# Happy Pi Day 🎉π🎉

March 14 is Pi Day, an annual celebration of the mathematical constant pi (π), the ratio of the circumference of a circle to its diameter.
The symbol was first used in mathematical calculations by Welsh mathematician William Jones and later it was popularized by Swiss mathematician Leonhard Euler, who adopted it in 1737.
However, the numerical relationship between a circle’s diameter and circumference has been considered since antiquity.
The Babylonians (c. 2000 BC) used 3.125 to approximate pi, while the Egyptians 3.160. In the Bible the bowl in King Solomon’s Temple used for ablution of the priests had a diameter of 10 cubits and a circumference of 30 cubits which places the ratio at 3.

Its value is often rendered as 3.14 but that is an approximation. The real value of pi is 3.1415926535 followed by a string of digits that goes indefinitely, because it is an irrational number. In its endless stream of digits, pi is believed to contain the numbers 0 through 9 in every imaginable combination, also our phone number, social security number, ATM…

Pi Day is held on March 14 because in the American date format it is 3/14. In addition, it is Albert Einstein’s birthday… and physicist Stephen Hawking — considered by some to be Einstein’s intellectual successor — died on March 14, 2018.

Pi Day started in 1988 at the San Francisco Exploratorium, where the first official celebration was organized by physicist Larry Shaw.

Pi Day may be observed by eating pie, to celebrate the pun as the two words are homophones (they sound the same) and many pies have a circular shape.

Image: Wikimedia Commons, – Matman from Lublin -Apple pie Pi Day

## 86 thoughts on “Happy Pi Day 🎉π🎉”

1. Giusy

Buongiorno Luisa 😀 che notizia interessante.. ripenso in questo modo a tutti i debiti in matematica presi ahahahaah (sempre recuperati però eh!) 😀 molto interessante il post. Buona giornata😚😚😚

Liked by 2 people

1. Grazie Giusy carissima… a me è sempre piaciuto giocare con i numeri
Buona domenica 🌼🌼🌼
Potresti mangiare una bella fetta di pie per celebrare 🍰

Liked by 3 people

1. Giusy

Uuuu.. quanto apprezzo chi si diverte con i numeri 🤭 proprio perché sono incapace 😂. accetto! 🍰 per tutti!🌻

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2. Paola Pioletti and little me

Ma che bello happy pie then!

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1. Buona domenica, Paola cara!😘🍰😘

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1. Paola Pioletti and little me

A te Lu

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3. Hello Luisa Ji
Whoops why because again blog post same things😅 here, after time okay but nice post with information about that ( Pi day )👍celebration.
Thanks for this. 😊
Happy Women’s Days!🌿🎵

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1. Thank you, Amit, for your kind words and good wishes! 🙏💜🎉💜🙏

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4. Haha, I had no idea there was such a thing!! Thank you for this!

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1. I am happy to stimulate your curiosity! Thank you for your lovely words 😉👌

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5. Molto bella con tanto di retrospettiva storica. Complimenti!

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1. Grazie!!! Piace anche a me scoprire e condividere qualche notizia interessante🙏🙏🙏

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1. La ricerca, la scoperta e il racconto sono grandi cose 😉

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6. A fun and informative post. On a parallel note, since pi is an irrational number and goes on forever, I wonder if that is why some of our politicians want to have a slice of the pi because they are irrational and can yack or remain in office for what seems like forever.

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1. Many thanks, Pat 🙏😘🙏
I appreciate your cool reflection on this.
The same question is valid here in Italy, too😃😃

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1. Thanks, Luisa. I figured the politicians I described were more than just the US. 🙂

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2. 😉😃🤗
Have a nice Sunday 🌼🌼🌼

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7. Thank you for sharing your thoughts in this post

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1. Thank you very much 🙏🙏🙏
I am so happy and pleased that you enjoyed it.

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8. Interessante 🍰Serena domenica Luisa carissima 🌷🌷🌷😘

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1. Buona domenica a te! In Brianza abbiamo una giornata soleggiata ma ventosissima! 😘

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1. Anche a Siena sole e raffiche di vento

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9. A pi pie. How creative.
Enjoy a beautiful Sunday

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1. Thank you🙏🙏🙏
I wish you the same 🌼🌹🌼

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10. conosco la storia ma, questo racconto è diverso e molto bello. Buona domenica! 🙂

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1. Grazie 🙏🙏🙏 … e buona domenica 🌼🌹🌼

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11. Lokesh Sastya

Informative and interesting presentation. Thank you for sharing.😀😀

Liked by 2 people

1. I’m really glad you liked it!
Thanks a lot🙏🙏🙏

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1. Lokesh Sastya

I have shared it to my 4 friends who are pursuing B.tech in renowned govt institutions. They love maths.

Liked by 3 people

12. Una mia collega che insegnava matematica usava festeggiare il Pi greco day e faceva dolcetti a forma di Pi greco, integrale e radice quadrata…

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1. Che bella abitudine!!!! 🌹😘🌹😘🌹

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13. En France, nous avons un moyen mnémotechnique pour retenir les décimales de PI.
“Que j’aime à faire apprendre un nombre utile aux sages…”
En prenant le nombre de lettres de chaque mot, on trouve 3 1 4 1 5 9 2 6 5 3 5 …
Avez-vous une telle phrase en Italie ?
Buon pomeriggio, Luisa.

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1. Quelle belle méthode! il y a probablement une phrase en italien aussi, mais je dois avouer que je ne la connais pas.
Bonne soirée 🙏😘🙏

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14. Fantastica la torta pi-greco, 👍. Non conoscevo questa celebrazione. In matematica era un’autentica schiappa: è una materia che non mi è mai piaciuta. Per fortuna che compensavo i brutti voti che prendevo in questa materia con voti abbastanza alti in materie come italiano, inglese, ecc

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1. Sai che a me la matematica piaceva? Mi poneva delle sfide a cui mi piaceva dedicarmi 😘😘😘

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1. Avevi voti alti? Sai, come si dice sempre: quando una materia piace si studia anche più volentieri e quindi si va bene sia nelle verifiche scritte che nelle interrogazioni. Il momento di fare i compiti in matematica era sempre problematico perché era come se il mio cervello decidesse di andare a “fare due passi”, 😁.

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15. Another fascinating bit of information as always. I never realised that Pi was celebrated in this way. Today in the UK, as well as Pi day it is also Mother’s Day.

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1. Is it? We celebrate it in May 🌹🌹🌹🌹🌹

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16. Lo ignoravo..come del resto ignoro moltissime altre informazioni.
Grazie Luisa.

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1. Grazie per lo splendido omaggio floreale… e buona settimana 💖💖💖

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17. Very informative. I never thought…3/14… Mathematically..and more so as pi…. enjoy your pie as you celebrate the Pi Day.

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1. Thank you for your kind appreciation
😊 My pie was delicious 🍰

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18. […] Happy Pi Day 🎉π🎉 — words and music and stories […]

Liked by 1 person

1. Thank you for reblogging! 🙏🌺🙏
PS: I’m not from the US, but from Italy 😉

Liked by 1 person

19. fulvialuna1

Questa mi mancava! C’è sempre da ….conoscere 😉

Liked by 2 people

1. … e a me piace andare a caccia di curiosità
Buona settimana 🌼🌼🌼🌼🌼

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1. Thank you 🙏🙏🙏
,,,. and the same to you!

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20. Pie and coffee in a circle a perfect circumferance.

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21. Non sanno più che inventatsi. Ormai ogni giorno e una ricorrenza

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22. That’s really cool information 😎🙂💐

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1. Thank you very much for this kind feedback!🙏

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24. That circumference is mirrored on myself by eating such pi 🙂

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25. Raj SJ

π day celebration💐🎉🥂

Liked by 1 person

1. Raj SJ

😊

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