use it in filenames and sort by
| name and I'm guaranteed to get it in chronological order.
| RetroTechie wrote:
| It's also the birthday of Albert Einstein (1879).
| rand0mx1 wrote:
| Also Karl Marx died on 14th of March.
| andygcook wrote:
| Plugging the Pi Day Challenge, an online puzzle math quest all
| about pi created by my high school math teacher, Mr. Plummer (aka
| Plum). He's been updating it with new puzzles for the past 15
| years with the only goal of getting students excited about math.
|
| It requires a login to save your progress which I know a lot of
| people dislike here... but it's worth checking out:
| https://www.pidaychallenge.com/
| taintedq wrote:
| Is it just me or is puzzle 24 still locked?
| SeanLuke wrote:
| Perhaps we might proclaim all of March to be Biblical Pi Month in
| solemn remembrance of the declaration made in 1 Kings 7:23 and 2
| Chronicles 4:2 that PI = 3.
|
| Also consider a semicircle of diameter D. Here the outside of the
| semicircle S, is D * PI / 2, so PI = 2 * S / D.
|
| Now instead of a single semicircle, consider two semicircles,
| each of diameter D/2, stacked on top of each other so their
| diameters line up to add to D. Each has a outside S/2, so once
| again PI = 2 * S / D.
|
| Now do it for 4 semicircles each of diameter D/4. Again, PI = 2 *
| S / D.
|
| Now continue to infinity. Eventually the outsides of the stacked
| semicircles will, at the limit merge to the diameter. Thus at the
| limit PI = 2 * S / D = 2 * D/D.
|
| Thus PI = 2. Maybe Pi Month should be February? I will leave that
| to the religious and mathematically inclined to argue.
| yreg wrote:
| Each pi day I get excited for a new Vihart video.
|
| https://www.youtube.com/watch?v=2a9YgCCQYVI
| jonnycat wrote:
| It's a special kind of person who cares enough about math to
| celebrate "pi day", but not enough to be disturbed by the
| approximation of 3.14.
| jedberg wrote:
| Even NASA only uses 15 digits because anything beyond that is
| unnecessary even at Universal scales.
|
| Also if you want to be really picky, you can celebrate at 1:59
| and 29 seconds.
| pinkorchid wrote:
| 27 seconds! :)
| madcaptenor wrote:
| I'd thought 26, but I wasn't rounding properly. I've heard
| it as "thirty-four seconds before two o'clock", to obscure
| what time it actually refers to.
| jonathankoren wrote:
| "Pi Day" is a fake holiday invented by Big Math to sell more
| math.
| jedberg wrote:
| It was invented by Dominoes to sell more pizza.
| eranation wrote:
| Pi Is (still) Wrong.
|
| https://www.youtube.com/watch?v=jG7vhMMXagQ
| skrbjc wrote:
| Congrats to all of those who received their MIT acceptances
| drewda wrote:
| Would have been more entertaining if the "Oppenheimer" movie had
| been made about Frank Oppenheimer [1] -- a younger brother of J.
| Robert and the founder of the Exploratorium museum in San
| Francisco [2], where Pi Day comes from [3]
|
| [1] https://en.wikipedia.org/wiki/Frank_Oppenheimer
|
| [2] https://en.wikipedia.org/wiki/Exploratorium
|
| [3] https://en.wikipedia.org/wiki/Pi_Day
| fnord77 wrote:
| my mom turns 90 today!
| tempodox wrote:
| It should rather be on the 116th day of the year, because 365/p
| [?] 116, so around 28th of March (27th in a leap year).
| jayrot wrote:
| As a reminder, Pi Day is a doomsday!
|
| https://en.wikipedia.org/wiki/Doomsday_rule
| BeFlatXIII wrote:
| Can't wait for e day on February 71st.
___________________________________________________________________
(page generated 2024-03-14 23:01 UTC)