A synodic month, when set with the exactness of four decimal places to 29.5305, gives two new moons of 59.061 nights, while two calendar months have the length of 60.873 days. That is: the fraction of 0.061 makes up a 1/1000 part of those days. This curiosity makes a 61 table convenient in a luni- solar calendar, in that this relation is continued up till the fraction 0.366. This does it possible to take the reading that 354.366 nights correspond with 6 double-months of 365 days (61x6)+1. Now the serie gets out of line, as quadrilaterals do; but it showed some relations between the number 61 and the sync. of the circles of the sun and the moon.

Modulus calculations of fractions was used in the moon calendar in ancient times. A table of 29.5 with twelve entries written as {29, 59, 88, 118, 147, 177, 206, 236, 265, 295, 324, 354}.
A table of 5.5 : {6, 11, 17, 22, 28, 33, 39, 44, 50, 55, 61, 66}. Or if rounded off to the lower figure {5, 11, 16, 22, 27, 33, 38, 44, 49, 55, 60, 66}.
A decisive reckoner according to the Phaistos disc is an altering table of { 5, 7, 5, 7,...}, or its prolongation to {12 ,17, 12, 17, ...}, which has a significant geometrical expression. .

The well-known eleven days room between the sun- and the moon year (his passage through the zodiac), together with another detail ; 7 -66 =59, 7 +66 =73, connects the two celestial bodies with multipla of eleven. That much about the visibility of 11 and 61 in the sun-, moon relation. Now it is time to search the inscription for definable groups of elements counting 29 or 30.
For you who admit, you conceive my gnomonical arrangement of the stem-elements, I shall try to disentangle a (29,5 x12) +11 calendar.
The upper half part of the frame consist of the 59 stem-elements, deducted for 7 unsuitable stems (2z), and 4 unpaired stems (1). The 29 small bluish grape-coulered squares constitute part A's stem-elements (2x), whereas the olive squares are part B's do (2y).
The lower red-heat part of the frame contains a reduced copy of the above 59 stems added up with 7 suitable short-form stems (0), which are among the 9 uncovering reduced stems outside the frame (4). Now the reduced stems count 29 elements, which are recognisable of category I(3x) Those are the blood-orange-coulered squares of the lower frame. Furthermore we have 30 Jaffa-oranges of category II (see calendar 261), which are abbreviated by two choices (3y). Besides of the stem-signs, the inscription holds 29 unrelated elements (elements are of two units) designated remainder-signs (5).
The remaining two lunations is simply the material that is left over. Say 16 overriped apples of category III (3z) together with the 11 stem-elements in excess (2z) (1) attached with 6 of the 17 slashes. Finally 11 intercalary slashes.
Did you get it? This will tot up the numbers of sign-units in defined portions to: 29+30+29+30+29+30+29+30+29+30+29+30 =354 +11. In full accordance with a moon-calendar.

By the aid of these two tables, it becomes easy to synchronize the yearly movements of moon and sun.
7 +5 +7 +5 +7 = 31
5 +7 +5 +7 +5 = 29