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According to my estimates and conclusions: At the time when the rongorongo tablets were created the star Ain (ε Tauri, the 'eye' of the Bull) rose heliacally - i.e. together with the Sun -  in approximately day 80 (March 21) + 65 = 145 (May 25). And when Vega (α Lyrae) culminated at midnight it was in day 145 + 79 = 224 (August 12):

no glyph 77
Ga1-1 (1) Ga1-2
Hyadum II (δ¹ Tauri) (64.2) Net-19 no star listed (66)
AIN, θ¹ Tauri, θ² Tauri (65.7)
May 24 25 (145) 26
Ga3-21 (80) Ga3-22 Ga3-23 Ga3-24 Ga4-1
A Hydrae (144.1)

Vega

Ukdah (145.4), κ Hydrae (145.5), Subra (145.8) ψ Leonis (146.4), Ras Elaset Australis (146.6) Vathorz Prior (147.9) υ¹ Hydrae (148.4), Ras Elaset Borealis (148.7)
August 12 (224) 13 14 15 16
March 21 80 0
31 90 10
April 30 120 40
May 31 151 71
June 21 172 92
30 181 101
July 31 212 132
August 31 243 163
September 22 265 185
30 273 193
Oktober 31 304 224
November 30 334 254
December 21 355 275
31 365 285
January 31 31 316
February 28 59 344
March 21 80 365
31 90 375
April 30 120 405
May 31 151 436

The constellations, however, mainly originated in Babylonian times, when the Sky Bull rose with the Sun around 64 days earlier in the year and at a time when the Hyades Gate (between the stars Hyadum I and Hyadum II) would have been around the northern spring equinox (0h):

no glyph 77
Ga1-1 (1) Ga1-2
0h MARCH 22 (*1) 23
Hyadum II (δ¹ Tauri) (64.2) Net-19 no star listed (66)
AIN, θ¹ Tauri, θ² Tauri (65.7)
May 24 25 (145) 26
Ga3-21 (80) Ga3-22 Ga3-23 Ga3-24 Ga4-1
JUNE 9 10 11 12 13 (164)
A Hydrae (144.1)

Vega

Ukdah (145.4), κ Hydrae (145.5), Subra (145.8) ψ Leonis (146.4), Ras Elaset Australis (146.6) Vathorz Prior (147.9) υ¹ Hydrae (148.4), Ras Elaset Borealis (148.7)
August 12 (224) 13 14 15 16 (228 = 164 + 64)

In order to understand the text it is necessary to coordinate the heliacal stars not only with their positions in rongorongo times but also with their positions around 64 / 365 * 26000 = 4500 years ago.

In rongorongo times the Sun was at the Head of the Lion (Ras El Aset) in the middle of August, but the head (the beginning) of high summer (the Lion) should come earlier and the middle of June would have been a more suitable place.