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On side a of the G tablet the star positions were evidently updated to the time of rongorongo (ca 1842 AD). The creator of the text had kept his precessional clock running and it was possible to correlate the heliacal stars with the dates in the Gregorian calendar.

On side b of the tablet the glyphs seem to describe the positions of the nakshatra stars 27 precessional days earlier, in Roman times. We can compare hakaturou in Gb1-18 (where 118 = 4 * 29½) with hakaturou in Ga2-11:

38 APRIL 29 30 MAY 1 (*41) 2 (122) 200
Ga2-9 Ga2-10 (40) Ga2-11 Ga2-12
Mash-mashu-sha-Risū-9 (Twins of the Shepherd ?)

θ Gemini (103.0), ψ8 Aurigae (103.2), ALHENA = γ Gemini (103.8), ψ9 Aurigae (103.9)

ADARA (Virgin) = ε Canis Majoris (104.8) ω Gemini (105.4), ALZIRR = ξ Gemini (105.7), MULIPHEIN = γ Canis Majoris (105.8), MEKBUDA = ζ Gemini (105.9) 7h (106.5)

no star listed (106)

July 2 (*104 = 8 * 13) 4 (185) 5
ºJune 28 29 (*100) SIRIUS ºJuly 1 (182)
NAKSHATRA DATES:
OCTOBER 29 30 (303) 31 (*224) NOVEMBER 1
χ Oct. (286.0), AIN AL RAMI = ν Sagittarii (286.2), υ Draconis (286.4), δ Lyrae (286.3), κ Pavonis (286.5), ALYA = θ Serpentis (286.6) ξ Sagittarii (287.1), ω Pavonis (287.3), ε Aquilae, ε Cor. Austr., SULAPHAT = γ Lyrae (287.4), λ Lyrae (287.7), ASCELLA = ζ Sagittarii, BERED = i Aquilae (Ant.) (287.9)  Al Na'ām-18 / Uttara Ashadha-21

NUNKI = σ Sagittarii (288.4), ζ Cor. Austr. (288.5), MANUBRIUM = ο Sagittarii (288.8), ζ Aquilae (288.9)

19h (289.2)

λ Aquilae (Ant.) (289.1), γ Cor. Austr (289.3), τ Sagittarii (289.4), ι Lyrae (289.5), δ Cor. Austr. (289.8)

January 1 2 3 (368) 4
°December 28 29 30 (364) 31
242
NOVEMBER 19 20 (324) 21 22 23 24 (*248) 179
Gb1-14 Gb1-15 Gb1-16 Gb1-17 Gb1-18 Gb1-19 (248)
GREDI = α Capricorni (307.2), σ Capricorni (307.5), ALSHAT = ν Capricorni (307.9) Al Sa’d al Dhabih-20 / Ox / Herd Boy-9

DABIH = β Capricorni (308.0), κ Sagittarii (308.1), SADIR = γ Cygni (308.4), PEACOCK = α Pavonis (308.7)

MINTAKA (δ Orionis) ALNILAM (ε Orionis) ALNILAK (ζ Orionis) ROTANEV = β Delphini, ι Delphini (312.3), τ Capricorni (312.6), κ Delphini (312.7), SVALOCIN = α Delphini, υ Capricorni, υ Pavonis (312.8)
OKUL = π Capricorni (309.6), BOS = ρ Capricorni (309.9)

ARNEB (α Leporis)

ο Capricorni (310.2), θ Cephei (310.5)

HEKA (λ Orionis)

ROTTEN MELON = ε Delphini, φ Pavonis (311.2), η Delphini (311.4), ζ Delphini, ρ Pavonis (311.7)

PHAKT (α Columbae)

'December 26 27 28 29 30 (364) 31 (*285)
NAKSHATRA DATES:
MAY 20 (*60) 21 22 23 24 (*64) 25
AL TARF (End) = β Cancri (124.3)

RAS ALGETHI (α Herculis)

χ Cancri (125.2), BRIGHT FIRE = λ Cancri (125.4) AVIOR = ε Carinae (126.4), φ Cancri (126.8) ο Ursa Majoris (127.4)  Pushya-8

υ Cancri (128.1), θ CANCRI (128.2)

Āshleshā-9 / Willow-24

π¹ Ursa Majoris, δ HYDRAE (129.6), AL MINHAR AL SHUJĀ = σ Hydrae, MUSEIDA = π² Ursae Majoris (129.9)

RAS ALHAGUE (α Ophiuchi)

'June 26 (177) 27 28 29 (*100) SIRIUS 'July 1
Ga3-1 Ga3-2 (61) Ga3-3 Ga3-4 Ga3-5 Ga3-6
184
MAY 23 (*428 = 2 * 214) 24 (*64) 25 (145) 26 (2 * 73) 40 1
Gb7-18 (428) Gb7-19 (200) Gb7-20 (136 + 5 * 13) Gb7-21
(63 = 428 - 365) Ga3-5 Ga3-6 Ga3-7
ο Ursa Majoris (127.4) Pushya-8

υ Cancri (128.1), θ CANCRI (128.2)

Āshleshā-9 / Willow-24

π¹ Ursa Majoris, δ Hydrae (129.6), AL MINHAR AL SHUJĀ = σ Hydrae, MUSEIDA = π² Ursae Majoris (129.9)

RAS ALHAGUE (α Ophiuchi)

Al Nathrah-6

BEEHIVE = ε Cancri, η Pyxidis (130.4), XESTUS = ο Velorum (130.5), ζ Pyxidis (130.7), ASCELLUS BOREALIS = γ Cancri, β Pyxidis (130.9)

July 26 27 (*128 = *64 * 2) 28 (145 + 64) 29 (210 = 7 * 30)
ºJuly 22 (π) 23 24 25
NAKSHATRA DATES:
NOVEMBER 21 (325) 22 (144 + 182) 23 (*65 + 182) (*248 = *431 - 183)
MINTAKA (δ Orionis) ALNILAM (ε Orionis) ALNILAK (ζ Orionis) ROTANEV = β Delphini, ι Delphini (312.3), τ Capricorni (312.6), κ Delphini (312.7), SVALOCIN = α Delphini, υ Capricorni, υ Pavonis (312.8)
OKUL = π Capricorni (309.6), BOS = ρ Capricorni (309.9)

ARNEB (α Leporis)

ο Capricorni (310.2), θ Cephei (310.5)

HEKA (λ Orionis)

ROTTEN MELON = ε Delphini, φ Pavonis (311.2), η Delphini (311.4), ζ Delphini, ρ Pavonis (311.7)

PHAKT (α Columbae)

January 24 25 26 27 (392)
45

... 242 + 1 + 184 + 45 = 472 = 16 * 29½. Anciently hakaturou in Ga2-11 was at MAY 1 (121 = 11 * 11) but due to the precession this date had moved to ºJune 30 (181), and the difference (60 precessional days) was probably reflected in the distance from ºJanuary 1 up to and including ºMarch 1:

DECEMBER 31 (0) 120 MAY 1 (121)
 ºMarch 1 (60) 120 ºJune 30 (181)

The precession had moved the date for heliacal Sirius to a position which corresponded to the ideas connected with this wonderful star, viz. to the last day of the first half of the year - to the day preceding the first day of the 2nd half of the year:

... The Sothic cycle was based on what is referred to in technical jargon as 'the periodic return of the heliacal rising of Sirius', which is the first appearance of this star after a seasonal absence, rising at dawn just ahead of the sun in the eastern portion of the sky. In the case of Sirius the interval between one such rising and the next amounts to exactly 365.25 days - a mathematically harmonious figure, uncomplicated by further decimal points, which is just twelve minutes longer than the duration of the solar year ...

And at the time of Gregory XIII the star at the Full Moon 'happened to be' Nunki:

... Close to the Full Moon were Ascella and Nunki in Sagittarius, which meant that when Sirius was at the Sun then the Full Moon would had been where the Sea was said to begin. At the time of Gregory XIII this was in day 364 counted from °January 1. Land was beginning in °June 30 and its opposite, Sea, was originating in °December 31. 'Land' ('summer') began at the opposite side of the sky compared to the beginning of the 'Sea' ('winter') ...

... This [σ] has been identified with Nunki of the Euphratean Tablet of the Thirty Stars, the Star of the Proclamation of the Sea, this Sea being the quarter occupied by Aquarius, Capricornus, Delphinus, Pisces, and Pisces Australis. It is the same space in the sky that Aratos designated as Water ...

Anciently hakaturou in Gb1-18 was at NOVEMBER 23 (327) - or better, at MAY 24 (144) when looking nakshatra wise at the face of the Full Moon. 327 + 183 - 366 = 144 (= 12 * 12). And at the time when Sheratan rose with the Sun, 27 precessional days earlier than at my assumed time for rongorongo, this day had shifted ahead in the calendar to a position which was 64 - 27 = 37 days later, viz. to 'June 30 (181) - when Sirius would have risen with the Sun ...

Above I have allowed the sequences of helical stars to continue uninterruped, but somewhere there should be a break, because clearly Polaris and Sheratan were indicated 324 days after Aldebaran. FEBRUARY 12 (408) - 84 (MARCH 25) = 408 - 84 = 435 (Gb7-25) - Ga1-4 (4) - 107 = 324.

FEBRUARY 9 10 11 (42) 12 (408) 13 (*329)
Gb7-22 Gb7-23 (204) Gb7-24 Gb7-25 Gb7-26 (436)
ALSEIPH = φ Persei (24.5), τ Ceti (24.7) no star listed (25) ANA-NIA-10 (Pillar-to-fish by)

 χ Ceti (26.1), POLARIS = α Ursae Minoris, BATEN KAITOS = ζ Ceti (26.6), METALLAH = α Trianguli (26.9)

Al Sharatain-1 / Ashvini-1 / Bond-16 / Mahrū-sha-rishu-ku-1 (Front of the Head of Ku)

 SEGIN = ε Cassiopeia, MESARTHIM = γ Arietis, ψ Phoenicis (27.2), SHERATAN = β Arietis, φ Phoenicis (27.4)

ι Arietis (28.0), λ Arietis (28.2), υ Ceti (28.8)
4-14 (104) April 15 (*25) 16 (471) 17 (107) 18 (*393)
°April 10 (100) 11 (466) 12 13 14 (104)
NAKSHATRA DATES:
AUGUST 11 12 13 (*145) 14 15 (227)
no star listed (207) τ BOOTIS (208.2), BENETNASH = η Ursae Majoris (208.5), ν Centauri (208.7), μ Centauri, υ Bootis (208.8) no star listed (209) MUPHRID = η Bootis (210.1), ζ Centauri (210.3) φ Centauri (211.0), υ¹ Centauri (211.1), υ² Centauri (211.8), τ Virginis (211.9)
October 14 15 16 17 (290) 18
°October 10 11 (*204) 12 (285) 13 14
38 MARCH 24 25 (84) 26 (*5) 27
Ga1-3 Ga1-4 Ga1-5 Ga1-6
no star listed (67) Rohini-4 / Pidnu-sha-Shame-4 (Furrow of Heaven) / ANA-MURI-2 (Rear pillar - at the foot of which was the place for tattooing)

ALDEBARAN = α Tauri (68.2), THEEMIN = υ² Eridani (68.5)

no star listed (69) no star listed (70)
May 27 28 (148) 29 30 (*70)
°May 23 24 (144) 25 (*65) 26
NAKSHATRA DATES:
SEPTEMBER 23 24 (*187) 25 (268) 26
γ Apodis (250.1), σ Herculis (250.3), θ Tr. Austr. (250.6), τ Scorpii (250.7) HAN = ζ Ophiuchi (251.0) ζ Herculis, η Tr. Austr. (252.1), η Herculis, β Apodis (252.5) ATRIA = α Tr. Austr. (253.9)
November 26 (*250) 27 28 29 (333)
°November 22 23 24 (*248) 25 (329)

Should we draw back the star positions with 4 precessional days - in order to reach their positions in the calendar at the time of Gregory XIII - then heliacal Aldebaran would be at *64 and this would put the Aldebaran vaha mea opening at °May 24 (144 = 80 + 64 = 12 * 12). Given the Gregorian calendar was behind the structure on side a of the tablet the position of Antares would then change from Ga1-4 to Ga1-0:

0h MARCH 22 (*1) 23 (82)
no glyph
Ga1-1 Ga1-2
HYADUM II = δ¹ Tauri (64.2) Net-19

AIN (Eye) = ε Tauri, θ¹ Tauri, θ² Tauri (65.7)

no star listed (66)
May 24 25 (145) 26 (*66)
°May 20 21 (*61) 22 (142)
NAKSHATRA DATES:
SEPTEMBER 20 (*183) 21 (264) EQUINOX
Heart-5

σ SCORPII (247.0), HEJIAN = γ Herculis (247.2), ψ Ophiuchi (247.7)

ρ Ophiuchi (248.1), KAJAM = ω Herculis (248.3), χ Ophiuchi (248.5), SHE LOW (Market Tower) = υ Ophiuchi, Tr. Austr. (248.7), ζ Tr. Austr. (248.8) Al Kalb-16 / Jyeshtha-18 / ANA-MUA-1 (Entrance pillar)

ANTARES = α Scorpii (249.1), MARFIK = λ Ophiuchi, φ Ophiuchi (249.5),  ω Ophiuchi (249.8)

November 23 (327) 24 25 (*249)
°November 19 20 (*244) 21 (325)

And the vaha mea at Sheratan would move to Gb7-21, to the ancient FEBRUARY 8.

... On February 9 the Chorti Ah K'in, 'diviners', begin the agricultural year. Both the 260-day cycle and the solar year are used in setting dates for religious and agricultural ceremonies, especially when those rituals fall at the same time in both calendars. The ceremony begins when the diviners go to a sacred spring where they choose five stones with the proper shape and color. These stones will mark the five positions of the sacred cosmogram created by the ritual.

When the stones are brought back to the ceremonial house, two diviners start the ritual by placing the stones on a table in a careful pattern that reproduces the schematic of the universe. At the same time, helpers under the table replace last year's diagram with the new one. They believe that by placing the cosmic diagram under the base of God at the center of the world they demonstrate that God dominates the universe.

The priests place the stones in a very particular order. First the stone that corresponds to the sun in the eastern, sunrise position of summer solstice is set down; then the stone corresponding to the western, sunset position of the same solstice. This is followed by stones representing the western, sunset position of the winter solstice, then its eastern, sunrise position. Together these four stones form a square. They sit at the four corners of the square just as we saw in the Creation story from the Classic period and in the Popol Vuh. Finally, the center stone is placed to form the ancient five-point sign modern researchers called the quincunx ...