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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…
Apr 26, 2020 · Mike Walters’s “Easy Doomsday” method: If YY is not already a multiple of 4, add 11, 22, or 33 according to whether YY modulo 4 is 1, 2, or 3. Now divide by 2, take the result modulo 7, and subtract from 7 to get the year code. For example, if YY=63 then we add 33 to get 96, divide by 2 to get 48, and take this modulo 7 to get 6.
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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The excellent video above describes John Conway's Doomsday Algorithm in great detail - far more detail than my simplified version. There is also an excellent video from Mind Your Decisions from which I have used the NYD formula. Here is an example calculation based on the steps I have provided:
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.
May 23, 2024 · A doomsday device is something which theoretically has the potential to destroy the world, or at least to put an end to human life as it is currently known. The concept of doomsday devices began to enter the popular imagination in the 20th century, when significant advances in the sciences led people to realize that such a device would be possible.
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Doomsday came on a Wednesday (= 3). Since 365 1 (mod 7), it follows that Doomsday moves forward one day per year, except that it mov. s forward by 2 days in a leap year. Thus in year 1900 + n, 0 n < 100, Do. msday occured on day 3 + n + [n=4]. Here [x] denotes the integer part of x, which is to say.
