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My key for reading the G text is the correlation with the distance between the heliacal positions (in rongorongo times) of Ana-muri and Ana-mua:

Sheratan 12 180 Syrma 10 (193)
May 28 (148) November 25 (329)
Ga1-4 (5) Ga7-16 (186)
Aldebaran (68.2) Antares (249.1)

I have assumed the G text maps the heliacal star positions - after having ruled out the dates for midnight culminations (which could not be put in parallel with the sun-oriented Gregorian and Arabic manzil calendars).

But I did not rule out the nakshatra positions. However, after adopting the key number 181 for my star model it must be the heliacal rising of Aldebaran in Ga1-4 and the heliacal rising of Antares in Ga7-16 (given that these glyphs indeed represent this basic pair of stars). By using 181 days instead of half 365 days there is an assymmetry which makes it possible to distinguish heliacal stars from their nakshatra stars at the other end of the sky:

Date Heliacal star RA distance Nakshatra star
April 1 (91) η Andromedae (11.4) 181.5 Mimosa (192.9)
April 17 (107) Polaris (26.6) 181.9 Benetnash (208.5)
April 24 (114) Mira (33.7) 181.1 Neck (214.8)
May 26 (146) Ain (65.7) 181.3 Heart (247.0)
May 28 (148) Aldebaran (68.2) 180.9 Antares (249.1)
July 6 (187) Wezen (107.1) 181.3 Nunki (288.4)
August 21 (233) Regulus (152.7) 181.9 Sadalmelik (334.6)
September 4 (247) Dubhe (166.7) 181.1 Fomalhaut (347.8)

In the text of C there is also a key which can be used to correlate glyphs with heliacal stars, viz. the first glyph in line a2 which probably represents right ascension (RA) day 27 and where several important stars are accumulated:

Almuqaddam 12 (336) 13 Al Muakhar 1 2 3 4
April 17 (107) 18 19 20 21 22
Ca2-1 (27) Ca2-2 Ca2-3 Ca2-4 Ca2-5 Ca2-6
Te heke erua tagata te henua tagata oho ki tona huaga kua oho
Polaris, Baten Kaitos (26.6), Metallah (26.9), Segin, Mesarthim (27.2), Sheratan (27.4)   2h (30.4)    

The end of line a1 seems to be connected with the beginning of line a2:

Almuqaddam 10 11 (700) 12 (336)
April 15 16 (471) 17 (107)
Ca1-25 Ca1-26 Ca2-1 (27)
kiore ki te huaga kua moe ki te tai. Te heke
Achernar (23.3)   Benetnash (208.5)
Polaris (26.6)

The 'head' in the center, between the bottom oval at left and the top oval at  right, could represent 'earth', because Achernar is very low down and Polaris very high up. In other words, these 3 glyphs could illustrate the 3 levels of the world, the Underworld, the World of the Living, and the Sky.

When Maui with his hook draw up 'earth' from the deeps he used a line which threatened to tangle:

... The fish came near the surface then, so that Maui's line was slack for a moment, and he shouted to it not to get tangled ...

Possibly his line alluds to Eridanus, which curiously makes a conspicious retrograde (hoki amuri) movement on its way up from Achernar:

Depending on orientation the 'river' Eridanus could be seen as a long fishing line, beginning close down to 0h and far in the south (toga). Rigel could represent the strong fist of Maui.

... The canoe heeled over, and was shipping water fast. 'Let it go!' cried the frightened brothers, but Maui answered with the words that are now a proverb: 'What Maui has got in his hand he cannot throw away.'

I suggest there are some heliacal stars which are embedded in the rongorongo texts, although the myths are mostly retold in the night under the piercing lights of the nakshatra constellations on the other side of the sky. The important heliacal stars are like stepping stones above the surface of the mythic sea.