Pi Day is 4 weeks to go!🎉

Pi in the real world: Did you know your GPS depends on Pi! GPS satellites use Pi to calculate the curvature of the earth? It's fascinating how Pi can be a part of our everyday life! 🤯

#Mathstodon #GPS #PiDay

#PiDay Countdown: 5 weeks to go!📐

Pi Day facts:
1️⃣ Pi Day was officially recognized as a Holiday in 2009!🎉
2️⃣ Lu Chao broke the world record for reciting the most digits of pi to the 67,890 decimal places in 24hrs and 4 minutes! 🤯

if you haven't already check out our pi day activity: https://explore.stemcoding.org/projects/piday2.html

#CodingArt #MathIsArt #GenerativeArt

#PiDay should be the 31st of April (31/4).

Happy #ShamelessPlug Day!

Finding myself in need of #PiDay apparel ("ap-π-rel"?) for an event or two, I've added a couple of pi-related t-shirt designs to my Etsy shop: http://inspiredbymath.etsy.com

• "Approximately Pi" demonstrates the near-equality of π and √2+√3 (that is, 3.1415… vs 1.4142…+1.7320…=3.1462…). Note that √2 and √3 appear courtesy of our old friends the 45°-45°-90° and 30°-60°-90° triangles.

• "Powers-of-Pi Pinwheel" features a sequence of iterated involutes of a unit semicircle, each with length π^n/n! . It's the special case (t=π) of Y. S. Chaikovsky's delightful visualization of the power series for sin(t) and cos(t). (Fun Fact: Long ago, I adapted Chaikovsky's construction to tan(t) and sec(t), but cot(t) and csc(t) still remain elusive. https://trigonography.com/?p=881 )

These join two pi-and-tau designs.

📆 Pi Day Countdown: 7 weeks to go !!📆
Celebrate with a slice of pie and a fun activity! 😋 🎉
Check out our pi day activity here: https://explore.stemcoding.org/projects/piday1.html

Fun fact: Archimedes of Syracuse was credited with the first theoretical calculation of π around 250 BCE. He use polygons to "trap" the circle to find the value! 📐

Fun fact 2: Albert Einstein's Birthday is also on Pi Day in 1879!

#PiDay #MTBoS #ITeachMath #PhysicsEd #Einstein #STEMcoding

Pi day is coming up! Check out our pi day activity!
https://explore.stemcoding.org/projects/piday1.html
#piday2026 #piday

No matter what time zone you're in, on 12 January at 11:12:13 a.m., the year 2026 will already be over to Pi % (3.141590563%). More precisely, this applies to the second between 11:12:12 a.m. and 11:12:13 a.m.
Happy (sort of) #PiDay #random #mathematics

π Happy ordinal pi day! (314th day of the year)

No, it should not be the US-centric March 14th, which most of the world writes as 14/3 or 14-3.

Science and mathematics are international, without borders, not specific to any one country or culture. As scientists and mathematicians we should seek international-based celebrations that bring us all together around the globe rather than country-specific dates.

The ordinal date (ISO 8601) is the only way to have an international nth day of the year: https://en.wikipedia.org/wiki/Ordinal_date

Similarly:

* 88th day: worldwide Piano Day: https://en.wikipedia.org/wiki/Piano_Day (blogged https://tantek.com/2024/088/t1/world-piano-day-ordinal-date-iso-8601)
* 256the day: 8-bit day or https://en.wikipedia.org/wiki/Programmer%27s_Day (blogged https://tantek.com/2025/257/t1/happy-8bitday-255-bytes-max)

I suspect there are other such annual worldwide holidays that are pinned to the ordinal date rather than a Gregorian or other non-decimal calendar. Let me know if you have a favorite that you celebrate!

🥧 I haven't made a pie (or picked one up) yet — will have go pick up a slice during a break in this evening’s #w3cTPAC meetings (which are in Japan where it’s already the day after pi day).

Previously:
* https://tantek.com/2022/314/t1/happy-ordinal-pi-day

#piDay #actualPiDay #ordinalDate #ISO8601 #ISOdate

Giorno del Pi greco (Pi day) https://www.staipa.it/blog/giorno-del-pi-greco-pi-day/?feed_id=1370&_unique_id=65f2ca1487c26

Il 14 marzo è il Giorno del Pi greco (Pi day, in inglese), la scelta è ispirata dalla data, vista nel formato mese-giorno usato negli Stati Uniti: 3-14, alcuni celebrano la ricorrenza dalle ore 15, in modo da adeguarsi all'approssimazione 3,1415, questo articolo è stato pubblicato il 14 marzo alle 15:09 per adeguarlo ...

#GiornodelPigreco #Matematica #Piday #Pigreco #Scienza

AI Model Trapped in Raspberry Pi #piday #raspberrypi « Adafruit Industries – Makers, hackers, artists, designers and engineers! https://blog.adafruit.com/2025/09/26/ai-model-trapped-in-raspberry-pi-piday-raspberrypi/

- Jongler ? :drake_dislike:
- Jongler à une main ? :drake_dislike:
- Jongler avec des cubes à une main ? :drake_dislike:
- Jongler avec des cubes à une main et les résoudre de l'autre ? :drake_dislike:
- Jongler avec des cubes 2x2, 3x3 et 4x4 à une main et les résoudre de l'autre ? :drake_dislike:

- Jongler avec des cubes 2x2, 3x3 et 4x4 à une main et les résoudre de l'autre en récitant 530 décimales de Pi ? :drake_like:

Prouesse réalisée par Ethan Jan.

#RubiksCube #PiDay

On this 22nd day of the 7th month, 22/7 being a better approximation of π than 3.14, here is a curio due to P. Olivera (2005).
Take the fractional part of π, and sum the first 3 groups of 6 decimal digits: you get 1588419.
Skip the next 15 digits: 88419 follow.

Here is a #CommonLisp program to illustrate:
<https://vnikolov-lines.blogspot.com/2025/07/en-curio-about-digits-of-pi.html>.

Sources:
<https://mathworld.wolfram.com/PiDigits.html> (sets cookies)
via
<https://www.futilitycloset.com/2025/07/15/portent/>.

#Pi
#PiDay
#PiDigits

Its what I like to call True Pi Day mathematically 22/7 = 3.14 ^_^

#PiDay

22/7 = 3.142857142857142857 …
π = 3.141592653589793 …
Error of 0.04% (1 part in 2484)
#piday

22/7 – It’s π day!
Better π day.
Rational π day.
Bye bye Miss American π day.
#piday

https://www.piday.org/find-birthday-in-pi/

#PiDay #MyPiDay

Finally, a #ShamelessPlug reminder:

My pi-and-tau t-shirts (and others) are available in the InspiredByMath Etsy shop.

https://inspiredbymath.etsy.com

Order today and I can pretty-much *guarantee* delivery in time for both #PiDay and #TauDay ... 2026.

(Also: Etsy is currently running a seller promotion reimbursing a bit on sales made through the link; this doesn't help *you*, but *I* could certainly use the extra buck! :)

Thanks for your support!

While I'm at it ... Since division is better as an operation than a motivation, here's a quick musical PSA advocating against pi-vs-tau tribalism. (Apologies to Billy Preston.) #PiDay #TauDay

In March of 2023, my kiddo had recently been diagnosed with #CrohnsDisease, so when the Crohn’s & Colitis Foundation did a Pie Day fundraiser, I agreed to let my family hit me with one pie for every $50 I raised.

When I made that deal, I had no idea that I would raise over $750! But a promise is a promise.

That was over two years ago, but I am not a video producer, and it took a long time for my #ADHD brain to find itself in the right space to edit this all together. Better late than never though, right? And I’m really happy with how it turned out.
#PiDay #PieDay

https://youtu.be/ps_-CSyBN2g

If you can draw a circle in pixel art, you can prove π = 4. Happy Pi Day!

#PiDay #AprilFoolsDay #AprilFools #AprilFoolsDay2025 #PixelArt