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8. Maybe I should add another line in my table for the time when Antares is descending in the west late at night, possibly described at Gb2-10:

Gb2-5 Gb2-6 Gb2-7 Gb2-8 Gb2-9 Gb2-10 (266)
Gb2-11 Gb2-12 Gb2-13 Gb2-14 Gb2-15 Gb2-16 (272)

I think the time from culmination at midnight to descending in the west at dawn ought to be the same as the time from rising in the east at sundown to culmination at midnight. Although in Gb2-10 the left side of the broken line inside the head of the shark is shorter:

37 102 79
Ga2-14 (45) Ga3-23 (83) Ga7-16 (186) Gb2-10 (266)
7h (106.5) 221

If we reduce 266 with twice 40 the result is 186 which points at the day number beyond equinox for the heliacal rísing of Antares in Ga7-16. 186 is also the number of days from Ga2-14 to the end of side a. 230 - 44 = 186.

I think we have proven without doubt that Antares is depicted both in Ga2-14 and in Gb2-10.

The distance from the night in which Antares reaches zenith at midnight to the date of Gb2-10 is 221 days, the Toliman number. 45 + 221 = 266.

If time runs on beyond 'December 31 and Ga8-18, then Gb2-10 should be at day 44 from 'January 1. 266 - 222 = 44:

63 56 121
Gb6-25 Gb6-26 Ga2-26 Ga2-27 Ga7-10 (180)
'March 20 '0h (80) 119 'July 19 (200) '20 121 'November 19 (323)
122 (= 365¼ / 3) 122 (= 365¼ / 3)
39
Ga8-16 Ga8-17 Ga8-18 (222) Ga8-19 Ga8-20
39 'December 29 '30 '31 (365) 'January 1 '2

However, the 'star year' seems to necessitate a 'leap day' in order to keep pace with our calendar:

Antares
Rising in the east at sunset  'June 1 (152) 0 0
Culmination at midnight 'July 11 (192) 40 40
Heliacal rising 'November 25 (329) 137 177
Leap day 1 229
Culmination at midnight 'July 11 (192) 228

Our calendar measures the number of dawns in a year, which is one more than 364 because Earth moves around Sun once a year.

Such a leap day could be e.g. at Gb8-30, although this is far from certain. But I guess there could be a continuity from 'January 1 at Ga8-19 to 'February 13 (44) at Gb2-10. This will put Gb2-10 immediately before Ga2-14:

206 44
Gb2-10 (266) 250 Ga2-14 (45)
'July 6 (187) 178 187 'July 7 (188)
365
"May 4 (124) 240 1 124 "May 5 (125)
365

The sign inside the shark's head in Ga2-14 was presumably invented after the broken line sign in Gb2-10 was adopted into the common 'glyph vocabulary' of Easter Island. It was not used very often, but it is in harmony with the full moon glyph in the Mamari moon calendar:

Ca7-24 Gb2-10

At full moon the reflected light from Sun is at its maximum, increasing from left and decreasing towards right. Turning our heads around and reflecting on the light from Moon we can imagine a similar increase followed by decline and then see it in Gb2-10. On Easter Island July is a month with Sun absent.