THE MEMORY GURU OF INDIA-Calandar

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IMPROVE YOUR MEMORY UPTO FIVE HUNDRED PERCENT WITHIN FEW HOURS

HOW TO MENTALLY CALCULATE THE DAY OF THE WEEK FOR ANY DATE

The Basic Steps

The basic steps for a date in the
years 2000-2099 are as follows:

Example date July 13th, 2004

  1. Take the last 2 digits of the year and add a
    quarter onto itself. (04 + 1 = 5)
  2. Get the corresponding code for the month.
    (January = 6, February = 2, March = 2, etc. See month codes for details).
    July = 5
  3. Take the day. (=13)
  4. Add the numbers together (5 + 5 + 13 = 23)
  5. Take away 7 (or multiples of 7) until a number
    from 1-7 is left. (23 – 21 =2)
  6. This number corresponds to the day of the week.
    (1 = Monday, 2 = Tuesday, etc.) In this case 2 = Tuesday

Other points
to take into account

Apart from the basic steps, other
elements have to be taken into account:

  • When adding a quarter of the year onto itself, if
    the quarter of the year is not a whole number, simply ignore the decimals.
    Do not round up. Therefore 27/4 = 6.75 = 6, and 2/4 = 0.5 = 0.
     
  • Leap years: subtract 1 from the total if the
    month is January or February.
     
  • Negative numbers. During the calculation you get
    0 or negative numbers, just add seven until you get a number from 1-7.
     
  • Different “centuries” *.
    • 1700s add 5
    • 1800s add 3
    • 1900s add 1
    • 2100s subtract 2
    • 2200s subtract 4

(* For this method
we have to consider a ’00’ year as part of the new century)

 

The codes for
the months

At first the hardest part is learning
the codes for the months. They are as follows:

Jan

Feb

Mar

Apr.

May

Jun

Jul

Ago

Sept

Oct

Nov

Dec

6

2

2

5

0

3

5

1

4

6

2

4

Try to use some memory system to
remember the codes for the months. For example, February is the 2nd month,
March 2 music, etc. Try to find associations that will remind you.

If need be, you can add 7 or
multiples of 7 to any of these values to help you remember them. For example,
August could be 1 or 8, and as it is the 8th month, it may be easier to
remember with 8 than with 1. This may be useful if you can match it with a
well-known date. You could remember that the code for December is 25 (4+21), or
for someone’s birthday. The negative aspect of this is that you’ll be taking
away the 7 (or multiples) towards the end of the calculations, and you’ll be
working with bigger numbers.

Leap Years

  • Remember that leap years are not always every 4 years. There are exceptions.
    Years that end in 00 are not leap years unless it is a multiple of 400.
    Therefore 1700, 1800, 1900, and 2100 are not leap years, but 2000 is.

The Gregorian
Calendar

  • The calendar as we know it only came into effect (in England)
    in 1752
    , replacing
    the Julian calendar. Changes included cutting 11 or more days out of the
    calendar and changing the first day of the year from march 21st to January
    1st, and so this calculation method should not be used for dates before
    this changeover.
  • Unfortunately, not everyone agreed to the change
    at the same time. The change was in fact officially enacted in 1582, but
    only some catholic countries actually did change at this time. After this
    other countries took their time before accepting the change. Great Britain in 1752, Japan in 1873 and China (the last) in 1949. In
    several cases, such as Germany,
    only some regions changed at a time, and Sweden removed the days one by
    one over a long time.
  • The overall result of this is that for
    centuries, each country had its own system, and dates did not fall on the
    same day. if you are looking at a date, you need to take into account if
    it was before the changeover in that country, and take into account the 10
    (or more) days removed from the calendar, the  fact that the years used to start on a
    different day.

Shortcuts

There are several shortcuts that can
be used to simplify and speed up the process so that you can calculate the
result almost immediately.

·        
When working out
the year, remember that as
the
calendar repeats itself every 28 years within each “century”
, we can subtract 28 or multiples of
28 (56 or 84) so it is easier to add a quarter on to the year if it is a
smaller number. Therefore 1996 is the same as 1996-84 =1912. It is much easier
to add a quarter of 12 onto itself, than a quarter of 96. In this way, the
greatest number you will have to work with is 27.

·        
When the year is a
multiple of 4, such as 16, it is very easy to add a quarter (16/4=4  
16+4 =20.). Some people may have problems when the number is not a multiple of
4. (e.g. 27/4). Because we do not need the decimals in the result, the easiest
and quickest way is to take the nearest multiple of 4 below the number, and
calculate a quarter of that, adding it onto the year. (e.g. 1927: the nearest
multiple of 4 below this is 24. 24/4=6. add 6 to 27 to get 33.) Many people may
find this easier than working out the division and then eliminating the
decimals (27/4=6.75. eliminate the decimals to get 6. add 6 to 27 to get 33)
 

·        
It is good
practice to subtract 7 or multiples of 7 at this point rather than adding on
the month and the day before doing it. The same is true for the day. This is
because it is easier to recognize and subtract multiples of 7 from smaller
numbers.
 

·        
Simply remembering
the final year code for the current year and the coming year makes instant
calculations possible, as calculating the year code is the time-consuming
process.
For the years 2000-2003, the numbers
correspond to the last digit of the year
. This is a very quick method.

Examples

The thought process for a date such as
20/12/1967 should be as follows: (explanations are in parentheses)

67- 56 = 11

(Take multiples of 28 from
the year – 84, 56 or 28)

11 + 2 = 13

(Add a quarter of the
nearest multiple of 4 below the number, in this case the nearest multiple is
8, so a quarter of that is 2)

13 – 7 = 6

(Take away 7 or multiples of
7. This leaves us the year code)

December = 4

(The code for the month from
the table above)

20 – 14 = 6

(Take away 7 or multiples of
7 from the day.)

6 + 4 + 6 = 16

(Add the codes for the year,
the month and the day)

16+1=17

(Add 1 if the date is in the
1900s)

17 – 14 = 3

(Take away 7 or multiples of
7)

3 = Wed

(The final number indicates
day of the week)

For a date in
2000, 2001, 2002 or 2003, remember that the year code is simply the last digit,
so for a date in any of these years, we already know the year code.

So, to work out a date in 2000, we
forget the year code: for example 4th August 2000

August = 1

(The code for the month)

1+4=5

(Add the codes for the month
and the day)

5 = Friday

(The final number indicates
day of the week)

 

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