There is only one place in the rongorongo texts where Metoro used the word tapu. This was at Cb2-21 where the manzil Pleione was beginning. Judging from the rules on Hawaii we can guess May 31 was said to be tapu because it was the first of 5 tapu nights leading up to the heliacal rising of Rigel:
Azzubra 13 (144) at Ca8-1 is 128 nights later than Pleione 2 (= June 1):
The fact that the Sheratan manzil has 14 nights instead of the normal 13 points at the possibility that the date Sheratan 14 was special, maybe in order to put Pleione 1 at its proper place. Sheratan 14 corresponds to May 30 which is day 150 counted from January 1. The manu bird in Cb2-20 is looking back, possibly over 150 days:
Wei (the Tail) in the nakshatra night is ε Scorpii, a star which rose heliacally 254.3 + 80 - 354 = 20 days before the December solstice. May 30 (150) + 184 = November 30 (334). Beyond the heliacal day of Aldebaran and Theemin there are 5 days without any of my listed stars rising together with the Sun. From May 31 to the June solstice there are 172 - 151 = 3 weeks. The moe tapu bird in Cb2-21 ought to refer not to the previous season but ahead. Possibly it means there were 150 preceding days without the normal lunar calendar pattern (with tapu nights at the beginning of Waxing and Waning Moon). 150 + 8 * 29½ = 386 = 13 * 29½ + 2½. Perhaps, therefore, the counting should begin not with January 1 but with January 3. 148 + 236 = 384. In other words, a normal Moon calendar order maybe returned with Pleione 1 (May 31). Or at least after the first 5 (rima) days of the Pleione manzil:
With a division of the year by 3 instead of 4 we cannot expect to find a reflection of e.g. Easter Island's May in its month number 5 + 6 = 11 (November). Instead, what can be expected is a reflection of e.g. Easter Island's June in its month number 6 + 4 = 10 (October), i.e. like a mirror image corresponding to how Waning Moon is the opposite of Waxing Moon. And the order in Hawaii north of the equator cannot be expected to be found as a simple reflection on Easter Island because the heliacal rising of Rigel in June 7 (158) was 22 days later than the heliacal rising of the Pleiades in May 16 (136). On Hawaii the autumnal reappearance of the Pleiades ('in the late eighteenth century') was 33 days earlier than the winter solstice. 354 - 33 = 321 (November 17). ... in the ceremonial course of the coming year, the king is symbolically transposed toward the Lono pole of Hawaiian divinity ... It need only be noticed that the renewal of kingship at the climax of the Makahiki coincides with the rebirth of nature. For in the ideal ritual calendar, the kali'i battle follows the autumnal appearance of the Pleiades, by thirty-three days - thus precisely, in the late eighteenth century, 21 December, the winter solstice. The king returns to power with the sun ... 321 (November 17) - 135 (May 15) = 186. But in rongorongo times the equation should have been 322 (November 18) - 135 (May 15) = 185. From the heliacal rising of Rigel in June 7 (158) to the reappearance of the Pleiades in the evening sky in November 18 (322) there ought to have been around 164 days. And because 364 - 164 = 200 there could have been ground for a mixed calendar with 2 * 200 = 400 nights, a calendar incorporating both the Rigel year and the Pleiades year. Antares rose heliacally in November 25 (329) = a week later than the reappearance in the evening of the Pleiades in November 18 (322). Aldebaran rose heliacally in May 28 (148) = 13 days later than the heliacal rising of the Pleiades in May 15 (135).
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