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The creator of the text could not be certain that his collage of signs in Ca2-1 would be enough to enable his reader to understand. In modern telecommunications there is always a risk the receiver will get a garbled message and the technique to overcome this obstacle is redundancy - to send more than one message so that it will be certain that at least one of them will be correctly received at the other end. So the creator of the glyph text had to do something similar, give the same message more than once.

The number of glyphs in line Ca1 is 26. This number was like number 8 loaded with meanings. For instance does it combine with 71 (the number of years for the precession to move the stars ahead in the year with one day). Anciently it was known that the precessional cycle was 26,000 years and I have used this number in order to find 71 as the number of years to work with in presenting 'the First Point in Aries' as it was back in time.

26,000 / 365¼ = ca 71

26 glyphs in line Ca1 could therefore be a cue for the reader that the text was to be placed in the cosmological category. 26 could be 'read' as short for 26,000 years and the beginning of side a could be similar to the 'very beginning of time'.

However, this is surely no proof of my proposed interpretation. It takes much more. The number of glyphs on side b of the tablet is 348 and its last line Cb14 has 19 glyphs.

a1 26 26 b1 24 24 416
a2 25 51 b2 25 49 441
a3 25 76 b3 22 71 463
a4 29 105 b4 23 94 486
a5 35 140 b5 21 115 507
a6 28 168 b6 29 144 536
a7 31 199 b7 27 171 563
a8 29 228 b8 29 200 592
a9 27 255 b9 30 230 622
a10 29 284 b10 22 252 644
a11 32 316 b11 22 274 666
a12 27 343 b12 25 299 691
a13 20 363 b13 30 329 721
a14 29 392 b14 19 348 740
sum 392 sum 348  

I have discovered that these 19 glyphs probably should be subdivided into 11 + 8. The total number of glyphs on the tablet is 740 and this equals 2 * 366 + 8.

The solar calendar year used by the rongorongo writers was not 365 days - which would have been wrong because the true year is approximately 365¼ days. Instead they probably used a calendar with 366 days ('nights').

There are 8 ('octopus') glyphs which are exposed to the reader as a Sign at the end of side b:

March 21 (81)   22 23
Septembe 20 21 (264) equinox
Cb14-11 (732) Cb14-12 Cb14-13
ku kikiu tagata kua to i te heke
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)
March 24 25 (85)   26
September 23 24 25 (268)
Cb14-14 Cb14-15 (736) Cb14-16
tagata tui i tona ika manu puoko erua  te manu - e noi koe te manu
ζ Tucanae (3.5), π Tucanae (3.7) no star listed Ankaa, κ Phoenicis (5.0)
Chang Sha (186.3) Intrometida (187.4), Acrux (187.5) γ Com. Berenicis (188.0), σ Centauri (188.1), Algorab (188.5), Gacrux (188.7)
March 27 28 (88) 29
September 26 27 28 (271)
Cb14-17 Cb14-18 Cb14-19 (740)
kokoti hia te henua - tagata hakaitiiti - i te henua
λ Phoenicis (6.3), β Tucanae (6.4) no star listed DELTA (8.4), Schedir (8.6), μ Phoenicis (8.9)
 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) Al Áwwā'-11
ρ Virginis (191.4), PORRIMA, γ Centauri (191.5)

After 2 * 366 = 732 glyphs (days) the text returns to its beginning at the March equinox.

This time, however, March 21 is represented by a glyph (Cb14-11) and I have assigned its day number as 81 instead of 80 because the month corresponding to our February (if there was such a month) carried not 28 but 29 days (like in one of our leap years).