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'Rubbish!' you might say, but when this system is explained you will see that it is in fact very clear and easy to operate. The individual digits of the 12-digit number represent the first Sunday for each month of the year 1971. The first Sunday in April, for example falls on the 4th day of the month, the first Sunday in December falls on the 5th day of the month, and so on.

Once you have remembered this number, and I recommend that you remember it in the way that was explained in the Long Number memory system chapter, you will rapidly be able to calculate the day of the week for any date in the year.

It is best to explain this concept with examples, so let us assume that your birthday fell on April 28th, and that you wished to know what day the date represented. Taking the 4th digit from your memory number you would realise that the first Sunday fell on the 4th. By the process of adding sevens to this initial Sunday date you rapidly calculate that the second Sunday of the month fell on the nth (4 + 7 = 11); the third

Sunday of the month fell on the 18th (11 + 7 = 18) and that the last Sunday of the month fell on the 25 th. Knowing this you recite the remaining dates and the days of the week until you arrive at the date in question: April 26th = Monday; April 27th = Tuesday; April 28th = Wednesday. In other words your birthday falls on a Wednesday in the year 1971!

Suppose you wish to know the final day of the year. The process is similar. Knowing that the 1st Sunday of the last month falls on the 5th day you add the three sevens representing the following Sundays to arrive at Sunday 26th. Reciting the next few dates and days we get: 27th Monday; 28th Tuesday; 29th Wednesday; 30th Thursday; 31st (the last day of the year!) a Friday.

As you can see this system can be applied to any year for which you may especially need to know days for dates. All you have to do is to make up a memory number for the first Sunday, or for that matter the first Monday, Tuesday, etc. of each month of the year, add sevens where appropriate to bring you near to the day in question, and recite to that day.

An interesting and quick way to make use of the memory number of one year with relation to surrounding years is to realise that with each year the first date for-the days at the beginning of the month goes down one, with the exception of leap years when the extra day produces a jump of two for the following year. In the years 1969, 1970, 1971 for instance the first Sunday for January in each of those years fell respectively on the 5th, 4th, and 3rd days of the month.

The second of the two systems to be introduced in this chapter is for calculating the day for any date from 1900 to the present. It is necessary in this system to ascribe to each month a number which will always remain the same. The numbers for the months are as follows:

January

February

March

April

June

July

August September

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