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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.
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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.
Apr 26, 2020 · Conway’s Doomsday algorithm. In Conway’s method, instead of memorizing a code for each month we memorize certain dates, called Doomsdays, which always fall on the same day of the week in any given year.
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.
The Doomsday rule is a method devised by John Conway for computing the day of the week of any given date. The method is based on first computing Doomsday, which is the day of the week of the last day of February. First of all, we need a method of numbering the days of the week. We regard Sunday as Day 0, Monday as Day 1, Twosday as Day 2, etc.
The so-called doomsday algorithm uses clever mental arithmetic and mnemonic tricks to enable a quick determination. Trick question: What day did September 6, 1752, fall on?
A doomsday device is a hypothetical construction — usually a weapon or weapons system — which could destroy all life on a planet, particularly Earth, or destroy the planet itself, bringing "doomsday", a term used for the end of planet Earth.
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.
