At the time of Gregory XIII precession had moved spring equinox 64 (= 8 * 8) days earlier in the year since the time when Aldebaran was at 0h. At the time of rongorongo the day difference had grown to 68.
Probably the creator of the G tablet was well aware of this fact, which would explain why he did not begin his text at Aldebaran - at the Furrow of Heaven (Pidnu-sha-Shame) - but 4 days earlier.
At the time of Gregory XIII the red Aldebaran rose with the Sun in May 24 (144 = 12 * 12 = 8 * 18 = 80 + 64). Similarly also the other cardinal points of the Sun had moved earlier in the year as observed against the fixed stars, with 64 (respectively 68) days as compared to the time of Aldebaran. Midsummer had once perhaps been defined to begin 91 (= 7 * 13) days after March 21 - i.e. in June 20 both at the time of Gregory XIII and in rongorongo times - but whereas day 171 (= 9 * 19 = 80 + 91) counted from January 1 was at Canopus at the time of Gregory XIII there was no star of comparable dignity at this time of the year when the G tablet was created:
At the time of Aldebaran the feet of the Gemini Twins would have risen with the Sun about a month after the northern spring equinox. June 22 (*93) - 64 = *29.
In Roman times, 64 - 27 = 37 precessional days later, heliacal Tejat Prior (η) would have been in day *29 + 37 = *66 ('May 26) and heliacal Tejat Posterior (μ) in 'May 28 (*68):
Canopus (alias Agastya) was also there (at the right foot of Castor), sucking up all the waters of the ocean. ... The Pythagoreans make Phaeton fall into Eridanus, burning part of its water, and glowing still at the time when the Argonauts passed by. Ovid stated that since the fall the Nile hides its sources. Rigveda 9.73.3 says that the Great Varuna has hidden the ocean. The Mahabharata tells in its own style why the 'heavenly Ganga' had to be brought down. At the end of the Golden Age (Krita Yuga) a class of Asura who had fought against the 'gods' hid themselves in the ocean where the gods could not reach them, and planned to overthrow the government. So the gods implored Agastya (Canopus, alpha Carinae = Eridu) for help. The great Rishi did as he was bidden, drank up the water of the ocean, and thus laid bare the enemies, who were then slain by the gods. But now, there was no ocean anymore! Implored by the gods to fill the sea again, the Holy One replied: 'That water in sooth hath been digested by me. Some other expedient, therefore, must be thought of by you, if ye desire to make endeavour to fill the ocean ... Sirius rose with the Sun and did not belong among the fixed stars: ... The Sothic cycle was based on what is referred to in technical jargon as 'the periodic return of the heliacal rising of Sirius', which is the first appearance of this star after a seasonal absence, rising at dawn just ahead of the sun in the eastern portion of the sky. In the case of Sirius the interval between one such rising and the next amounts to exactly 365.25 days - a mathematically harmonious figure, uncomplicated by further decimal points, which is just twelve minutes longer than the duration of the solar year ... According to the Gregorian calendar Sirius had been defined to rise with the Sun in June 30 (181). This was also true in rongorongo times. I was inspired by finding Kerb (τ Pegasi) - where the water of the ocean evidently could have been refilled - viz. 68 days after Sirius: ... 'The rays drink up the little waters of the earth, the shallow pools, making them rise, and then descend again in rain.' Then, leaving aside the question of water, he summed up his argument: 'To draw up and then return what one had drawn - that is the life of the world.' ...
... In rongorongo times the first day after heliacal Sirius was when Kerb (τ Pegasi) was close to the Full Moon = September 7 (250). Thus there was a jump from Sirius at June 30 (181) to day 250 (as based on the fixed stars). 250 - 182 = 68 days had to be added in order to reach the correct star time ... The ancient Egyptians saw Sirius as the influential star which caused the waters of the Nile (and consequently also all other waters) to increase: ... Pliny wants to assure us that 'the whole sea is conscious of the rise of that star, as is most clearly seen in the Dardanelles, for sea-weed and fishes float on the surface, and everything is turned up from the bottom'. He also remarks that at the rising of the Dog-Star the wine in the cellars begins to stir up and that the still waters move ... But since the fixed stars appeared to have moved ahead in the year as compared to Sirius and the Sun, the Cross-bars over the Well at Pegasus now were not in July 1 (182) but in September 7 (182 + 68 = 250). Possibly the Mayans kept this idea alive, because we can perceive cross-barns early in their Haab (Sun) year, at least according to my reconstruction:
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