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hcs Special user Germany, Magdeburg 508 Posts 
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Quote:
On 2010-05-02 09:36, TomasB wrote: I'm very sorry. Of course mod is much more common then div. Quote:
So if I bake the lonely 6 into the M code I get Here is a simple way invented by Lewis Caroll in 1887. the "Method of Dozens" is very common: y' = [y int 12 + y mod 12 + (y mod 12) int 4]mod 7. Formula looks terrible but it is very simple. Example 1929 y' = [29int12 + 29 mod 12 + (29 mod 12)int4] mod7 (29/12 ==> 2 remainder 5 and 5 int 4 ==> 1) y' = (2 + 5 + 1)7 = 8 ==> 1 („29 includes 2 dozens and remainder 5, remainder 5 includes 1 leap year") (There are still other simple calculation methods). |
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hcs Special user Germany, Magdeburg 508 Posts
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Quote:
On 2010-05-01 16:07, hcs wrote: As I am reading now in my own book Abel Stroock's formula was published in the same form by the Russian S. Drozdov in 1954 in "kratky astronomichesky kalendar na 1955 g. (short astronomical calendar for year 1955). |
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hcs Special user Germany, Magdeburg 508 Posts
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I only have seen
Quote:
On 2010-05-02 09:36, TomasB wrote: div means "floor" or "int" not "mod". |
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PatBee67 New user 11 Posts
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Does anyone know how Zufall's method compares to Dominic O'Brien's method as published in "How To Develop A Perfect Memory" ?
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Scott Cram Inner circle 2678 Posts
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PatBee67, The formula in both is the same, as it pretty much has to be.
The main differences are: 1) The particular mnemonic codes for letter that is used (Dominic uses 0=O, 1=A, etc., while Zufall uses the standard phonetic alphabet, 0=S, 1=T/D, etc.). 2) Zufall has you memorize the year codes as words/phrases, while Dominic has you put groups of years in their appropriate metal "rooms". 3) Zufall uses 0 for Sunday, up to 6 for Saturday. Dominic uses 1 for Sunday, up to 6 for Friday and 0 for Saturday. This last one doesn't really matter, assuming your other key numbers are adjusted appropriately. BTW, regardless of which system you use, there's some great mp3 Day For Any Date training files available for free. They're available in both Day/Month/Year order and in Month/Day/Year order, and feature pauses of various lengths from 30 seconds all the way down to 3 seconds. |
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PatBee67 New user 11 Posts
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Thank you Scott for your clear explanation of the differences.
I do have Dominic O'Brien's e-book but did change the mnemonics for the numbers, as appears now just like Zufall, to the phonetic alphabet that I've been using since long. Do you see any advantage to using the words/phrases for the years as opposed to learning which number (person) is situated in which particular mental room? I assume that Zufall has a method that groups those words? Rgds, Patrick |
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Scott Cram Inner circle 2678 Posts
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In Zufall's method, the years aren't really "grouped". The last 2 digits of each year (59, for example, from 1959) are linked with the year code (3 for 1959) through the use of a word ("album" translates to 593, indicating that the key for 1959 is 3).
You're basically remembering 100 words, made from the last 2 digits of the year plus the digit for the year code. |
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hcs Special user Germany, Magdeburg 508 Posts
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In my book "Encyclopedia of weekday calculation" I explain a more modern solution for linking the year's digit keyword with year. I'm IMHO the first with a SIMPLE mental extension for the full 400 year cycle (chapter 8.3).
It is necessary to learn the 100 coded words for the 2 year digits only but not twice for year digits and years as Zufall explains! http://www.lybrary.com/kalender-kopf-gral-p-35993.html |
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hcs Special user Germany, Magdeburg 508 Posts
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BTW I've presented the opening show on the Mental Calculation World Cup in June 2010. Freddies Reyes Hernadez from Cuba is the new world record holder in weekday calculation with 74 calculations in one minute and 20 calculations (one century) in 13,47 sec. (see photo).
...I know Freddies personal records. they are much higher! Click here to view attached image. |
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hcs Special user Germany, Magdeburg 508 Posts
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Here comes of photo of Freddies and me on Mental Calculation World Cup in Magdeburg, Germany.
The "other all" winner was a young indian girl. Click here to view attached image. |
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Scott Cram Inner circle 2678 Posts
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Here's a video of Freddis Reyes Hernandez in action. Get ready to drop your jaw!
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TomasB Inner circle Sweden 1144 Posts
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WOW! I didn't even have time to read most of the dates. Supernatural. I demand that he gets the million dollars from JREF.
/Tomas |
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stanalger Special user St. Louis, MO 998 Posts
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Hernandez is fast, but he's no longer the fastest.
Jan Van Koningsveld from Germany is the new Mental Calendar World Recold Holder with 78 correct dates in one minute. |
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Michael Daniels Inner circle Isle of Man 1609 Posts
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Those learning Day for Any Date may be interested in the new improved version of my free interactive practice tool, which now includes solution times.
http://www.mindmagician.org/daydate.aspx Mike |
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hcs Special user Germany, Magdeburg 508 Posts
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Quote:
On 2010-10-07 17:01, stanalger wrote: Here is a photo. On the left is Jan van Konigsveld, on the right side is the German Robin Wirsing. Robin is also able to do more the one calculation per second. Click here to view attached image. |
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hcs Special user Germany, Magdeburg 508 Posts
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Sorry: Jan van Koningsveld and Robin Wersig!
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ssakgul New user 1 Post
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Hi everybody. I've just found this forum. I am not as fast as these men, but I found a new method for the calendar. I used the "method" word instead of formula, because it has no number or it needs no calculation such as addition, substraction, multiplication or the remainder. I am preparing a document for it, but it needs some corrections. When it will be finished, I want to publish it by a Creative Commons license.
PS. I've sent already the drafts to the mentioned Super Calendar Men. |
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Scott Cram Inner circle 2678 Posts
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Quote:
On 2010-10-07 17:01, stanalger wrote: Here's a video of Jan Van Koningsveld'......ormance! Quote:
On 2010-11-05 14:05, ssakgul wrote: Thank you for this! I've found this document posted over at Yahoo's MentalCalculation Group's files section (listed as CCWN.7z). Once you download it and unpack it, you'll have a password-protected PDF, and instructions on how to contact the author for the password. |
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stanalger Special user St. Louis, MO 998 Posts
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Yusnier Viera Romero has set some new records:
http://www.recordholders.org/en/records/dates.html 93 dates in 1 minute! |
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Santiago New user Argentina 75 Posts
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I've learned this algorithm and I think it's great. I love it because it's really easy.
It's called Doomsday Algorithm, and as you'll find, it gives the day of the week for any date (and you can do it in your head). I hope this helps you 
By the way Quote:
On 2010-11-05 14:05, ssakgul wrote: This sounds really great! I'll be waiting 
Welcome to the Café Ssakgul! |
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| The Magic Cafe Forum Index » » Magical equations » » Which day, but for 1900-2000?? (0 Likes) | ||||||||||
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Posted: May 3, 2010 09:28 am 
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