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- The most mind-boggling controversy in the contemporary philosophy of science is the “doomsday argument,” a claim that a mathematical formula can predict how long the human race will survive.
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Apr 26, 2020 · Doomsday method: Year code = 0, Century adjustment = 2, so Doomsday was a Tuesday in 1900. Closest Doomsday = Jan. 4 (since 2000 is a leap year), so January 30 (26 = 28 – 2 days later) was a Sunday.
- 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 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.
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.
Jun 28, 2019 · The most mind-boggling controversy in the contemporary philosophy of science is the “doomsday argument,” a claim that a mathematical formula can predict how long the human race will survive. It...
The Doomsday algorithm is a method devised largely by John Conway for mental calculation of the day of the week. There is a key step in this that is the most work, and there are many different ways that step can by done. I'm curious what methods mathematically oriented people use.
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