A. means to measure...

as a review...

74 days = 1776 hours
78 days = 1872 hours

1872000 are the days in the current Mayan Long Count calendar,
dated 12.21.2012, Winter Solstice

July 4th, 1776 is the day of US indenpendence
July 4th, 2013 is also the Perihelion, the day Earth is closest to the sun.

Winter Solstice, December 21, 2012, Mayan Long Count 'end' date
 continues with PLUS 195 days
landing us on July 4th, 2013, Perihelion and also our Independence day.

between
74 days and 78 days are 96 hours (the difference), four days

Pakal, Pacal, the Mayan Lord Shield, as I compare, said "show the count" of the 7, 4 and 13, "in this way..."

7 4 1 3
7 4 3 1
1 3 4 7
3 1 4 7

There are two messages here.

3 + 3 + 3 + 3 = 12
741 + 741 + 147 + 147 = 1776

their sums
12 x 1776 = 21312 and applying 'english' gematria 2=B, 1=A, 3=C, 1=A, 2=B
making invisible, the numbers... BACAB

"  The Bacab "were four brothers whom God placed, when he created the world, at the four points of it, holding up the sky so that it should not fall. [...] They escaped when the world was destroyed by the deluge." ^[1] Their names were Hobnil, Cantzicnal, Saccimi, and Hosanek. Each ruled one of the directions and the associated Year Bearer day (one of four New Year days). The four brothers were intimately associated with the four Chaacs, or rain deities, and the Pauahtuns, or wind deities, who were equally associated with the four directions. The Maya of Chan Kom referred to the four skybearers as the four Chacs (Redfield and Villa Rojas)...." wiki

bacab
21312
there are 213 'musical boxes' on the arches of Rosslyn chapel ... and there are 13 days in 312 hours...
"... The link was made by Stuart Mitchell, 41, a composer, who with his father Thomas, 75, a former RAF codebreaker, deciphered a musical score they believe was hidden in the 13 angel musicians and 213 cube-like shapes carved on the chapel arches...."
The Telegraph.co.uk

so let us review the measure... "cycles"

the Mayan Long Count as scholars translated it...
Kin ..........1 x 20
Uinal.........20 x 18
Tun...........360 x 20
Katun.........7200 x 20
Baktun........144000 x 13
Great Cycle...1872000 'days'

so it was to 'count the cycles'...
20+18+20+20+13 = 91
......TT......

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10  + 11 + 12 + 13 = 91
similar to 'steps' in the Pyramid of the Sun.
four times... so
A B C D E F G H I J K L M = 091 x 4 = 0364 which means to also do

N O P Q R S T U V W XYZ = 260 four times = 1040
14 + 15 + 16 + 17 + 18 + 19 + 20 + 21 + 22 + 23 + 24 + 25 + 26 = 260
aka Mayan Tzolkin
also known as Monday, Tuesday, Wed, Thurday, Friday x 52 'weeks' in a modern calendar year = 260

and their sums 0364 + 1040 = 1404 divided by 78 are 18 "the other number"
the Mayan 'factors' are 13 and 18 and 20

The Mayan built their pyramids 9 levels tall...

1 x 13 = 13
2 x 13 = 26
3 x 13 = 39
4 x 13 = 52
5 x 13 = 65
6 x 13 = 78
7 x 13 = 91
8 x 13 = 104
9 x 13 = 117
..sums = 585

notice
104
117
are the two steps where three numbers enter, the third numbers being seven and four

seven and four
g .... and ... d;
" be, the change "

levels
H 8 = 104 D
I 9 = 117 G

" hi, G ;D "

pyramid look like this...
5 'corners'
8 'lines'
5 'faces', earth included.

Using the fives on both rows...
1 2 3 4 5 6 7 8 9 10 11 12 13 = 91 x 5 = 455 and x 8 = 3640
14 15 16 17 18 19 20 21 22 23 24 25 26 = 260 x 5 = 1300 and x 8 = 10400
their sums
455 + 1300 = 1755 / 585 = 3 'pyramid' like those in Giza perhaps....
their additional sums
10400 + 3640 = 14040 / 585 = 24

It becomes easier to see...

"A" ,  means to measure...
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10  + 11 + 12 + 13 = 91
A... 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10  + 11 + 12 + 13 = 90 x 4 = 360 'tun' also known as, 'circle'

3 x 24 = 72
24 / 3 = 8

and 72 / 8 = nine ... level pyramids