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If a steadily updated path of the Sun calendar was used together with a stable calendar which began when Arcturus was close to the Full Moon, then with time these calendars would glide apart due to the precession.

In the times of Al Sharatain - 27 precessional days earlier than rongorongo times - the nothern spring equinox had been fixed to 'March 25 by Caesar:

G 338 C
April 21 (477) 22 (112) March 26 (85) 27 (452)
Oct 21 (660) 22 (295) Sept 25 (268) 26 (635)
η Arietis (31.9) no star listed (32) Ankaa, κ Phoenicis (5.0) λ Phoenicis (6.3), β Tucanae (6.4)
Asellus Tertius, κ VIRGINIS, 14 Bootis (214.8) 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)

Alphard

γ Muscae (189.0), Avis Satyra (189.3), Asterion (189.5), Kraz (189.7)
'March 25 (450) 26 (85) 'Febr 27 (58) 28 (425)
'Sept 24 (633) 25 (268) 'August 29 (607) 30 (242)
η Arietis (4.9) no star listed (370) Ankaa, κ Phoenicis (343.0) λ Phoenicis (344.3), β Tucanae (344.4)
Asellus Tertius, κ VIRGINIS, 14 Bootis (187.8) 15 Bootis (188.2), ARCTURUS (188.4), Asellus Secundus (188.5), SYRMA, λ Bootis (188.6), η Apodis (188.8) γ Com. Berenicis (161.0), σ Centauri (161.1), Algorab (161.5), Gacrux (161.7)

Alphard

γ Muscae (162.0), Avis Satyra (162.3), Asterion (162.5), Kraz (162.7)

A clear night sky with a Moon 'horn' in front (Gb7-29) probably meant we should read the G pair of glyphs nakshatra wise.

In contrast the C pair of glyphs may have been visualizing how the Sun had not yet reached the First Point of Aries. In line Gb7 the First Point of Aries had occurred 4 nights earlier but in the C text it would arrive 22 days later:

Gb7-24 Gb7-25 (*27) Gb7-26
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 (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 16 17 18 (108)
October 16 17 18
'March 20 21 (80) 22
'September 19 20 21 (264)

In the times of Al Sharatain the stars rose 27 days earlier in the year than in rongorongo times. For instance was Arcturus in RA day 268 ('September 25) - 80 = 188 = 215 - 27.

The beginning of the C text was, though, calibrated for rongorongo times, with its first glyph probably representing March 21. Below I have not bothered to put the stars and dates in parallel with the glyphs 1 position later, instead only copied one of my earlier presentations:

'February 22 (53) 23 (420) 24
March 21 22 (81) 23
September 20 21 equinox (265)
no glyph
Ca1-1 Ca1-2
koia ki te hoea
Al Fargh al Thāni-25 Uttara Bhādrapadā-27 / Wall-14 χ Pegasi (2.1), θ Andromedae (2.7)
0h (365.25)
Caph, SIRRAH (0.5), ε Phoenicis (0.8) ALGENIB PEGASI (1.8)
Alchita, Ma Wei (183.1), Minkar (183.7), ρ Centauri (183.9) Pálida (184.6), Megrez (184.9) Hasta-13 / Chariot-28
GIENAH (185.1), ε Muscae (185.2), ζ Crucis (185.4), Zaniah (185.9)
'February 25 (56) 26
March 24 25 (84)
September 23 24
Ca1-3 Ca1-4
ki te henua te rima te hau tea
ζ Tucanae (3.5), π Tucanae (3.7) no star listed (4)
Chang Sha (186.3) Intrometida (187.4), Acrux (187.5)
'February 27 28 (59) 'March 1 (426) 2
March 26 27 28 29 (88)
September 25 (268) 26 27 28
Ca1-5 Ca1-6 Ca1-7 Ca1-8
haga i te mea ke ki te henua - tagata honui te ika te honu
Ankaa, κ Phoenicis (5.0)

Alphard

λ Phoenicis (6.3), β Tucanae (6.4) no star listed (7) Delta (8.4), Schedir (8.6), μ Phoenicis (8.9)
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)  α Muscae (190.2), τ Centauri (190.5), χ Virginis (190.7)

Alderamin

Al Áwwā'-11
ρ Virginis (191.4), PORRIMA, γ Centauri (191.5)