period 4
	Ga3-17 (77)	Ga3-18	Ga3-19 (*143)
	Tureis (140.8)	Al Minhar al Asad (142.6)	Alphard (143.3)

And Alphard is not at Ga3-18 but in the position 'one more'. Considering period number 4 as 'one more' than 3 - perhaps alluding to a dark last quarter - we can imagine 3 planets (Venus, Saturn, and Sun) illustrating what happens behind the dark cloth.

Perhaps the Tahitian star pillar list was constructed at a time when Alphard rose 1 day earlier. If so, then we might be able to discern a difference with 1 day (compared to our present right ascension values) also for other prominent stars. For instance would Betelgeuze be at glyph number 24 instead of at atariki in Ga1-24:

Ana-varu (?)
Ga1-23 (24)	Ga1-24 (*89)	Ga1-25 (498)
Saiph (495.5)	Wezn (496.6), χ¹ Orionis,  Betelgeuze (497.3)	Praja-pāti, Menkalinan, and Mahashim (498.3), γ and η Columbae

The illustration in Ga1-23 indeed could show how the path of Sun is leading down into the River.

I think it is improbable that there should be a difference in 1 day between the positions of the star pillars in the Tahitian list and the structure in the mind of the creater of the G text. Therefore we should instead consider counting with Gb6-25 (Saturn) as day number 1. This would eliminate the problem of the position of Sirrah:

Sirrah (?)		63	23	Ana-varu (?)
Gb6-25 (408)	Gb6-26			Ga1-23	Ga1-24	Ga1-25 (498)
α Andromedae, β Cassiopeiae (1.5)				Betelgeuze (497.3)		Praja-pāti, Menkalinan, and Mahashim (498.3), γ and η Columbae
91

497.3 - 407 = 90.3 and 498.3 - 407 = 91.3. The Lord of Created Beings (Praja-pāti, δ Aurigae) should be at a cardinal point and 4 * 91.3 = 365.2 - which is very close to the length of the solar year.

Thus I think we have 'proven' that Alphard (Ana-heu-heu-po) is referred to in Ga3-18.

The 'nose of the Lion' (Al Minhar al Asad, κ Leonis) can be regarded as rising in the same day: