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# Topic: Doomsday algorithm

 Doomsday rule - Wikipedia, the free encyclopedia The algorithm for mental calculation was invented by John Conway. Doomsday is directly related to weekdays of dates in the period from March through February of the next year. Doomsday is related to the dominical letter of the year as follows. en.wikipedia.org /wiki/Doomsday_algorithm   (1468 words)

 Archimedes Submerged But Doomsday is the same weekday all year, while you have to remember that in January and February Keyday is the same weekday as last year’s Doomsday. Doomsday also falls at a fixed offset from certain holidays: July 4 is a Doomsday, Christmas is the day before Doomsday, New Year’s day is the day before Keyday, and Veteran’s day 11/11 is always 4 days after Doomsday 11/7 (duh). Writing D(’00) for the century year Doomsday and using addition of numbers to weekdays, the general rule is: for Y in 0.. archimerged.wordpress.com   (5661 words)

 Doomsday algorithm The Doomsday algorithm for calculating the day of the week makes use of the fact that in each year, April 4th (4/4), June 6th (6/6) August 8th (8/8), October 10th (10/10) and December 12th (12/12) are all the same day of the week. The name makes the algorithm sound more dire than it is. It's really just a trick to make it easy to calculate the day of the week for any day by knowing the day of the week for one day in each month. The algorithm was invented by John Conway, also known for the Game of Life. www.bobcongdon.net /blog/2004/06/doomsday-algorithm.html   (108 words)

 Doomsday Algorithm — rudy.ca The Doomsday algorithm is on pages 795-797, and the rest of the book is mainly about games, with substantial emphasis on their mathematical underpinnings. In the original version of the Doomsday algorithm, the odd months were a bit harder to remember than "I work from 9-5 at the 7-11." You had to remember if the odd month was a long month or a short month. The Doomsday Algorithm was "latest link in the braid" for the week of April 6-12, 1999. rudy.ca /doomsday.html   (3779 words)

 Doomsday is approaching - Official Anna Kournikova Message Boards Doomsday is February 28/29, or, in other words, Doomsday is always the last day of February. Doomsday 2000 was Tuesday, and 2000 is a leap year (or, more correctly, it was), so we have to use January "32nd" as our Tuesday. In order to do the Doomsday algorithm for any year in the 1900's (when most of us were born -- you usually want to be able to do birthdays for people), you have to memorize the fact that Doomsday for 1900 is a Wednesday. www.kournikova.com /community/showthread.php?t=3974   (3325 words)

 [No title] [Conway's mnemonic for remembering that Wednesday is the starting doomsday ("century number") for the 1900s is that "we" were all born in the 1900s.] For years 2000-2099, it's Tuesday (maybe remember this from the 2 in 2000). The three numbers to add to the original doomsday are the number of dozens, the remainder, and the remainder divided by 4 (as usual, ignoring any fractional part when dividing by 4). Get good enough with both of these algorithms to try them with confidence on your friends and family (e.g., figure out the day of the week they were born on). personalwebs.oakland.edu /~grossman/MTE210/ass1.fa04.html   (2897 words)

 Science and Technology - Computer Science (Algorithms) The Doomsday algorithm is used to determine the day of the week (Sunday, Monday, etc.) given any date. Each algorithm is described in easy-to-understand terms, without heavy use of calculus and probability theory. Algorithms have been developed for problems in geometry, graph theory, arithmetic, sorting and image processing. www.centerofweb.com /scitech/compsci_algorithms.htm   (1718 words)

 The Doomsday Algorithm The Doomsday Algorithm was first invented by Dr John Conway, also famous for creating the game of life. This is The Doomsday Algorithm by Simon Willison, posted on 2nd August 2003. Yup, the Doomsday algorithm is pretty easy to memorize once you use it a few times. simon.incutio.com /archive/2003/08/02/doomsday   (204 words)

 Doomsday (weekday) Information For any year, Doomsday is the day of the week on which the last day of February falls. Only for the calendar of January and February a further distinction between common year and leap year is needed. Alternatively the fixed connection with the Doomsday of the previous year is used for these two months. www.bookrags.com /Doomsday_algorithm   (1460 words)

 the calculator.org blog - Tuesday, 28 February 2006   (Site not responding. Last check: 2007-10-09) The "Doomsday" is actually the day of the week of the last day of February which is of course February 28th or February 29th in a leap year. For February, simply work back from the Doomsday by subtraction, so for example if Doomsday is a Wednesday and it is a non-leap year, then February 27th is Tuesday, February 21st is a Wednesday, as is the 14th and the 7th, and so on. On the 7th month Doomsday is on the 11th and on the 11th month Doomsday is on the 7th (remember 7-Eleven). www.calculator.org /weblog/default,date,2006-02-28.aspx   (1396 words)

 What is the day of the week? In 1997, which is not a leap year, therefore, the following dates fall on Doomsday (Friday): 1/3, 2/0 (1/31), 3/0 (2/28), 4/4, 5/9, 6/6, 7/11, 8/8, 9/5, 10/10, 11/7 and 12/12. The next and hardest part of the trick (because it requires a small amount of calculation) is to determine Doomsday for the year in question. The only difference is that the different leap year rule of the Julian calendar means that the rule given in Part 3 has to be modified. quasar.as.utexas.edu /BillInfo/doomsday.html   (1295 words)

 Course Technology--InfoWeb: Algorithms To learn more about algorithms, start at the PC Webopaedia site (www.pcwebopaedia.com) and search for "algorithm." You'll find a clear definition of the term and links to sites with more in-depth information. You might want to visit the Stony Brook Algorithm Repository at www.cs.sunysb.edu/~algorith/index.html where you will find a collection of algorithms for more than 70 fundamental problems. The Complete Collection of Algorithm Animations Viewing animations of algorithms can be an effective way to learn and understand algorithms. www.cciw.com /content/algorithms.html   (276 words)

 The Doomsday Rule for Fortnights The Doomsday rule was invented by John Horton Conway in the 1970's and is given in a book by him and Richard K. Guy entitled "Winning Ways for your Mathematical Plays, Volume II, Games in Particular", p. This rule is well described in several pages on the World Wide Web, including the Doomsday Algorithm for Day of Week of Rudy Limeback. Doomsday is February 28, since it is February in a common year. jimvb.home.mindspring.com /doom14.html   (1168 words)

 Doomsday Introduction   (Site not responding. Last check: 2007-10-09) John Conway's Doomsday Rule is a perpetual calendar algorithm; i.e., it is a way to calculate the day of the week of any given date. Here are some notes that I wrote up on the Doomsday Rule for a recreational mathematics course at Michigan Tech. Here is a Mathematica file that implements the Doomsday Rule as well as Conway's rules for computing Easter and Rosh Hashana. www.cst.cmich.edu /users/graha1sw/pub/doomsday/doomsdayintro.html   (208 words)

 [No title] Algorithms are as much a subject of computer science as they are a subject of mathematics. Doomsday Algorithm, and it works quite fast with practice. The Stony Brook Algorithm Repository is also worth checking out on this topic. www.mhhe.com /math/advmath/rosen/student/help/rosen.chapter2.html   (528 words)

 Algorithms Specific algorithms John Horton Conway designed an algorithm he calls "Doomsday", which predicts the day of the week for any date. Find out how algorithms are being applied to the fields of evolution and genetic research at http://cs.felk.cvut.cz/~xobitko/ga/. A good resource for exploring specific algorithm questions is the Dictionary of Algorithms and Data Structures. www.infoweblinks.com /content/algorithms.htm   (364 words)

 News Forum | The University of Montana   (Site not responding. Last check: 2007-10-09) A more down-to-earth Conway invention is the "Doomsday Algorithm," a rule for determining the day of week of any given date. Created in response to a challenge by Gardner, the rule is simple enough for Conway to apply in his head, usually in under two seconds. People proficient with the algorithm find it easy to detect calendrical errors in books and movies -- or just to amaze their friends. www.umt.edu /urelations/nf/archive/82800/math.htm   (427 words)

 [Tutor] RE: james2dope's little prgm for holiday calendar   (Site not responding. Last check: 2007-10-09) It's called the Doomsday Algorithm, and it was originally created by Dr. You will have to pay particular attention to Easter Sunday thou, as this date is very rarely the same on any two consecutive years. Also, a search for "Doomsday Algorithm", "calendars, Python" and combinations of such on google will prob'ly yield many free sources of completed scripts and info to get you going. mail.python.org /pipermail/tutor/2003-July/024338.html   (251 words)

 CS110 Spring 2002: Project#4 Algorithms for some of the above computations will be discussed during lectures. For surfing, it is helpful to be a bit descriptive in your search string -- I used "calendar day of week" in google.com and found a lot of helpful sites. Day of week: This calculation is known as the Doomsday algorithm and has been popularized by John Conway, a Princeton University Math Professor, who enjoys doing this calculation for any date quickly in his head. mainline.brynmawr.edu /Courses/cs110/fall2003/Project5.html   (1059 words)

 Doomsday rule   (Site not responding. Last check: 2007-10-09) Definition: An algorithm to find the day of the week for any date. Go to the Dictionary of Algorithms and Data Structures home page. Paul E. Black, "Doomsday rule", in Dictionary of Algorithms and Data Structures [online], Paul E. Black, ed., U.S. National Institute of Standards and Technology. www.nist.gov /dads/HTML/doomsday.html   (117 words)

 Bob Congdon Using a patented compression algorithm in a widely available data format (with an aggressive patent holder, Unisys) has been an issue for commercial software that manipulates GIF images for more than a decade now. Terry Welch's refinements to the algorithm were published in 1984. Newsmap is an application that visually reflects the constantly changing landscape of the Google News news aggregator. www.bobcongdon.net /blog/2004_06_01_congdon_archive.html   (4788 words)

 Keith Devens - Weblog: The Doomsday Algorithm - August 03, 2003 Keith Devens - Weblog: The Doomsday Algorithm - August 03, 2003 Via Simon, check out the Doomsday Algorithm, which lets you calculate the day of the week for any date. With a little work at memorizing this and getting proficient at it, you may never have to ask "What day is that again?" when setting up a meeting keithdevens.com /weblog/archive/2003/Aug/03/DoomsdayAlgorithm   (110 words)

 Perpetual Calendar in ZhurnalWiki The Dickerson-Zimmermann household tends to work collaboratively on crossword puzzles, and the other day somebody picked up the Sunday New York Times magazine and expressed mild astonishment that I had filled in "TUES" as the answer to the cryptic clue "January 27, 1756 (Mystery Person's birthdate), e.g.". It's known around here that I've been trying to learn a perpetual calendar system, the John Horton Conway "Doomsday Algorithm". So the assumption was that I had mentally computed what day of the week the puzzle referred to. zhurnal.net /ww/zw?PerpetualCalendar   (327 words)

 [No title]   (Site not responding. Last check: 2007-10-09) The Doomsday Algorithm It's the last day of Jan. or of Feb. that will do (Except that in Leap Years it's Jan. thirty-two). Then in the even months use the month's day And for odd ones add four, or else take it away, According to length, or simply remember: You only subtract for Septem. Now to work out your Doomsdays the orthodox way, Three things you must add to the century day: Dozens, remainder, and fours in the latter (If you alter by sevens, of course it won't matter). www.cs.colorado.edu /~hal/doomsday.txt   (119 words)

 UrbanGrounds » Blog Archive » How Many Times Can You Fold a Piece of Paper in Half? Britney, in a single day, solved the problem and then broke the record by folding a piece of gold foil twelve times. I admit it: I’m a big numbers geek — math, stats, algorithms, etc. — you name it, I like numbers. Apparantly Jason does to, as I just realized that I also first learned about the Doomsday Algorithm from Jason’s blog. urbangrounds.com /?p=568   (487 words)

 Computer Science - Perry Smith First, the Arabic mathematician, Muhammad ibn Musa Al'Khowarizmi, who published a book in the twelth century about a step-by -step problem solving procedure. He titled the book, "algorithms." I also want to mention Alan Mathison Turing. In 1936, while he was still a graduate student, Turing published a paper called "On Computable Numbers," which introduced the concept of a theoretical computing device now known as a Turing machine. www.perryland.com /cs.shtml   (265 words)

 EDUCATION PLANET: 1835 Calendar sites Quickly search online educational resources including over 80,000 teacher reviewed online lesson plans. Doomsday Algorithm for Day of Week - The Doomsday algorithm gives the day of the week for any date (and you can do it in your head). Lunar Calendar in Japan - Most people think of the Japanese lunar calendar as being basically the same as that used in China. www.educationplanet.com /search/Language_Arts/Calendar   (364 words)

 The World of Stuff   (Site not responding. Last check: 2007-10-09) (It was designed by the same person who came up with the Doomsday algorithm.) Sure, the plane used in the "game" is supposed to be infinite, but for the sake of convenience, I made it 12x12. A few months ago, I mentioned having learned the Doomsday Algorithm for finding the day of the week based on a given date. Now the page is finished, and I think it serves as a good all-around guide to the Doomsday Algorithm. theworldofstuff.com   (6396 words)

 3sc1 Even if we suppose that "this algorithm" was around in the 1580's (the Conway now teaches the Doomsday algorithm, complete with Century The Doomsday Difference is the difference between the required date and a www.angelfire.com /dc2/calendrics/CALNDR-L/98/FEB/13sc1.html   (462 words)

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