In November 18 the Breast of Cassiopeia (the star named Schedir) culminated (at 21h):
 
July 5 (186, *106) *4 July 9 (190, *110) *132

Nov 18 (312, *242)

Ea7-16 (233 = 369 - 136) Ea7-20 (237) Eb2-1 (369)
    SCHEDIR

I had decided to use a convention for finding the stars observable close to the vertical line connected with the Full Moon (the nakshatra method) in order to find the place of the Sun against the background of the fixed stars not visible because of the blazing rays from the hot Sun. This convention is to take 366 / 2 = 183 and count backwards or forwards (which will give the same result in my documentation system).

Thus with the Full Moon ideally at November 18 (322, *242) - assuming the year was not a leap year - this would have coincided with the Sun in day 322 - 183 = 139 (May 19, *59):

July 5 (186, *106) *4 July 9 (190, *110) *132

Nov 18 (322, *242)

Ea7-16 (233 = 369 - 136) Ea7-20 (237) Eb2-1 (369)
7h (106.5)   SCHEDIR
19h (289.2)   May 19 (139 = 322 - 183)
  *59 = 139 - 80

The Breast (Schedir), as it evidently had been illustrated on the center of the back side of the Phaistos disc,

would thus have been seen to culminate *183 right ascension days after *59 (↔ 2 * 29½). In other words, the Sun would at that time be half a year away at right ascension day *242 - *183 = *59.

And 136 right ascension days earlier than May 19 (*59) was 19h, because we should count *366 + *59 - *136 = *289.

The culmination dates occurred 46 days earlier than according to the current calendar

... Allen has documented all his star culminations at 21h, which could be due to an effort of keeping the culminations at their proper places according to the ancients, 24h (spring equinox) - 21h = 3h = 24h / 8 = 45º. 3h corresponds to 366 / 8 = 45.75 of my right ascension days and *366 - *46 = *320 (Dramasa, σ Octantis) ...

and we could therefore count *59 - *46 = *13 (80 + 13 = 93, April 3).

This suggests July 5 could have been regarded as a kind of ancient day zero (*0). Currently Schedir was rising together with the Sun in day 88 (*8) - i.e. in March 29.

If Schedir had been regarded as day zero, then we could imagine *13 (April 3) as the sum of *5 and.*8 Which then might explain the nature of (the character) number 13 (Moon): It could have indicated the Sky and it was used by the Mayas for their sacred Tzolkin.

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... An iconographic study by Jeff Kowalski suggests a cosmological layout for the Nunnery. The higher placement of the North Building, with its 13 exterior doorways (reflecting the 13 layers of heaven), and the celestial serpents surmounting the huts identify it with the celestial sphere ...

above earth 8 + 5 27(0) 36(0)
down on earth 7 + 7
below earth 9(0)