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The text on side a ends at a time which can be coordinated with the heliacal stars in A.D. 1582, when the Pope Gregory XIII introduced his updated version of the Julian calendar:

... Gregory dropped 10 days to bring the calendar back into synchronisation with the seasons. Accordingly, when the new calendar was put in use, the error accumulated in the 13 centuries since the Council of Nicaea was corrected by a deletion of ten days. The Julian calendar day Thursday, 4 October 1582 was followed by the first day of the Gregorian calendar, Friday, 15 October 1582 (the cycle of weekdays was not affected) ...

NOVEMBER 1 2 (306) 3 (*227) 4 5
Ga8-22 Ga8-23 Ga8-24 (227) Ga8-25 Ga8-26
19h (289.2) Al Baldah-19 ALADFAR = η Lyrae (291.1), NODUS II = δ Draconis (291.5), ψ Sagittarii (291.6), τ Draconis (291.7), θ Lyrae (291.8) ω Aquilae (292.1), ρ Sagittarii (292.6), υ Sagittarii (292.7) π Draconis, ARKAB PRIOR = β¹ Sagittarii (293.0), ARKAB POSTERIOR = β² Sagittarii, ALRAMI = α Sagittarii (293.2), χ Sagittarii (293.6)
λ Aquilae (Ant.) (289.1), γ Cor. Austr (289.3), τ Sagittarii (289.4), ι Lyrae (289.5), δ Cor. Austr. (289.8) AL BALDAH = π Sagittarii, ALPHEKKA MERIDIANA = α Cor. Austr. (290.1), β Cor. Austr. (290.2)
January 4 5 (*290) 6 7 (372) 8
°December 31 °January 1 2 (*287) 3 (368) 4
'December 8 9 10 (*264) 11 (345) 12
"November 24 25 (329) 26 (*250) 27 28
NAKSHATRA DATES:
MAY 3 (123) 4 5 (*45) 6 (*411) 7 (492)
WEZEN = δ Canis Majoris (107.1), τ Gemini (107.7), δ Monocerotis (107.9) no star listed (108) λ Gemini (109.4), WASAT = δ Gemini (109.8) no star listed (110) ALUDRA = η Canis Majoris (111.1), PROPUS = ι Gemini (111.4),  GOMEISA = β Canis Minoris (111.6)
July 6 (*107) 7 8 9 (190) 10
°July 2 3 (184) 4 5 6 (*107)
'June 9 10 (161) 11 12 13 (*84)
"May 26 27 28 (148) 29 30 (*70)

In rongorongo times, however, which according to my interpretations was approximately another 4 precessional days later, the star π (Al Baldah) - marking the 'corner' in Sagittarius - was at the Sun in January 5 (i.e. 290 days after 0h).

Egyptian sebchet Phoenician pe Greek pi Π (π)

Wikipedia: '... according to a theory by Theodor Nöldeke from 1904, some of the letter names were changed in Phoenician from the Proto-Canaanite script ... pit 'corner' to pe 'mouth' ...'

However, I think the Egyptian source hieroglyph could have been Gardiner's O14 (sebchet), a sign which illustrates a corner with feather-like ornaments upon the walls. The meaning was 'portal' according to Wilkinson. Or why not an Archway for exit, the Mayas had a 'grasping hand' (Chikin) in the west:

 

To be in a corner means there is no way forward.

Curiously the haú type of glyph looks like a mixture between Phoenician pe and Egyptian sebchet, especially if we should look at pe from the opposite side (i.e. if we should read the text from right to left in Arab fashion):

sebchet haú pe

There were 145 (= 290 / 2) days from JUNE 10 (161) to this 'corner' in NOVEMBER 2 (306):

DECEMBER 7 8 9 (343) 10 11 (*265)
β Cephei   ξ Aquarii   ε Pegasi
Gb2-6 Gb2-7 Gb2-8 Gb2-9 (35) Gb2-10 (265)
KAKKAB NAMMAX (Star of Mighty Destiny)
DECEMBER 12 171 JUNE 2 (153) 7 JUNE 10 11 (162) 12 142 NOVEMBER 2 (306)
 θ Piscis Austrini ξ Cancri ι Hydrae  ε Leonis υ Carinae π Sagittarii
Gb2-11 Ga3-14 (73) Ga3-22 (81) Ga3-23 Ga3-24 Ga8-23 (226)
All Hearts' Day Right foot of Pollux The Knot (180) The Lion's Head Vathorz Prior The Corner (325)
181 145 = 5 * 29

In 1582 A.D., which was 260 years earlier than my preferred year for rongorongo, there was evidently no important star rising with the Sun at 0h. But close to the Full Moon and at the opposite side of the sky was Acrux and the other stars of the Southern Cross - as if a reminder of Gregory's role as Pope for the Christianity:

1842 A.D. 1582 A.D. 76 B.C. 1070 B.C. 2703 B.C
Sirrah °Acrux 'Sheratan "Bharani AIN
0 3 27 (= 3 + 24) 41 (= 27 + 14) 64 (= 27 + 37)
®

JANUARY 19 (384) 20 (*305) 21 22
Gb7-1 Gb7-2 (183) Gb7-3 Gb7-4 (414)
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 (83) EQUINOX 26 (*370) 27 (451)
°March 20 (79) 21 (0h) 22 (*366) 23 (447)
'February 25 26 (57) 27 (*343) 28 (424)
"February 11 12 (43) 13 (*329) 14
NAKSHATRA DATES:
JULY 21 7-22 (*123) 23 24 (205)
Chang Sha (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) EQUINOX
'August 27 28 (340) 29 30 (*162)
"August 13 14 (326) 15 16 (*148)

... Ecclesiastically, the equinox is reckoned to be on 21 March (even though the equinox occurs, astronomically speaking, on 20 March in most years) .... When Julius Caesar established his calendar in 45 BC he set March 25 as the spring equinox ...

Gregory XIII changed the Julian date for spring equinox with 4 days - which also 'happened to be' the precessional distance from Gregory up to the time of rongorongo. Could they on Easter Island have maintained March 25 as the date for the equinox? I have chosen, in my table above, to distinguish between 0h and the Julian idea of the time for the northern spring equinox.

At the time of Gregory XIII it was day 183 after 0h when Acrux rose with the Sun. And at the end of side a on the G tablet the Full Moon reached day 107 after 0h:

NOVEMBER 1 2 (306) 3 (*227) 4 5
Ga8-22 Ga8-23 Ga8-24 (227) Ga8-25 Ga8-26
19h (289.2) Al Baldah-19 ALADFAR = η Lyrae (291.1), NODUS II = δ Draconis (291.5), ψ Sagittarii (291.6), τ Draconis (291.7), θ Lyrae (291.8) ω Aquilae (292.1), ρ Sagittarii (292.6), υ Sagittarii (292.7) π Draconis, ARKAB PRIOR = β¹ Sagittarii (293.0), ARKAB POSTERIOR = β² Sagittarii, ALRAMI = α Sagittarii (293.2), χ Sagittarii (293.6)
λ Aquilae (Ant.) (289.1), γ Cor. Austr (289.3), τ Sagittarii (289.4), ι Lyrae (289.5), δ Cor. Austr. (289.8) AL BALDAH = π Sagittarii, ALPHEKKA MERIDIANA = α Cor. Austr. (290.1), β Cor. Austr. (290.2)
January 4 5 (*290) 6 7 (372) 8
°December 31 °January 1 2 (*287) 3 (368) 4
'December 8 9 10 (*264) 11 (345) 12
"November 24 25 (329) 26 (*250) 27 28
NAKSHATRA DATES:
MAY 3 (123) 4 5 (*45) 6 (*411) 7 (492)
WEZEN = δ Canis Majoris (107.1), τ Gemini (107.7), δ Monocerotis (107.9) no star listed (108) λ Gemini (109.4), WASAT = δ Gemini (109.8) no star listed (110) ALUDRA = η Canis Majoris (111.1), PROPUS = ι Gemini (111.4),  GOMEISA = β Canis Minoris (111.6)
July 6 (*107) 7 8 9 (190) 10
°July 2 3 (184) 4 5 6 (*107)
'June 9 10 (161) 11 12 13 (*84)
"May 26 27 28 (148) 29 30 (*70)

From ρ Andromedae (together with θ and σ at her right arm) to Alrami (α in the Archer) there were 293 - 3 = 290 days, which might explain why 29 was an important measure in the rongorongo texts. °March 20 (3-20) was the astronomically correct date for spring equinox.

Sumerian SAG Phoenician resh Greek rho Ρ (ρ)

... Resh (Arabic: ۥ) is the twentieth letter of many Semitic alphabets, including Phoenician, Aramaic, Hebrew ... The word resh is usually assumed to have come from a pictogram of a head, ultimately reflecting Proto-Semitic *raۥ(i)š-. The word's East Semitic cognate, rēš-, was one possible phonetic reading of the Sumerian cuneiform sign for 'head' (SAG).