VALUE: Month
The calendar key is utilized and is a set value attributed to each month. This is the central element that will enable you to do the whole calculation in your head. It is a 12-digit number that you will need to memorise:
144 025 036 146.

Each digit represents a certain month:
 
January 1 July 0
February 4 August 3
March 4 September 6
April 0 October 1
May 2 November 4
June 5 December 6

It might initially seem difficult to memorise a 12-digit number, but consider that most telephone numbers are 10-digit numbers. If you can remember a phone number, you can memorise the calendar key.

There is an alternative way to remember this key by using a mind-peg method. If you struggle  to memorise the calendar key, the mind-peg method is described
here.


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