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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.
Doomsday Algorithm. Determine the "anchor day" for the century. 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:
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How to Mentally Calculate the Day of the Week for Any Date. The so-called doomsday algorithm uses clever mental arithmetic and mnemonic tricks to enable a quick determination.
- What's A Doomsday, though?
- The Algorithm
- Takeaway Thoughts
The "Doomsday" of the "Doomsday rule" is not about the end of the world. Every year has so called Doomsdays. A Doomsday is a day whose weekday is known. For every year the Doomsdays have the same weekday. For example: If you know that the November 7th (a Doomsday) was a Saturday - which weekday is November 21st? You know that there's 14 days in bet...
The Doomsday rule takes advantage of the fact that patterns in calendars repeat every so often. Here's a basic diagram of what the algorithm is actually doing: It basically narrows down the weekday by first looking at the century given, then the year, then the month and finally pinponting the exact date. Let's go through it step-by-step. We'll try ...
When I first heard about the Doomsday rule, I was baffled. It took me quite some time (and calculating) to understand it, but once I got it, I was amazed by its cleverness. The algorithm isn't too costly either, because it only uses algebra. With some more memory hooks (especially memorizing Doomsdays and anchor days for several years) one can calc...
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.
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.
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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.
