{"id":16113386,"url":"https://github.com/richelbilderbeek/pi_approximation_day","last_synced_at":"2025-04-06T07:36:33.392Z","repository":{"id":49378670,"uuid":"124108196","full_name":"richelbilderbeek/pi_approximation_day","owner":"richelbilderbeek","description":"Pi Approximation Day","archived":false,"fork":false,"pushed_at":"2024-03-25T06:48:20.000Z","size":64611,"stargazers_count":2,"open_issues_count":0,"forks_count":0,"subscribers_count":3,"default_branch":"master","last_synced_at":"2025-02-12T12:57:24.448Z","etag":null,"topics":["approximation","pi","pi-approximation-day","pi-day","uppsala"],"latest_commit_sha":null,"homepage":"https://bit.ly/pad_uppsala","language":"Shell","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"gpl-3.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/richelbilderbeek.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2018-03-06T16:43:08.000Z","updated_at":"2023-10-14T10:49:44.000Z","dependencies_parsed_at":"2024-03-25T07:55:44.032Z","dependency_job_id":null,"html_url":"https://github.com/richelbilderbeek/pi_approximation_day","commit_stats":null,"previous_names":[],"tags_count":1,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/richelbilderbeek%2Fpi_approximation_day","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/richelbilderbeek%2Fpi_approximation_day/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/richelbilderbeek%2Fpi_approximation_day/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/richelbilderbeek%2Fpi_approximation_day/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/richelbilderbeek","download_url":"https://codeload.github.com/richelbilderbeek/pi_approximation_day/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":247451441,"owners_count":20940946,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["approximation","pi","pi-approximation-day","pi-day","uppsala"],"created_at":"2024-10-09T20:11:32.598Z","updated_at":"2025-04-06T07:36:33.361Z","avatar_url":"https://github.com/richelbilderbeek.png","language":"Shell","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Pi Approximation Day\n\nSince 2012, I celebrate Pi Approximation Day by approximating pi \nwith streetchalk.\n\n * What: Approximate pi with street chalk  (similar to [Pi Day](https://github.com/richelbilderbeek/pi_day))\n * When: Pi Approximation Day (that is, July 22nd) from 7:22 AM, then approximately one hour\n * Where: [Uppsala Slott, Uppsala](https://www.openstreetmap.org/search?query=uppsala%20slott#map=18/59.85363/17.63520),\n   which is a 10 minutes walk from the central station (see map below)\n * To bring: \n   * (optional) a box of street chalk\n   * (optional) knee protectors\n * Costs: nothing :-)\n\nIf rain is predicted, at 22:00 the day before, the event will be cancelled, \nwhich will be displayed in the status indicator here:\n\n```\n2024: Probably\n```\n\n![Uppsala](pics/map_uppsala_to_slott.png)\n\n\u003e How to get to the Slott\n\n![Gathering location](pics/map_uppsala_slott.png)\n\n\u003e The square at the Slott\n\n## 2023\n\nI celebrated alone this year, reaching 50 digits.\n\n## 2022\n\nI celebrated this time with BE and Ix. We did 200 digits.\n\n![](pics/2022/1_cropped.jpg)\n\n![](pics/2022/1.jpg)\n\n![](pics/2022/2.jpeg)\n\n![](pics/2022/3.jpeg)\n\n![](pics/2022/4.jpeg)\n\n![](pics/2022/5.jpeg)\n\n![](pics/2022/6_cropped.jpeg)\n\n![](pics/2022/6.jpeg)\n\n![](pics/2022/7.jpg)\n\n![](pics/2022/opt-opt-20220722_062625.jpg)\n\n![](pics/2022/opt-opt-20220722_064043.jpg)\n\n![](pics/2022/there.jpeg)\n\n\n## 2021\n\nI celebrated it alone this year, for the first time in Uppsala, \nfor 62 digits, which I did twice :+1:.\n\nTook me only half an hour and a third of a bucket of streetchalk, \nas the concrete is smooth.\n\n![](pics/2021_1.jpg)\n\n![](pics/2021_2.jpg)\n\n![](pics/2021_3.jpg)\n\n![](pics/2021_4.jpg)\n\n![](pics/2021_5.jpg)\n\n![](pics/2021_6.jpg)\n\n## 2020\n\nI celebrated it alone this year, for 40 digits :+1:.\n\n## 2019\n\nWe were with: \n\n * J.D.  \n * S.D.\n * V.D\n * W.D\n\nWe approximated 447 digits of pi.\n\n## 2018\n\nWe were with: \n\n * B. S-B.\n * J.D.  \n * M.B.\n * P. S-B.\n * R. B.\n * R. G.\n\nWe approximated 500 digits of pi, breaking all earlier records!\n\n### [Sikkom](https://www.sikkom.nl)\n\n * [Sikkom news item](https://web.archive.org/web/20210928014823/https://www.sikkom.nl/bier-jonkos-tag-foutje-pi-benaderingsdag-gevierd-in-noorderplantsoen/)\n\nPhoto's from the Sikkom news item:\n\n![Pi Approximation Day, photo by sikkom.nl](pics/2018_sikkom_1.jpg)\n\n![Pi Approximation Day, photo by sikkom.nl](pics/2018_sikkom_2.jpg)\n\n![Pi Approximation Day, photo by sikkom.nl](pics/2018_sikkom_3.jpg)\n\n## 2017\n\nSince 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen. \nIn 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.\n\nOur pi was filmed by the YouTube user `Bhut_Trolokia`, see his video [here](https://www.youtube.com/watch?v=zBL1f0vJxJs).\n\nOut pi got mentioned in a news article by [sikkom](https://web.archive.org/web/20210928012021/https://www.sikkom.nl/video-vreemde-227-boodschap-noorderplantsoen/).\nThe text in the article, however, is complete nonsense.\n\nHere are the photos, thanks to C.IJ.\n\n![](pics/2017_1.jpg)\n![](pics/2017_2.jpg)\n![](pics/2017_3.jpg)\n![](pics/2017_4.jpg)\n![](pics/2017_5.jpg)\n![](pics/2017_6.jpg)\n![](pics/2017_7.jpg)\n![](pics/2017_8.jpg)\n![](pics/2017_9.jpg)\n![](pics/2017_10.jpg)\n![](pics/2017_11.jpg)\n![](pics/2017_12.jpg)\n![](pics/2017_13.jpg)\n\n## 2016\n\nSince 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen. \nThis year I was helped by C.IJ. and we reached approximately 150 (nice) - 200 (sloppy) digits behind the comma.\n\n![](pics/2016_1.jpg)\n![](pics/2016_2.jpg)\n![](pics/2016_3.jpg)\n![](pics/2016_4.jpg)\n![](pics/2016_5.jpg)\n![](pics/2016_6.jpg)\n![](pics/2016_7.jpg)\n![](pics/2016_8.jpg)\n\n## 2015\n\nSince 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen. \nThis year I was helped by C.IJ. and we reached exactly 314 digits behind the comma.\n\n![](pics/2015_1.jpg)\n![](pics/2015_2.jpg)\n![](pics/2015_3.jpg)\n![](pics/2015_4.jpg)\n![](pics/2015_5.jpg)\n![](pics/2015_6.jpg)\n![](pics/2015_7.jpg)\n![](pics/2015_8.jpg)\n![](pics/2015_9.jpg)\n\n## 2014\n\nSince 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen. This year I reached\nexactly 100 digits behind the comma. \n\n![](pics/2014_1.jpg)\n![](pics/2014_2.jpg)\n![](pics/2014_3.jpg)\n![](pics/2014_4.jpg)\n![](pics/2014_5.png)\n\n## 2013\n\nSince 2012, I celebrate Pi Approximation Day by approximating pi with streetchalk at the Noorderplantsoen Groningen. \nIn 2013, a local newspaper found out:\n\n![Pi Approximation Day article Dagbad van het Noorden 2013-07-23](pics/RC_20130722.jpg)\n\nThanks to the people that found out this article was written!\n\n![](pics/2013_1.jpg)\n![](pics/2013_2.jpg)\n![](pics/2013_3.jpg)\n![](pics/2013_5.jpg)\n![](pics/2013_6.jpg)\n![](pics/2013_7.jpg)\n![](pics/2013_8.jpg)\n![](pics/2013_9.jpg)\n\n## 2012\n\n2012 was the first your I celebrated Pi Approximation Day \nby approximating pi with streetchalk at the Noorderplantsoen Groningen.\n\n![](pics/2012_1.jpg)\n![](pics/2012_2.jpg)\n![](pics/2012_3.jpg)\n![](pics/2012_4.jpg)\n![](pics/2012_5.jpg)\n![](pics/2012_6.jpg)\n![](pics/2012_7.jpg)\n![](pics/2012_8.jpg)\n![](pics/2012_9.jpg)\n\n## FAQ\n\n### Why that time?\n\nDue to this unorthodox hour, we can work relatively undisturbed. \nIt is the KNMI time of sunrise, which means that there will be light to see. \n\n### How long does it take?\n\nAt the first of any of these conditions:\n\n * We've gone round the pond once\n * Out of street chalk\n * Not enjoying it anymore\n\nWith 5 people, it takes one and a half hour to get round the pond.\n\n### How much street chalk do you need?\n\nTo go round the pond once, one needs approx five boxes of street chalk.\n\n### How to listen to the digits of pi?\n\nOn Linux, install pi:\n\n```\nsudo apt-get install pi\n```\n\nthen:\n\n```\npi 2000 | espeak -s 10 -g 10\n```\n\nOr read out the text file:\n\n```\ncat pi.txt | espeak -s 10 -g 10\n```\n\n## QR code for this website\n\n![](pics/bit.ly_pad_uppsala.png)\n\n## Links\n\n * [2023 Facebook event](https://fb.me/e/2Hd3REfys)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frichelbilderbeek%2Fpi_approximation_day","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Frichelbilderbeek%2Fpi_approximation_day","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frichelbilderbeek%2Fpi_approximation_day/lists"}