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If the C text was beginning - as I have suggested - at the September equinox, then an accumulation of important stars could be expected to be present also here, because I have assumed that the star watchers on Easter Island would have observed Sirrah close to the Full Moon as a sign of the southern spring equinox.

Sirrah culminated at midnight in the day when the Sun reached Gemma in Corona Borealis, which in Roman times was in day 288 (= 24 * 12):

*MARCH 4 (90 - 68 + 41) 5 (64)
Gb4-32 (123) Gb4-33 (353)
σ Persei (51.6) no star listed (52)
"March 31 (90) "April 1 (*11)
NAKSHATRA DATES:
*SEPTEMBER 3 (246 = 273 - 27) 4 (*167 = *235 - *68)
NUSAKAN (Pauper) = β Cor. Bor. (234.0), κı Apodis (234.3), ν Bootis (234.7), ζ Librae (234.9) θ Cor. Borealis (235.3), γ Lupi (235.6), GEMMA = α Cor. Bor., ZUBEN ELAKRAB = γ Librae, QIN = δ Serpentis, ε Tr. Austr. (235.7), μ Cor. Borealis (235.8), υ Librae (235.9)

SIRRAH (α Andromedae)

"September 30 (273) "October 1
Ga6-29 Ga7-1 (170)
HELIACAL DATES:
*MARCH 5 6 (65 = 365 - 300) 7 8 (68 = 136 - 68) 10 (*354)
  ACRUX   Al Thurayya-27 / Krittikā-3 PORRIMA
TAU-ONO (Six Stones) TEMENNU (Foundation Stone)
May 12 13 14 (*54) 15 (500) 16 (136) 17
'April 15 (472 - 366 = 366 - 260) 17 (*27) 18 19 20
NAKSHATRA DATES:
*SEPTEMBER 4 5 (248) 6 7 8 9 (*172)
GEMMA

SIRRAH

   COR SERPENTIS UNUK ELHAIA    
November 11 12 (*236) 13 14 15 16 (320)
'October 15 (288) 16 17 (*210) 18 19 20

At the time of rongorongo Sirrah was at the Full Moon in night number 80 (0h) + 183 = 263 (September 20) which was 52 nights earlier than its midnight culmination in November 11 (315). 183 + 52 = 235 = 315 - 80:

September 20 (*183) 21 (264 = 364 - 100) Equinox
'August 24 (236 = 8 * 29½) 25 (*157 = *314 / 2) 26
ALCHITA = α Corvi, MA WEI (Tail of the Horse) = δ Centauri (183.1), MINKAR (Nose) = ε Corvi (183.7), ρ Centauri (183.9) PÁLIDA (Pale) = δ Crucis (184.6), MEGREZ (Root of the Tail) = δ Ursae Majoris (184.9) Hasta-13 / Chariot-28 (Worm)

GIENAH (Wing) = γ Corvi (185.1), ε Muscae (185.2), ζ Crucis (185.4), ZANIAH (Corner) = η Virginis (185.9)

no glyph
Ca1-1 Ca1-2
koia ki te hoea
Al Fargh al Thāni (Rear Spout)-25

0h (365.25)

CAPH = β Cassiopeiae, SIRRAH = α Andromedae (0.5), ε Phoenicis, γ³ Oct. (0.8)
Uttara Bhādrapadā-27 / Wall-14 (Porcupine)

ο Oct. (1.3), ALGENIB PEGASI = γ Pegasi (1.8)

χ Pegasi (2.1), θ Andromedae (2.7)
March 21 (0h) 22 (81) 23
'February 22 (53) Terminalia 24
September 23 (266) 24 (*187 = *183 + 4)
'August 27 (239) 28 (*160)
CHANG SHA (Long Sand-bank) = ζ Corvi (186.3) INTROMETIDA = ε Crucis (187.4), ACRUX = α Crucis (187.5)
Ca1-3 Ca1-4
ki te henua te rima te hau tea
March 24 Julian equinox (84)
°March 20 21 (80, 0h)
'February 25 26 (57)
σ Andromedae (3.0), ι Ceti (3.3), ζ Tucanae (3.5), ρ Andromedae, π Tucanae (3.7) no star listed (4)
September 25 (*188) 26 27 (270) 28 355
'August 29 (*161) 30 (242) 31 'September 1
γ Com. Berenicis (188.0), σ Centauri (188.1), ALGORAB = δ Corvi (188.5), GACRUX = γ Crucis (188.7) γ Muscae (189.0), AVIS SATYRA = η Corvi (189.3), ASTERION = β Canum Ven. (189.5), KRAZ = β Corvi, κ Draconis (189.7) α Muscae (190.2), τ Centauri (190.5), χ Virginis (190.7)

ALDERAMIN (α Cephei)

Al Áwwā'-11

Sombrero Galaxy M104 Virginis (191.1), ρ Virginis (191.4), PORRIMA = γ Virginis, γ Centauri (191.5)

Ca1-5 Ca1-6 Ca1-7 Ca1-8 (4 + 4)
haga i te mea ke ki te henua - tagata honui te ika te honu
March 26 27 28 29 (88)
'February 27 (58) 28 'March 1 (*346) 2
ANKAA = α Phoenicis, κ Phoenicis (5.0)

ALPHARD (α Hydrae)

λ Phoenicis (6.3), β Tucanae (6.4) Andromeda Galaxy (M31), π Andromedae (7.7) ε Andromedae (8.2), DELTA = δ Andromedae (8.4), SCHEDIR (Breast) = α Cassiopeiae (8.6), ζ Andromedae, μ Phoenicis (8.9)
September 18 (9 * 29) 19 20 (263) 21 Equinox
'August 22 23 (235 = 262 - 27) 24 (8 * 29½) 25 (*157) 26
π Virginis (181.0), θ Crucis (181.5) 12h (182.6)

ο Virginis (182.1), η Crucis (182.5)

ALCHITA = α Corvi, MA WEI (Tail of the Horse) = δ Centauri (183.1), MINKAR (Nose) = ε Corvi (183.7), ρ Centauri (183.9) PÁLIDA (Pale) = δ Crucis (184.6), MEGREZ (Root of the Tail) = δ Ursae Majoris (184.9) Hasta-13 / Chariot-28 (Worm)

GIENAH (Wing) = γ Corvi (185.1), ε Muscae (185.2), ζ Crucis (185.4), ZANIAH (Corner) = η Virginis (185.9)

*Ca14-1 (4 + 360) *Ca14-2 *Ca14-3 *Ca14-4 *Ca14-5 (368 = 2 + 366)
Kua tupu te ata i te henua
March 19 (78) 20 21 (0h) 22 23 (*368 = *2 + *366)
'February 20 21 22 (53) Terminalia 24 (*341 = *368 - *27)
η Tucanae (363.0), ψ Pegasi (363.1), 32 Piscium (363.2), π Phoenicis (363.4), ε Tucanae (363.6), τ Phoenicis (363.9) θ Oct. (364.4) Al Fargh al Thāni (Rear Spout)-25

0h (365.25)

CAPH = β Cassiopeiae, SIRRAH = α Andromedae (0.5), ε Phoenicis, γ³ Oct. (0.8)
Uttara Bhādrapadā-27 / Wall-14 (Porcupine)

ο Oct. (1.3), ALGENIB PEGASI = γ Pegasi (1.8)

χ Pegasi (2.1), θ Andromedae (2.7)

... The ordinary year in the previous Roman calendar consisted of 12 months, for a total of 355 days. In addition, a 27-day intercalary month, the Mensis Intercalaris, was sometimes inserted between February and March. This intercalary month was formed by inserting 22 days after the first 23 or 24 days of February; the last five days of February, which counted down toward the start of March, became the last five days of Intercalaris. The net effect was to add 22 or 23 days to the year, forming an intercalary year of 377 or 378 days ...

... The leap day was introduced as part of the Julian reform. The day following the Terminalia (February 23) was doubled, forming the 'bis sextum - literally 'double sixth', since February 24 was 'the sixth day before the Kalends of March' using Roman inclusive counting (March 1 was the 'first day'). Although exceptions exist, the first day of the bis sextum (February 24) was usually regarded as the intercalated or 'bissextile' day since the third century. February 29 came to be regarded as the leap day when the Roman system of numbering days was replaced by sequential numbering in the late Middle Ages ...

The information above can now be consolidated into a pair of interconnected tables:

HELIACAL DATES:
*JULY 14 15 (196 = 264 - 68) 16 17 (*118)
ALCHITA   GIENAH  
September 20 21 (*184) Equinox 23 (266)
'August 24 (236) 25 (*157 = *314 / 2) 26 27
"August 10 (222) 11 12 (*144) 13
NAKSHATRA DATES:
*JANUARY 12 13 (= 81 - 68) 14 15 (*301 = *369 - *68)
SIRRAH ALGENIB PEGASI    
March 21 (0h) 22 23 (*368) 24
'February 22 (53) Terminalia 24 25
"February 8 9 (40) 10 (*327) 11
HELIACAL DATES:
JULY 14 15 16 17 18 (199)
*JULY 18 (199) 19 20 21 22
ACRUX     ALDERAMIN PORRIMA
September 24 25 26 27 (270) 28
'August 28 29 30 31 (243) 'September 1
NAKSHATRA DATES:
JANUARY 12 13 14 15 16
*JANUARY 16 17 18 19 20
    ANKAA

ALPHARD

  DELTA
March 25 26 27 28 29 (88)
'February 26 27 28 (59) 'March 1 2
"February 12 13 2-14 (45) 15 16