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1. cklixx.people.wm.edu › teaching › math400The Doomsday Algorithm and its Applications - William & Mary

   cklixx.people.wm.edu › teaching › math400

   Luckily, there exists a method, devised by John Conway, to calculate the day of the week of any given day, known as The Doomsday Algorithm. With a little memorization and some practice, you can calculate an answer without needing a phone or an online calendar.

2. web.williams.edu › Mathematics › sjmillerDoomsday Algorithm - Williams College

   web.williams.edu › Mathematics › sjmiller

   When advancing a century from a century you know the Doomsday for, go back two days, unless the new century is divisible by 400, in which case only go back one day. Use the anchor day for the century to calculate the doomsday for the year. Century Day: Tuesday = 1600, 2000,...

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3. www.math.union.edu › student_theses › wintersAnalysis of the Doomsday Algorithm By Edward Winters

   www.math.union.edu › student_theses › winters

   The Doomsday Algorithm is an algorithm in which you can put in any date and nd out what day of the week it fell on. This algorithm was rst invented by Carroll but then Conway simpli ed it when he came up with the Doomsday rule. The Doomsday rule establishes a date that you can base all other dates o of to nd what day it landed on much quicker.

4. cklixx.people.wm.edu › teaching › math400The Doomsday Algorithm and its Applications - William & Mary

   cklixx.people.wm.edu › teaching › math400

   How it works. 3 main steps. Century anchor day. Doomsday for that year. Nearest day. Notation. Easier to work with DoWs as numbers. Sunday (0) Monday (1) ... Saturday (6) Century Anchor Day. Remember the 400-year cycle? Two ways to calculate anchor: [1] (5 * (c mod 4)) mod 7 + 2. c = ⌊year/100⌋. • Gives us our starting count.

5. www.instructables.com › John-Conway-Doomsday-DeviceJohn Conway Doomsday Device : 8 Steps (with Pictures ...

   www.instructables.com › John-Conway-Doomsday-Device

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   John Conway Doomsday Device: John Conway is a legendary mathematician who among his many achievements, devised a simple algorithm for figuring out in your head on what day of the week any calendar date would fall. He called it the Doomsday Rule. He was known to be able to perfo…

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6. en.wikipedia.org › wiki › Doomsday_ruleDoomsday rule - Wikipedia

   en.wikipedia.org › wiki › Doomsday_rule

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   The Doomsday rule, Doomsday algorithm or Doomsday method is an algorithm of determination of the day of the week for a given date. It provides a perpetual calendar because the Gregorian calendar moves in cycles of 400 years.

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   How to use doomsday device to calculate day of the week?

   • In order to show you how to use your Doomsday Device to calculate the day of the week of any given date, let us first try a simple worked example: Rotate the slotted discs to expose three numbers that add up to the year, 2134. That is, 2100 + 24 + 10. Other numbers might appear in two of the slots. They can be ignored.

   John Conway Doomsday Device : 8 Steps (with Pictures) - Instructables

   www.instructables.com/John-Conway-Doomsday-Device/

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   What is Doomsday rule?

   • The Doomsday rule, Doomsday algorithm or Doomsday method is an algorithm of determination of the day of the week for a given date. It provides a perpetual calendar because the Gregorian calendar moves in cycles of 400 years.

   Doomsday rule - Wikipedia

   en.wikipedia.org/wiki/Doomsday_rule

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   What is the Doomsday algorithm?

   • Conway sought out to create an algorithm that was relatively easy and simple enough for people to learn and use on their own. His method was popularized nearly a century later in 1973. The Doomsday Algorithm takes advantage of the fact that our current calendar system, the Gregorian Calendar, repeats every 400 years.

   The Doomsday Algorithm and its Applications - William & Mary

   cklixx.people.wm.edu/teaching/math400/Cuy-P1.pdf

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   How do you calculate a doomsday?

   • Determine the "anchor day" for the century. Use the anchor day for the century to calculate the doomsday for the year. Tuesday = 1600, 2000,... Sunday = 1700, 2100, ... Friday = 1800, 2200, ... *Wednesday = 1900, 2300, ...

   How to find the day of the week an event occurred - Williams College

   web.williams.edu/Mathematics/sjmiller/public_html/hudson/Ekness____Doomsday Presentation.pdf

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   What are 'Doomsdays'?

   • Conway noticed that each year, there were certain dates that always fell on the same day of the week, which he called “Doomsdays” (DDs. For example, in 2021, October 10th, November 7th, and December 12th, all fell on a Sunday (full list on Table 1).

   The Doomsday Algorithm and its Applications - William & Mary

   cklixx.people.wm.edu/teaching/math400/Cuy-P1.pdf

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   What is an example of a 400-year cycle of doomsdays?

   • For example, the anchor day of 1700–1799 is the same as the anchor day of 2100–2199, i.e. Sunday. The full 400-year cycle of doomsdays is given in the adjacent table. The centuries are for the Gregorian and proleptic Gregorian calendar, unless marked with a J for Julian. The Gregorian leap years are highlighted.

   Doomsday rule - Wikipedia

   en.wikipedia.org/wiki/Doomsday_rule

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8. www.rudy.ca › doomsdayDoomsday Algorithm - Rudy

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   Feb 22, 1994 · The Doomsday Algorithm gives the day of the week for any date (and you can do it in your head) Created 1994-02-22, Updated 2024-01-04 with examples for 2024. Overview. The Doomsday Algorithm is presented in the following sections. February 28th or 29th: Doomsday is the last day of February.