Computing the Year Value – an alternate method
Here is are two alternative methods people may wish to think about
for computing the year value. They are not pure methods, but they work, and so
if they work for you better, use one them.
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For those who wish to avoid the sometimes cumbersome computation
for year value of subtracting from the last two digits of the year the highest
multiple of 28 in it, that is, 28, 56 or 84, there are two other ways to get
the value.
The first way is of course to memorize the above 100 cell
chart of years and values, 200 numbers in all, 100 for the years, 100 for the
values. If you can do that, do it, but good luck.
The second way is to memorize not three numbers (the 7X4
pivotal years of 28, 56 and 84) but four of the numbers on the above chart, the
pivotal leap decade years (shown in purple, above) and their values, i.e., 20=4,
40=1, 60=5, and 80=2. These numbers can be memorized not as eight numbers but only
four (forget about 00=0 because that is zero): 24, 41, 65 and 82, the tens (left)
digit being the decade and the units (right) digit being the value for that
pivotal decade year. Then all you need to do is to subtract the lowest pivotal
decade from the year and divide that by 4 dropping the decimal, then add those
two numbers together, and finally add that number to the value for the pivotal
decade year. The largest number you will have to deal with is (for, say, 19, 39, 59, 79, and 99) 19/4=4+19=23 (plus the pivotal year value) and
not some number like 55-28=27/4=6+27=33.
The only problem with this method is that when you divide the
number by 4, it does not automatically tell you if a year is a leap year in
half of the years, so you need to figure out some other way to signal to you
that a year is a leap year and may require an adjustment of -1 if the month is
January or February. It works, of course, for the even pivotal decade years,
but not for the odd ones. With the odd ones, if the remainder is 2 (.5), it is
a leap year. Otherwise, the method works just as well 100 percent of the time.
