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Once again I encountered the dilemma of both presenting texts and simultaneously discuss them. This is the current (it will probably change with time) beginning of my upgraded description of line Ga1:

no glyph
Ga1-1 Ga1-2
Hyadum II (γ Tauri) (64.2) Net-19 no star listed (66)
AIN, θ¹ Tauri, θ² Tauri (65.7)
May 24 (144) 25 (*65 + 80 = 145) 26 (146 + 366 = 512)
'April 27 28 (*65 - 27 + 80 = 118) 29 (119 + 366 = 485)
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 24 (301 + 27 = 328) 25 (*249 + 80 = 329)
'October 27 (300) 28 (301 + 366 = 667) 29 (*249 - 27 = *222)

12 * 12 = 144 and 156 = 12 * 13 = 300 - 144. 12 * 14 = 168 and 300 + 168 = 468 = 12 * 39. 12 * 15 = 180 and 468 + 180 = 648 = 2 * 324 = 12 * 54 = 24 * 27 = 3 * 216 = 6 * 108.

The distance from the dates of the heliacal calendar to the dates in the lunar calendar was 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 ago when the heliacal and lunar calendars were 'hand in hand'). From there the stars had according to the heliacal calendar moved 27 days ahead, i.e. 300 + 27 - 144 = 183 (= 366 / 2).

It became evident for me that I had to work more with the numbers, e.g. by noticing such equations as 468 = 12 * 39 = 6 * 78 = 3 * 156 = 472 - 4.

I think the basic structure in both the C and G texts is the right ascension grid, although not necessarily defined the way I have done it. I have used 365¼ days for the distribution of the stars around the heliacal cycle - the Julian year. But possibly the rongorongo masters used a grid with for instance 366 days. Or why not 460 / 2 = 366 - 136 = 230 nights?

The dates in the star calendar, defined from the time of Al Sharatain, may have been used not only in the C text but also in the G text. This is a reasonable assumption. Anyhow I need these dates in my presentations because otherwise it would hardly be possible to detect if the rongorongo carvers had used some other calendar.