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Once again. Like the astrologers who kept firm to the positions of the zodiacal constellations anciently, so was the Gregorian calendar quickly out of tune with the true star positions:

Gb6-25 (229 + 178) Gb6-26 (408) Gb6-27 (180) Gb6-28
Gb3-10 (300) Gb3-11 (72) Gb3-12 Gb3-13
θ Oct. (364.4) Al Fargh al Thāni-25 Uttara Bhādrapadā-27 / Wall-14 χ Pegasi (2.1), θ Andromedae (2.7)
0h (365.25) ο Oct. (1.3), ALGENIB PEGASI = γ Pegasi (1.8)
CAPH = β Cassiopeiae, SIRRAH = α Andromedae (0.5), ε Phoenicis, γ³ Oct. (0.8)
March 20 21 (0h) 22 (*1) 23 (82)
°March 16 (*360) 17 18 (77) 19
'February 21 (52) 22 (418) TERMINALIA 24 (*340)
"February 7 (403) 8 (*324) 9 (40) 10
NAKSHATRA DATES:
12h (182.6) ALCHITA = α Corvi, MA WEI (Tail of the Horse) = δ Centauri (183.1), MINKAR = ε Corvi (183.7), ρ Centauri (183.9) PÁLIDA = δ Crucis (184.6), MEGREZ = δ Ursae Majoris (184.9) Hasta-13 / Chariot-28
ο Virginis (182.1), η Crucis (182.5) GIENAH = γ Corvi (185.1), ε Muscae (185.2), ζ Crucis (185.4), ZANIAH = η Virginis (185.9)
September 19 (*182) 20 21 (264) EQUINOX
°September 15 (*178) 16 17 (260) 18
'August 23 (*155) 24 (236) 25 26
"August 9 (*141) 10 (222) 11 12
Ga5-8 (118) Ga5-9 Ga5-10 Ga5-11
21
Gb7-1 Gb7-2 (183) Gb7-24 Gb7-25
Gb3-14 Gb3-15 Gb4-7 Gb4-8
°March 20 0h (ACRUX) 'March 20 0h (SHERATAN)

From the time of Gregory XIII to the time of rongorongo the precession had moved the Sun 4 days earlier in the year as regarded from the positions of the stars. Therefore for instance Acrux was no longer at the Full Moon in °March 21 but 4 days later, in March 25:

Gb7-1 Gb7-2 (183) Gb7-3 Gb7-4 (414)
Gb3-14 Gb3-15 Gb3-16 Gb3-17 (78)
σ Andromedae (3.0), ι Ceti (3.3), ζ Tucanae (3.5), ρ Andromedae, π Tucanae (3.7) no star listed (4) ANKAA = α Phoenicis, κ Phoenicis (5.0)

ALPHARD (α Hydrae)

λ Phoenicis (6.3), β Tucanae (6.4)
March 24 (*3) 25 (84) 26 (*370) 27 (451)
°March 20 (*364) 0h 22 (81) 23
'February 25 26 (57) 27 (*343) 28 (424)
"February 11 12 (43) 13 (*329) All Hearts' Day
NAKSHATRA DATES:
CHANG SHA (Long Sand-bank) = ζ Corvi (186.3) INTROMETIDA = ε Crucis (187.4), ACRUX = α Crucis (187.5) 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)
September 23 (*186) 24 25 (268) 26
°September 19 20 (*183) 21 (264) 22
'August 27 28 (240) 29 30 (*162)
"August 13 14 (226) 15 (3.14) 16 (*148)
Ga5-12 Ga5-13 (123) Ga5-14 Ga5-15
Gb7-5 Gb7-6 (187) Gb7-7
Gb3-18 Gb3-19 (80) Gb3-20 (310)
ANDROMEDA GALAXY (M31), π Andromedae (7.7) ε Andromedae (8.2), DELTA = δ Andromedae (8.4), SCHEDIR =α Cassiopeiae (8.6), ζ Andromedae, μ Phoenicis (8.9) ξ Phoenicis (9.0), ρ Tucanae (9.1), DENEB KAITOS = β Ceti, η Phoenicis (9.4), AL NITHĀM = φ¹ Ceti (9.6)
March 28 (*372) 29 (88) 30 (454)
°March 24 (*368) 25 (84) 26 (450)
'March 1 (60) 2 (*346) 3 (427)
"February 15 (46) 16 (*332) 17 (413)
NAKSHATRA DATES:
α MUSCAE (190.2), τ Centauri (190.5), χ Virginis (190.7)

ALDERAMIN (α Cephei)

Al Áwwā'-11 / Shur-mahrū-shirū-18 (Front or West Shur?) ι Crucis (192.2), β Muscae (192.5), MIMOSA = β Crucis (192.9)
Sombrero Galaxy = M104 Virginis (191.1), ρ Virginis (191.4), PORRIMA = γ Virginis, γ Centauri (191.5)
September 27 (*190) 28 29 (272)
°September 23 24 25 (268)
'August 31 'September 1 (*164) 2 (245)
"August 17 18 (*150) 19 (231)
Ga5-16 Ga5-17 Ga5-18 (128)

At the time of rongorongo Porrima (*191) was at the Full Moon 4 nights later than in °March 25 (3-25, 84), viz. in March 29 (88) where the text has a vero.

... When Julius Caesar established his calendar in 45 BC he set March 25 as the spring equinox. Since a Julian year (365.25 days) is slightly longer than an actual year the calendar drifted with respect to the equinox, such that the equinox was occurring on about 21 March in AD 300 and by AD 1500 it had reached 11 March. This drift induced Pope Gregory XIII to create a modern Gregorian calendar. The Pope wanted to restore the edicts concerning the date of Easter of the Council of Nicaea of AD 325 ...

At the time of Gregory XIII the stars were in positions which were 4 days earlier in the year than at the time of rongorongo. Therefore nakshatra Porrima would have been close to the Full Moon 4 days earlier than in March 29, viz. in °March 25 (3-25).

From the time of Gregory XIII to the time of rongorongo the precession had moved the Sun 4 days earlier in the year as regarded from the positions of the stars. Therefore for instance Acrux was no longer at the Full Moon in °March 21 but 4 nights later, in March 25, and Porrima no longer at the Full Moon in °March 25 (3-25) but 4 nights later in March 29 (3-29):

NAKSHATRA READING:
242 1 122 3 102
Ga5-13 (123) Ga5-17 (127)
ACRUX PORRIMA
365 107
472 = 8 * 59