Possibly there could be a connection between what I have called the 'compressed henua calendar' which stretched from χ Gemini and Naos towards the Scorpion on one hand and on the other the hand (toga hora) signs early in line Ga2:

Ga2-1		Ga2-2	Ga2-3	Ga2-4
January		February	March	April
Ga2-5		Ga2-6	Ga2-7	Ga2-8
May		June	July	August
Ga2-9		Ga2-10	Ga2-11	Ga2-12
September		October	November	December

From July 1 to November 1 there were 305 - 182 = 123 days. At the time of Gregory XIII the star Mekbuda (Contracted, ζ Gemini, at the short left leg of Pollux) rose with the Sun (and with Sirius) in °June 30 (181). Contracted is practically the same thing as compressed (or shortened).

The right front arm of the White Tiger was outstretched (hora) - as in the name Mebsuta (ε Gemini at Gb2-6) - and possibly it meant the White Goddess (Moon, the White Tiger) ruled also in the month when Father Light (Jupiter) was decapitated and during the time when the beak of the Red Bird with outstretched wings appeared, at Gemini. Once upon a time the red of dawn (and the rest of the colours of the Rainbow) would have come at the Twins, possibly corresponding to the Horse and the Stag who also were facing each other:

... A man had a daughter who possessed a wonderful bow and arrow, with which she was able to bring down everything she wanted. But she was lazy and was constantly sleeping. At this her father was angry and said: 'Do not be always sleeping, but take thy bow and shoot at the navel of the ocean, so that we may get fire.' The navel of the ocean was a vast whirlpool in which sticks for making fire by friction were drifting about. At that time men were still without fire. Now the maiden seized her bow, shot into the navel of the ocean, and the material for fire-rubbing sprang ashore.

Then the old man was glad. He kindled a large fire, and as he wanted to keep it to himself, he built a house with a door which snapped up and down like jaws and killed everybody that wanted to get in. But the people knew that he was in possession of fire, and the stag determined to steal it for them. He took resinous wood, split it and stuck the splinters in his hair. Then he lashed two boats together, covered them with planks, danced and sang on them, and so he came to the old man's house. He sang: 'O, I go and will fetch the fire.' The old man's daughter heard him singing, and said to her father: 'O, let the stranger come into the house; he sings and dances so beautifully.' The stag landed and drew near the door, singing and dancing, and at the same time sprang to the door and made as if he wanted to enter the house. Then the door snapped to, without however touching him. But while it was again opening, he sprang quickly into the house. Here he seated himself at the fire, as if he wanted to dry himself, and continued singing. At the same time he let his head bend forward over the fire, so that he became quite sooty, and at last the splinters in his hair took fire. Then he sprang out, ran off and brought the fire to the people ...

... Lulal & Latarak (the Lion) below the Hired Man were at this place and according to Mul-Apin they stood for Cetus and a part of Eridanus. The left foot of Lulal (with a whip like Castor) was evidently on the border line between the 4th quadrant and the new cycle, which resembles the structure described for Gemini. Pollux could then correspond to Latarak and our Gemini be a repetition of an ancient mind pattern for where the Sea Beast reached Land at Eridanus - Gemini reaching Land after the Milky Way River (and using 3 of their feet for pushing seeds into the mud as anciently had been done with help from sheep) ... On the Euphrates it [Vindemiatrix] may have been Kakkab Mulu-izi, the Star Man of Fire, possibly symbolizing the god Laterak, the Divine King of the Desert; although that title has been assigned to μ Virginis and δ Librae ... Wikipedia: Ugallu, the 'Big Weather-Beast' ... Akkadian: umu rabû, meaning 'big day', was a lion-headed storm-demon and has the feet of a bird who featured on protective amulets and apotropaic yellow clay or tamarisk figurines of the first millennium BC but had its origins in the early second millennium. The iconography changed over time, with the human feet morphing into an eagle’s talons and dressing him in a short skirt. He was one of the class of ud-demons (day-demons), personifying moments of divine intervention in human life ... Ugallu was one of the eleven mythical monsters created by Tiamat in her conflict with the younger gods, on the reverse of the first tablet of the Epic of Creation, Enûma Eliš. The tale describes how Marduk captured and bound the creatures, rehabilitating them with work reconstructing the world from the corpses of his vanquished adversaries. This transformed them into protective charms which would be used to adorn the doors of palaces, for example that of Ashurbanipal’s southwest palace at Nineveh, temples, such as the Esagil of the Marduk temple as described in the Agum-Kakrime inscription, and private dwellings (the bedrooms of the vulnerable) to ward off evil and disease. Sometimes in pairs of ugallu, the beneficial protective demon finds special purpose in adorning the outer gates of buildings.Ugallu first appears figuratively in the Old Babylonian period as a porter of the underworld, a servant of Nergal. In later times he is represented on amulets as frequently paired with the Sumerian demon Lulal, who was in many respects fairly similar in appearance. He is portrayed clasping a dagger, and described thus: 'a lion’s head and lion’s ears, it holds a … in its right hand and carries a mace (gišTUKUL) in its left, it is girded with a dagger, its name is ugallu' ...

Rei in Ga2-27 (at Naos) was determined to be glyph 57 counted from the beginning of side a, and 50 + 57 = 107 = 471 - 364.

		43			3
Cb2-5	Cb2-6 (414 + 4 + 4)		Ga2-6	Ga2-7		Ga2-11 (41)
6 stones (Tau-ono)	ALCYONE,  PLEIONE, ATLAS		MEBSUTA (Outstretched)	Φ Sagittarii (South Dipper, Unicorn) SIRIUS		NUNKI MEKBUDA (Contracted)
May 15 (135)	45			June 30 (181)		July 4 (185)
	50

The extraordinary Ga2-29 (alluding to the number of glyphs on side a of the tablet) was at the 'Covered Up' (Tegmine, ζ Cancri) star which at the time of rongorongo happened to be 123 days after 0h:

*MAY 10	11	12	13 (*53)	14	15
Ga2-24	Ga2-25	Ga2-26	Ga2-27	Ga2-28	Ga2-29 (59)
φ Gemini (118.4)	DRUS = χ Carinae (119.9)	ω Cancri (120.2)	8h (121.7) χ Gemini (121.0), NAOS = ζ Puppis (121.3)	ρ Puppis (122.0), HEAP OF FUEL = μ Cancri (122.1), ζ Monocerotis (122.3),  ψ Cancri (122.6), REGOR = γ Velorum (122.7)	TEGMINE (Covered Up) = ζ Cancri (123.3)
July 17	18	19 (200)	20 (*121)	21	22 / 7
NAKSHATRA DATES:
*NOVEMBER 9	10 (314)	11	12	13	14
ι Sagittarii (301.2), TEREBELLUM = ω Sagittarii, ξ Aquilae (301.3), ALSHAIN (Falcon) = β Aquilae (301.6), φ Aquilae (301.8)	ε Pavonis, θ Sagittarii (302.3), γ Sagittae (302.5), μ Pavonis (302.7)	τ Aquilae (303.8)	20h (304.4) η Sagittae (304.2), δ Pavonis (304.4)	SHANG WEI (Higher Guard) = κ Cephei (305.2), θ Sagittae (305.4), TSEEN FOO (Heavenly Raft)  = θ Aquilae (Ant.) (305.6), ξ Capricorni (305.8)	TSO KE (Left Flag) = ρ Aquilae (306.3)
January 16	17	18 (383)	19	20	21

Ga7-10 (heliacal Acrab at the end of the compressed henua calendar) was glyph 179 = 56 + 123 (= the distance from July 1 to November 1). It suggests 403 (= 31 * 13) days in some way could correspond to 123 glyphs, in case it would be like a compression (contraction, shortening) amounting to 40 weeks = 280 days.

And 364 - 280 = 84 = the Julian day number for spring equinox. 348 (glyphs on side b of the C tablet) + 123 = 471 (number of glyphs on the G tablet). 1½ * 314 - 12 * 29 = 123.

Sirius stood still in spite of the precession, causing a star view compression on one side and the opposite at the other side. In a Sun calendar, however, this could have been viewed as a stretching out of the season before Sirius - to begin earlier and earlier among the stars - followed by a complementary contraction (among the stars) from Sirius to autumn equinox.

 

May 15 (135) + 45 = 180 (Mebsuta) and Acrab (323, Ga7-10) - 45 = 278 (Diadem, just above and after Vindemiatrix):