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Pi Approximation Day

Since 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk.

  • What: Approximate pi with street chalk
  • When: at sunrise, which is at 4:08 AM at Pi Approximation Day (that is, Juli 22nd)
  • Where: Olof Palmes Plats, Uppsala, which is at the central station (see map below)
  • To bring: a box of street chalk, knee protectors are recommended
  • Costs: a box of street chalk :-)

If rain is predicted, at 22:00 the day before, the event will be cancelled, which will be displayed in the status indicator here:

2022: probably yes

Gathering location

2021

I celebrated it alone this year, for the first time in Uppsala, for 62 digits, which I did twice 👍.

Took me only half an hour and a third of a bucket of streetchalk, as the concrete is smooth.

2020

I celebrated it alone this year, for 40 digits 👍.

2019

We were with:

  • J.D.
  • S.D.
  • V.D
  • W.D

We approximated 447 digits of pi.

2018

We were with:

  • B. S-B.
  • J.D.
  • M.B.
  • P. S-B.
  • R. B.
  • R. G.

We approximated 500 digits of pi, breaking all earlier records!

Sikkom

Photo's from the Sikkom news item:

Pi Approximation Day, photo by sikkom.nl

Pi Approximation Day, photo by sikkom.nl

Pi Approximation Day, photo by sikkom.nl

2017

Since 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen. In 2017 we were with six: B. S-B., C.IJ., J.K, M. S-B., P. S-B and me. We reached 247 digits behind the comma.

Our pi was filmed by the YouTube user Bhut_Trolokia, view the YouTube video here.

Out pi got mentioned in a news article by sikkom. The text in the article, however, is complete nonsense.

Here are the photos, thanks to C.IJ.

2016

Since 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen. This year I was helped by C.IJ. and we reached approximately 150 (nice) - 200 (sloppy) digits behind the comma.

2015

Since 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen. This year I was helped by C.IJ. and we reached exactly 314 digits behind the comma.

2014

Since 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen. This year I reached exactly 100 digits behind the comma.

2013

Since 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen. In 2013, a local newspaper found out:

Pi Approximation Day article Dagbad van het Noorden 2013-07-23

Thanks to the people that found out this article was written!

2012

2012 was the first your I celebrated Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen.

FAQ

Why that time?

Due to this unorthodox hour, we can work relatively undisturbed. It is the KNMI time of sunrise, which means that there will be light to see.

How long does it take?

At the first of any of these conditions:

  • We've gone round the pond once
  • Out of street chalk
  • Not enjoying it anymore

With 5 people, it takes one and a half hour to get round the pond.

How much street chalk do you need?

To go round the pond once, one needs approx five boxes of street chalk.

How to listen to the digits of pi?

On Linux, install pi:

sudo apt-get install pi

then:

pi 2000 | espeak -s 10 -g 10

Or read out the text file:

cat pi.txt | espeak -s 10 -g 10