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no glyph
Ga1-1 Ga1-2
Hyadum II (δ¹ Tauri) (64.2) Net-19 no star listed (66)
AIN, θ¹ Tauri, θ² Tauri (65.7)
May 24 (5-24) 25 (*65 + 80 = 145) 26 (146 + 366 = 512)
ºMay 20 (5-20) 21 (*65 - 4 + 80 = 141) 22 (142 + 366 = 508)
'April 27 (4-27) 28 (*65 - 27 + 80 = 118) 29 (119 + 366 = 485)
"April 13 (4-13) 14 (*65 - 41 + 80 = 104) 15 (105 + 366 = 471)
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-MUA
σ SCORPII (247.0), Hejian (247.2), ψ Ophiuchi (247.7) ANTARES (249.1), Marfik, φ Ophiuchi (249.5),  ω Ophiuchi (249.8)
November 23 (*247) 24 (145 + 183 = 328) 25 (*249 + 80 = 329)
ºNovember 19 (*243) 20 (141 + 183 = 324) 21 (*245 + 80 = 325)
12 * 12 = 144 and 156 = 12 * 13 = 300 - 144. 12 * 14 = 168 and 300 + 168 = 468 = 12 * 39. 'October 27 (300) 28 (118 + 183 = 301) 29 (*222 + 80 = 302)
12 * 15 = 180 and 468 + 180 = 648 = 2 * 324 = 12 * 54 = 24 * 27 = 3 * 216 = 6 * 108. "October 13 (*206) 14 (104 + 183 = 287) 15 (*208 + 80 = 288)

The distance from the dates of my assumed heliacal calendar in rongorongo times to the dates in my from the C text perceived Al Sharatain lunar (nakshatra) calendar are 300 - 144 = 156 days (not 366 / 2 = 183 days), because precession had moved the Sun 27 (= 183 - 156) days earlier in the year (since the time around 71 * 27 = 1900 years previously when the heliacal and lunar calendars could have been made to 'walk hand in hand'). According to the heliacal calendar the stars had moved 27 days in the opposite direction (i.e. ahead), and therefore 300 + 27 - 144 = 183 (= 366 / 2).

However, the text could also allude to the time when 0h was at the star Bharani (41 Arietis), with Ga1-1 at "April 14 (which can be written 4-14 and counted as 414 = 9 * 46) - to be compared with 427 (4-27) = 4 * 61 and 413 (4-13) = 4 * 59. According to my reconstructions: in rongorongo times Bharani rose with the Sun 41.4 (cfr 414) days after 0h. Aldebaran came 27 days later,  41 + 27 = 68 days after March 21 (80), i.e. Aldebaran rose with the Sun in May 28 (148).

Moreover, from the first year of the Gregorian calendar (1582 A.D.) to 1842 A.D. (which I have used as a possible 'zero'-year for the rongorongo calendar texts) there are 260 years, and 260 / 71 = ca 3.66 days. Therefore, due to the precession, the stars in 1842 A.D. must have risen around 4 days later than in the time of Gregorius XIII. This could explain why the glyph for heliacal Aldebaran (Ana-muri) was placed not at the beginning of side a but 4 days later:

Ga1-3 Ga1-4 Ga1-5 Ga1-6
no star listed (67) Rohini-4 / ANA-MURI no star listed (69) no star listed (70)
ALDEBARAN (68.2), Theemin (68.5)
May 27 28 (*68 = *64 + 4) 29 30 (150)
ºMay 23 24 (*64) 25 26 (146)
'April 30 'May 1 (*41 = *64 - 23) 2 3 (123)
"April 16 (472) 17 (*27 = *64 - 37) 18 (108) 19
γ Apodis (250.1), σ Herculis (250.3), θ Tr. Austr. (250.6), τ Scorpii (250.7) Han (251.0) ζ Herculis, η Tr. Austr. (252.1), η Herculis, β Apodis (252.5) Atria (253.9)
November 26 (*250) 27 28 (332) 29
ºNovember 22 23 24 (328) 25 (*249)
'October 30 31 (*224) 'November 1 (305) 2
"October 16 17 (*210) 18 19 (292)

Counting at ºMay 26 (146 = 2 * 73 = 2 / 5 * 365):

5-26 could allude to 52 * 6 = 312 = 4 * 78 = 13 * 24.

*66 = 366 - 300.