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We can read the beginning of side a on the C tablet nakshatra wise, with Raven close to the Full Moon at the time when the Sun reached Algenib Pegasi - which in Roman times would have been at the end of their regular year, at Terminalia:

September 20 (*183) 21 (264) Equinox
'August 24 (236) 25 (*157 = *314 / 2) 26
ALCHITA = α Corvi, MA WEI (Tail of the Horse) = δ Centauri (183.1), MINKAR (Nose) = ε Corvi (183.7), ρ Centauri (183.9) PÁLIDA = δ Crucis (184.6), MEGREZ = δ Ursae Majoris (184.9) Hasta-13 / Chariot-28 

GIENAH (Wing) = γ Corvi (185.1), ε Muscae (185.2), ζ Crucis (185.4), ZANIAH = η Virginis (185.9)

no glyph
Ca1-1 Ca1-2
koia ki te hoea
Al Fargh al Thāni (Rear Spout) -25

0h (365.25)

CAPH = β Cassiopeiae, SIRRAH = α Andromedae (0.5), ε Phoenicis, γ³ Oct. (0.8)
Uttara Bhādrapadā-27 / Wall-14

ο Oct. (1.3), ALGENIB PEGASI = γ Pegasi (1.8)

χ Pegasi (2.1), θ Andromedae (2.7)
March 21 (0h) 22 (81) 23
'February 22 (53) Terminalia 24 (420 = 55 + 365)
September 23 (266) 24 (*187)
°September 19 (*183) 20 (264)
'August 27 28 (240)
CHANG SHA (Long Sand-bank) = ζ Corvi (186.3) INTROMETIDA = ε Crucis (187.4), ACRUX = α Crucis (187.5)
Ca1-3 Ca1-4
ki te henua te rima te hau tea
March 24 (83) Julian equinox
'February 25 26 (57)
σ Andromedae (3.0), ι Ceti (3.3), ζ Tucanae (3.5), ρ Andromedae, π Tucanae (3.7) no star listed (4)

... After the great flood had at long last receded, Raven had gorged himself on the delicacies left by the receding water, so for once, perhaps the first time in his life, he wasn't hungry. But his other appetites, his curiosity and the unquenchable itch to meddle and provoke things, to play tricks on the world and its creatures, these remained unsatisfied. Raven gazed up and down the beach. It was pretty, but lifeless. There was no one about to upset, or play tricks upon. Raven sighed. He crossed his wings behind him and strutted up and down the sand, his shiny head cocked, his sharp eyes and ears alert for any unusual sight or sound. The mountains and the sea, the sky now ablaze with the sun by day and the moon and stars he had placed there, it was all pretty, but lifeless. Finally Raven cried out to the empty sky with a loud exasperated cry. And before the echoes of his cry faded from the shore, he heard a muffled squeak. He looked up and down the beach for its source and saw nothing. He strutted back and and forth, once, twice, three times and still saw nothing. Then he spied a flash of white in the sand. There, half buried in the sand was a giant clamshell. As his shadow fell upon it, he heard another muffled squeak. Peering down into the opening between the halves of the shell, he saw it was full of tiny creatures, cowering in fear at his shadow. Raven was delighted. Here was a break in the monotony of the day. But how was he to get the creatures to come out of their shell and play with him? Nothing would happen as long as they stayed inside the giant clamshell ...

My idea is that the creator of the text looked at the positions of the stars close to the Full Moon and from there perceived how the Julian date for the (northern) spring equinox - March 25 (84) - had been coinciding with heliacal Acrux.

... Take the lower part of a gourd or hula drum, rounded as a wheel (globe), on which several lines are to be marked and burned in, as described hereafter. These lines are called na alanui o na hoku hookele, the highways of the navigation stars, which stars are also called na hoku ai-aina, the stars which rule the land. Stars lying outside these three lines are called na hoku a ka lewa, foreign, strange, or outside stars. The first line is drawn from Hoku-paa, the fixed or North Star, to the most southerly star of Newe, the Southern Cross ...

At the time of Gregory XIII Acrux would have been close to the Full Moon in °March 21 (0h), and the precession since then had carried Acrux forward with 4 days in his calendar. Therefore, at the time of rongorongo the Sun would have reached Acrux in day 183 + 4 = 187 counted from 0h, viz. in September 24. Whereas in Roman times, 27 precessional days earlier, Acrux would have risen with the Sun in 'August 28, which was day 240 - 80 = 160 (= 320 / 2) counted from 0h.

... When the Pope rearranged the day for spring equinox from number 84 ('March 25) to number 80 (ºMarch 21) the earlier Julian structure was buried, was covered up (puo). At the same time the Pope deliberately avoided to correct the flow of Julian calendar days for what he may have regarded as 4 unneccesary leap days prior to the Council of Nicaea. Thus his balance sheet for days was in order. The day numbers counted from the equinox were increased with 4 and this was equal to allowing the 4 'unneccessary' leap days to remain in place. But he had moved spring equinox to a position which was 4 days too early compared to the ancient model. And he had also broken the Julian connection between the Sun year and the Sirius year. The Julian year was precisely as long as the Sirius year, but the new Gregorian year was slightly shorter - due to fewer leap days - and no longer was Sirius going to stand still in the calendar, no longer would Sirius be a marvellous star; only the brightest, which however was no mystery because there had to be some star which was brightest ...

... the Gregorian 'canoe' was 'crooked'. His calendar was not in perfect alignment with the ancient star structure ...

The change with 4 days from day 84 (Julian equinox) to day 80 (Gregorian equinox) had to be considered when looking at the stars. Furthermore, the proper place for heliacal Acrux (and the other fixed stars) should have come 4 days later, not in September 24 but in September 28, where Porrima now had been put. However, at the time of rongorongo the precession had healed the wound, with Acrux once again ascending together with the Sun in September 24, followed by Porrima in September 28. The canoe was no longer crooked:

... They go inland at the land. The child nursed and tended grows up, is able to go and play. Each day he now goes off a bit further away, moving some distance away from the house, and then returns to their house. So it goes on and the child is fully grown and goes to play far away from the place where they live. He goes over to where some work is being done by a father and son. Likāvaka is the name of the father - a canoe-builder, while his son is Kiukava. Taetagaloa goes right over there and steps forward to the stern of the canoe saying - his words are these: 'The canoe is crooked.' (kalo ki ama). Instantly Likāvaka is enraged at the words of the child. Likāvaka says: 'Who the hell are you to come and tell me that the canoe is crooked?' Taetagaloa replies: 'Come and stand over here and see that the canoe is crooked.' Likāvaka goes over and stands right at the place Taetagaloa told him to at the stern of the canoe. Looking forward, Taetagaloa is right, the canoe is crooked. He slices through all the lashings of the canoe to straighten the timbers. He realigns the timbers. First he must again position the supports, then place the timbers correctly in them, but Kuikava the son of Likāvaka goes over and stands upon one support. His father Likāvaka rushes right over and strikes his son Kuikava with his adze. Thus Kuikava dies. Taetagaloa goes over at once and brings the son of Likāvaka, Kuikava, back to life. Then he again aligns the supports correctly and helps Likāvaka in building the canoe. Working working it is finished  ...

September 25 (*188) 26 27 (270) 28
°September 21 (264) Equinox 23 24 (*187)
'August 29 (*161) 30 (242) 31 'September 1
γ Com. Berenicis (188.0), σ Centauri (188.1), ALGORAB = δ Corvi (188.5), GACRUX = γ Crucis (188.7) γ Muscae (189.0), AVIS SATYRA = η Corvi (189.3), ASTERION = β Canum Ven. (189.5), KRAZ = β Corvi, κ Draconis (189.7) α MUSCAE (190.2), τ Centauri (190.5), χ Virginis (190.7)

ALDERAMIN (α Cephei)

Al Áwwā'-11

Sombrero Galaxy = M104 Virginis (191.1), ρ Virginis (191.4), PORRIMA = γ Virginis, γ Centauri (191.5)

Ca1-5 Ca1-6 Ca1-7 Ca1-8
haga i te mea ke ki te henua - tagata honui te ika te honu
March 26 27 28 29 (88)
°March 22 23 24 25 (84)
'February 27 (58) 28 (424) 'March 1 (*345) 2
ANKAA = α Phoenicis, κ Phoenicis (5.0)

ALPHARD (α Hydrae)

λ Phoenicis (6.3), β Tucanae (6.4) ANDROMEDA GALAXY (M31), π Andromedae (7.7) ε Andromedae (8.2), DELTA = δ Andromedae (8.4), SCHEDIR = α Cassiopeiae (8.6), ζ Andromedae, μ Phoenicis (8.9)

The Pope had covered up the ancient line of observation from Delta in Andromeda to Porrima in Virgo, but at the time of rongorongo it had come alive again:

The Babylonians had Porrima at the end of their path and the Arabs had kept Delta as their leading star:

11 Mash-mashu-arkū Eastern One of the Twins β (Pollux) Gemini 116.2 July 15 (196)
12 Arkū-sha-nangaru-sha-shūtu Southeast Star in the Crab δ (Ascellus Australis) Cancri 131.4 July 30 (211)
13 Rishu A. Head of the Lion ε (Ras Elaset Australis) Leonis 146.6 Aug 14 (226)
14 Sharru King α (Regulus) Leonis 152.7 Aug 20 (232)
15 Maru-sha-arkat-Sharru 4th Son behind the King ρ (Shir) Leonis 158.9 Aug 26 (238)
16 Zibbat A. Tail of the Lion β (Denebola) Leonis 178.3 Sept 15 (258)
17 Shēpu-arkū sha-A Hind Leg of the Lion β (Alaraph) Virginis 178.6 Sept 15 (258)
18 Shur-mahrū-shirū Front or West Shur (?) γ (Porrima) Virginis 191.5 Sept 28 (271)
 
19 Sa-Sha-Shirū Virgin's Girdle α (Spica) Virginis 202.7 Oct 9 (282)
    Delta δ Andromedae 8.4 March 29 (88)
1 Al Sharatain Pair of Signs β Arietis (Sheratan), γ (Mesarthim) 27.4 April 17 (107)
2 Al Dabarān Follower α Tauri (Aldebaran), θ¹, θ²´, γ (Hyadum I), δ (Hyadum II), ε (Ain) 63.4 May 23 (143)
3 Al Hak'ah White Spot λ Orionis (Heka), φ¹, φ² 83.4 June 12 (163)
4 Al Han'ah Brand γ Gemini (Alhena), μ (Tejat Posterior), ν, η (Tejat Prior), ξ (Alzirr) 93.4 June 22 (173)
5 Al Dhirā' Forearm α Gemini (Castor), β (Pollux) 113.4 July 12 (193)
6 Al Nathrah Gap ε Cancri (Beehive) 130.4 July 29 (210)
7 Al Tarf End ξ Cancri, λ Leonis (Alterf) 143.4 Aug 11 (223)
8 Al Jabhah Forehead η Leonis (Al Jabhah), α (Regulus), ζ (Adhafera), γ (Algieba) 152.4 Aug 20 (232)
9 Al Zubrah Mane δ Leonis (Zosma), θ (Coxa) 169.4 Sept 6 (249)
10 Al Sarfah Turn β Leonis (Denebola) 178.3 Sept 15 (258)
11 Al Áwwā' Barker β (Alaraph), η (Zaniah), γ (Porrima), δ (Minelauva), ε Virginis (Vindemiatrix) 191.5 Sept 28 (271 = 88 + 183)