7. If Alphard at the neck of the Hydra marks the beginning of 300 days of 'land', then we ought to put the star where it really should be, viz. in day number 144:

150
Ga3-17 (*141) Ga3-18 Ga3-19 Ga3-20 (80)
Tureis (140.8)   Al Minhar al Asad (142.6) Alphard (143.3)
147
Gb5-24 (378) Gb5-25 Gb5-26 Gb5-27 Gb5-28 Gb5-29
150

Maybe the heuheu glyph is referring to the stars τ¹, τ², and A in the 'loop-hole' in the Hydra? No, they are rising later than Alphard:

Alphard 09h 27m 35.25s 09h 27.588m 143.3
τ¹ Hydrae 09h 29m 08.84s 09h 29.147m 143.7
τ² Hydrae 09h 31m 58.93s 09h 31.982m 144.4
A Hydrae 09h 34m 32.64s 09h 34.544m 145.1
Alphard α Hydrae 1.99 08° 26′ S 09h 25m 143.3 551.3
Ukdah τ¹ Hydrae 4.59 02° 46′ S 09h 27m 143.7 551.7
τ² Hydrae 4.54 01° 11′ S 09h 29m 144.4 552.4
A Hydrae 5.56 05° 55′ S 09h 32m 145.1 553.1
ι Hydrae 3.90 01° 08′ N 09h 37m 146.4 554.4

There are 4 stars which combine into the Knot, and the last of them is above the equator of the sky.

Ga3-20 (80) Ga3-21 Ga3-22 Ga3-23 (*147)
Alphard (143.3), τ¹ Hydrae (143.7)  τ² Hydrae, Alterf (144.4), A Hydrae (145.1) ι Hydrae (146.4)
The Knot (Ukdah)

... τ¹, 4.9, flushed white, and τ², 4.6, lilac, with ι and the 5th magnitude A, form the curve in the neck, Ptolemy's Καμπή; but Kazwini knew them as Ukdah, the Knot.

If we count beyond mago in Ga3-23 there are 147 glyphs to the end of side a. Twice 147 = 294 is very close to 10 * 29½. Hakaariki in Gb5-24 is number 295 counted beyond mago.

On the other hand, we can count 52 * 9 (at the last glyph in line b5) = 468 which may be a Sign. 31 * 7 = 217 or 'one more' than 216 = 8 * 27 = 2 * 2 * 2 * 3 * 3 * 3 = 6 * 6 * 6.

468 - 216 = 252 = 36 weeks.

Ga3-17 (*141) Ga3-18 Ga3-19
Tureis (140.8)   Al Minhar al Asad (142.6)
147
Ga3-20 (80) Ga3-21 Ga3-22 Ga3-23 (*147)
Alphard (143.3), τ¹ Hydrae (143.7)  τ² Hydrae, Alterf (144.4), A Hydrae (145.1) ι Hydrae (146.4)
The Knot (Ukdah)
147
Gb5-24 (378) Gb5-25 Gb5-26 Gb5-27 Gb5-28 Gb5-29 (383)
150

Number 147 seems to be a Sign, and it could allude to 21 weeks, which in turn makes us remember the 42 assessors in the Underworld (cfr in chapter 8):

Easter Island is in a way down in the Underworld (south of the equator) and there the days are called 'nights'. When there is winter ('night') north of the equator (as in Egypt) it is summer on Easter Island.

Heuheu in Ga3-18 has a kind of hole and I earlier saw this space between the birds as an illustration of high summer. The hole (ana) through which Sun emerges in spring could be formed like the 'air space' between sky and earth in high summer.

The 5th Tahitian star pillar (ana) is said to be Alphard, but from the above we can instead guess Ana-heuheu-po could be the name of the week beginning at Ga3-17. Alphard is in the center of this week.