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I imagine the pattern with 6 days at the beginning of side a and the beginning of side b on the C tablet possibly could be due to the use of a Sun year with 366 days. In ancient Egypt they had a calendar with 360 days and then added 5 more extra nights.

The character of the G text is different. Instead of 6 days of origin there may have been 8 nights of origin counted from Gb1-4:

 
Gb1-1 (231) Gb1-2 Gb1-3 (*360) Gb1-4 Gb1-5
Deneb Okab (294.0), α Vulpeculae (294.9) ν Aquilae (Ant.) (295.0), Albireo (295.5) μ Aquilae (296.3), ι Aquilae (Ant.) (296.8), κ Aquilae (Ant.) (296.9) ε Sagittae (297.1), σ Aquilae (Ant.) (297.4), Sham (297.8) β Sagittae (298.0), χ Aquilae (298.3), ψ Aquilae (298.8)
Aludra (111.1), Gomeisa (111.6) Ghost-23 Al Dhirā'-5 / Punarvasu-7 Markab Puppis (114.7), Procyon (114.9) α Monocerotis (115.4), σ Gemini (115.7)
ρ GEMINI (112.1)

Antares

CASTOR (113.4)
January 9 10 11 12 (377) 13
July 10 11 12 (193) 13 14
Gb1-6 (236) Gb1-7 (*300) Gb1-8
υ Aquilae (299.1), Tarazed (299.3), δ Sagittae (299.6), π Aquilae (299.9) Sravana-23 ι Sagittarii (301.2), Terebellum, ξ Aquilae (301.3), Alshain (301.6), φ Aquilae (301.8)
ζ Sagittae (300.1), ALTAIR (300.3), ο Aquilae (300.5), Bezek (300.8)
POLLUX (116.2) Azmidiske (117.4) no star listed (118)
January 14 15 (380) 16
July 15 16 17 (198)
 
Gb1-9 Gb1-10 (240) Gb1-11 Gb1-12 Gb1-13 (*306)
ε Pavonis, θ Sagittarii (302.3), γ Sagittae (302.5), μ Pavonis (302.7) τ Aquilae (303.8) 20h (304.4) Shang Wei (305.2), θ Sagittae (305.4), Tseen Foo (305.6), ξ Capricorni (305.8) Tso Ke (306.3)
η Sagittae (304.2), δ Pavonis (304.4)
Drus (119.9) no star listed (120) 8h (121.7) ρ Puppis (122.0), Heap of Fuel (122.1), ζ Monocerotis (122.3), Regor (122.7) Tegmine (123.3)
Naos (121.3)
January 17 18 (383) 19 20 21
July 18 19 (200) 20 21 22

Perhaps from the glyph numbers the nakshatra night numbers could be derived by subtracting 40, e.g. 240 (Gb1-10) - 40 = 200 (July 19). And then similarly:

May 25 26 27 28 29 30 (150)
Ga1-1 Ga1-2 Ga1-3 Ga1-4 (*68) Ga1-5 Ga1-6
θ² Tauri, AIN, θ¹ Tauri (65.7) no star listed (66) no star listed (67) ALDEBARAN (68.2), Theemin (68.5) no star listed (69) no star listed (70)
- 39 -38 -37 -36 -35 -34
325 326 327 328 329 330
November 21 22 23 24 25 26
χ Scorpii (245.1), Yed Prior, δ Tr. Austr. (245.5) Yed Posterior, Rukbalgethi Shemali (246.6). δ Apodis (246.7), ο Scorpii (246.8) σ SCORPII (247.0), Hejian (247.2), ψ Ophiuchi (247.7) ρ Ophiuchi (248.1), Kajam (248.3), χ Ophiuchi (248.5), She Low, ι Tr. Austr. (248.7), ζ Tr. Austr. (248.8) ANTARES (249.1), Marfik, φ Ophiuchi (249.5),  ω Ophiuchi (249.8) γ Apodis (250.1), σ Herculis (250.3), θ Tr. Austr. (250.6), τ Scorpii (250.7)

Perhaps 6 (Ga1-6) - 40 = -34 = 364 - 34 = 330 (November 26).

However, my rule for calculating nakshatra nights from heliacal days should here lead to 150 (May 30) + 183 = 333 (November 29). We can compare with Ca3-15, where I counted 146 (May 26) + 183 = 329 (November 25):

'April 27 28 (118) 29 30
May 24 25 (145) 26 27
November 23 24 25 (329) 26
Ca3-13 (64) Ca3-14 Ca3-15 Ca3-16
kiore i te henua tapamea - tagata hoi hatu ki te ariki kiore i te henua
Hyadum II (64.2) Net-19 no star listed (66) no star listed (67)
θ² Tauri, AIN, θ¹ Tauri (65.7)
Heart-5 ρ Ophiuchi (248.1), Kajam (248.3), χ Ophiuchi (248.5), She Low, ι Tr. Austr. (248.7), ζ Tr. Austr. (248.8) Al Kalb-16 / Jyeshtha-18

ANA-MURI

γ Apodis (250.1), σ Herculis (250.3), θ Tr. Austr. (250.6), τ Scorpii (250.7)
ANTARES (249.1), Marfik, φ Ophiuchi (249.5),  ω Ophiuchi (249.8)

Ariki in Ca3-15 resembles ariki in Ga1-5. Although there seems to be 6 feathers on top of his head instead of 3 we can perceive how 3 of them in front are extra large.

If this type of ariki - with 3 great feathers in front - should refer to Antares, then we could count *69 (Ga1-5) + 180 = RA day 249. And ariki in Ca3-15 could be at *66 + 183 = RA day 249.

Gb7-30 (441) - 40 = 401 = 364 + 37 (February 6). And 37 (February 6) + 183 = 220 (August 8):

Gb7-22 Gb7-23 Gb7-24 Gb7-25 (436) Gb7-26
η Hydrae (131.0), Ascellus Australis (131.4), Koo She (131.6), ε HYDRAE (131.9) ι Cancri (132.0), ρ Hydrae (132.4) no star listed (133) ζ Hydrae (134.1) Acubens, Talitha Borealis (135.0),  ρ Ursa Majoris (135.6)
Yue (314.3), Gienah Cygni, η Cephei (314.5), γ Delphini (314.6), σ Pavonis (314.7), ALBALI (314.8)

Betelgeuze

Baten Algiedi (315.8) μ Aquarii (316.0) ε Equulei (317.8) no star listed (318)
July 30 31 August 1 2 (214) 3
January 29 30 (395) 31 February 1 2
Gb7-27 (*136) Gb7-28 Gb7-29 (440)
ρ Ursa Majoris (135.6), ν Cancri (136.0), Talitha Australis (136.1) 9h (137.0) no star listed (138)
σ¹ Ursa Majoris (137.0), κ Cancri (137.3), Alsuhail (137.5), σ² Ursa Majoris (137.6), τ Ursa Majoris (137.7), ξ Cancri (137.8)
21h (319.6) χ Capricorni (320.0), ν Aquarii (320.3), γ Equulei (320.6), ο Pavonis (320.8) δ Equulei (321.7), φ Capricorni (321.8)
Armus (319.0), Dorsum (319.3), Tsoo (319.7)
August 4 (216) 5 6
February 3 4 (400) 5
Gb7-30 (441) Gb7-31 (*140) Gb8-1 Gb8-2
Miaplacidus (139.3), Tureis (139.8) no star listed (140) Markab Velorum (141.5), Al Minhar al Asad (141.6) ALPHARD (142.3), ω Leonis (142.6), τ¹ Hydrae (142.7)
Kitalpha (322.0), Alderamin (322.9) Dai (323.5), β Equulei (323.8) γ Pavonis (324.1), Yan (324.6) Tsin (325.2), Alphirk (325.7), SADALSUD (325.9)
August 7 8 (220) 9 10
February 6 7 (403) 8 9

But here, where I have counted Gb7-30 as RA day 64 + 441 = 505 = 366 + 139, when the Sun was at Miaplacidus and Tureis (β and ι Carinae) and when the Full Moon was at Kitalpha and Alderamin (α Equulei and Cephei), it is the mechanical result of counting from the beginning of side a.

Another and better alternative should be to count backwards from the end of side b:

Gb7-22 (*24) Gb7-23 Gb7-24 Gb7-25 (436) Gb7-26
no star listed (24) no star listed (25) POLARIS, Baten Kaitos (26.6), Metallah (26.9) Segin, Mesarthim, ψ Phoenicis (27.2), SHERATAN, φ Phoenicis (27.4) ι Arietis (28.0), λ Arietis (28.2)
no star listed (207) τ Bootis (208.2), Benetnash (208.5), ν Centauri (208.7), μ Centauri, υ Bootis (208.8) no star listed (209) Muphrid (210.1), ζ Centauri (210.3) φ Centauri (211.0), υ¹ Centauri (211.1), υ² Centauri (211.8), τ Virginis (211.9)
April 14 15 16 17 18 (108)
October 14 15 (288) 16 17 18
'March 18 19 20 21 (80) 22
'September17 18 19 20 21 (264)
Gb7-27 (*29) Gb7-28 Gb7-29 (440)
Alrisha, χ Phoenicis (29.2), Alamak (29.7) 2h (30.4) η Arietis (31.9)
κ Arietis (30.3), Hamal (30.5)

Alkes

Agena (212.1), θ Apodis (212.5), Thuban (212.8) 14h (213.1) Asellus Tertius, κ VIRGINIS, 14 Bootis (214.8)
χ Centauri (213.0), Menkent (213.1)
April 19 20 21 (111)
October 19 20 (293) 21
'March 23 24 25 (84)
'September 22 23 (266) 24
Gb7-30 (441) Gb7-31 (*33) Gb8-1 Gb8-2
no star listed (32) θ Arietis (33.3), Mira (33.7) no star listed (34) ξ Arietis (35.0)
15 Bootis (215.2), ARCTURUS (215.4), Asellus Secundus (215.5), SYRMA, λ Bootis (215.6), η Apodis (215.8) ι Lupi, 18 Bootis (216.3), Khambalia (216.4), υ Virginis (216.5), ψ Centauri (216.6), ε Apodis (216.8) Asellus Primus (217.8) τ Lupi (218.1), φ Virginis (218.7)

Fomalhaut

April 22 (112) 23 24 25
October 22 (295) 23 24 25
'March 26 (85) 27 28 29 (454)
'September 25 (268) 26 27 28

Arcturus will then be at Gb7-30 and visible close to the Full Moon in April 22 (respectively in 'March 26 according to my assumed old calendar with 0h at Sheratan and Mesarthim).

On the other hand would Polaris and Baten Kaitos at the end of the Sea respectively Sheratan and Mesarthim at the beginning of the Land be invisible because they were close to the Sun.

Possibly on Easter Island the northern spring equinox meant the ruling stars shifted from heliacal to nakshatra. In autumn star observations would become easier.

Earlier I was much puzzled over why the sequence of stars from the beginning of side a contradicted the sequence of stars beginning (I assumed) with Rogo at 0h and Gb7-26.

But now there is no great problem: When a new sequence of ruling stars began, then the old sequence of stars would be at the Full Moon.

Another - although not independent - matter is what the glyphs were meant to depict. If the heliacal view should rule, then Gb7-30 ought to be at April 22 (where 112 = 16 weeks counted from January 1), when north of the equator spring had arrived.

In the times of Al Sharatain the day would have been 112 - 27 = 85 ('March 26) and this seems to be a more reasonable date for what we can see in Gb7-30.

G (nakshatra) 365 C (heliacal)
'March 26 (85) March 26 (85) 27 (452)
'September 25 (268) September 25 (268) 26
no star listed (32) 338 Ankaa, κ Phoenicis (5.0)

Alphard

λ Phoenicis (6.3), β Tucanae (6.4)
15 Bootis (215.2), ARCTURUS (215.4), Asellus Secundus (215.5), SYRMA, λ Bootis (215.6), η Apodis (215.8) γ Com. Berenicis (188.0), σ Centauri (188.1), Algorab (188.5), Gacrux (188.7) γ Muscae (189.0), Avis Satyra (189.3), Asterion (189.5), Kraz (189.7)

Day 452 (= March 27 + 366) corresponded to RA day 6, when in rongorongo times the Raven was close to the Full Moon.

Day 32 + 80 = 112 (April 22) had Arcturus close to the Full Moon.

From RA day 32 (April 22) to RA day 6 (March 27) there were 6 + 366 - 32 = 340 days.

The calendar distance was less than a year, viz. 340 nights:

G 338 C
'March 26 (85) 'February 27 (58) 28 (425)
15 Bootis (215.2), ARCTURUS (215.4), Asellus Secundus (215.5), SYRMA, λ Bootis (215.6), η Apodis (215.8) γ Com. Berenicis (188.0), σ Centauri (188.1), Algorab (188.5), Gacrux (188.7) γ Muscae (189.0), Avis Satyra (189.3), Asterion (189.5), Kraz (189.7)

March 26 (85) - 27 = 'February 27 (58) and 'February 28 (59) = 'February 28 (59 + 366 = 425).

338 + 27 = 365 = 392 - 27.