In the time of Gregory XIII the heliacal position of 'Middle' (Wasat, δ Gemini) was coinciding with day 185 (ºJuly 4) and counted from the March equinox in the preceding year it was day 314 + 50 % of 314 (equal to the number of glyphs on the G tablet). Possibly this could explain why the line drawn inside the head of mago in Ga2-14 ends abruptly in the middle of the head of the shark:

Antares at the time of rongorongo:
Rising in the east at sunset	June 1 (152)	0	0
15 days from winter solstice	July 6 (187)	35	35
Culmination at midnight	July 11 (192)	5	40
'Leap day'	July 12 (193)	1	41
Heliacal rising	November 25 (329)	136	177
Nakshatra day	May 28 (148)	184	361

... This Hercules is male leader of all orgiastic rites and has twelve archer companions, including his spear-armed twin, who is his tanist or deputy. He performs an annual green-wood marriage with a queen of the woods, a sort of Maid Marian. He is a mighty hunter and makes rain, when it is needed, by rattling an oak-club thunderously in a hollow oak and stirring a pool with an oak branch - alternatively, by rattling pebbles inside a sacred colocinth-gourd or, later, by rolling black meteoric stones inside a wooden chest - and so attracting thunderstorms by sympathetic magic ...

The oak-club definitely belongs to Pollux, whereas Castor often is depicted carrying 'a little spear' = an arrow (in addition to his string instrument):

Bow and arrow were for children only in Polynesia, in contrast to the spear (vero) which was a mortal danger for the king:

... A vestige of the practice of putting the king to death at the end of a year's reign appears to have survived in the festival called Macahity, which used to be celebrated in Hawaii during the last month of the year. About a hundred years ago a Russian voyager described the custom as follows: 'The taboo Macahity is not unlike to our festival of Christmas. It continues a whole month, during which the people amuse themselves with dances, plays, and sham-fights of every kind. The king must open this festival wherever he is. On this occasion his majesty dresses himself in his richest cloak and helmet, and is paddled in a canoe along the shore, followed sometimes by many of his subjects. He embarks early, and must finish his excursion at sunrise.

The strongest and most expert of the warriors is chosen to receive him on his landing. The warrior watches the canoe along the beach; and as soon as the king lands, and has thrown off his cloak, he darts his spear at him, from a distance of about thirty paces, and the king must either catch the spear in his hand, or suffer from it: there is no jesting in the business.

Having caught it, he carries it under his arm, with the sharp end downwards, into the temple or heavoo. On his entrance, the assembled multitude begin their sham-fights, and immediately the air is obscured by clouds of spears, made for the occasion with blunted ends. Hamamea (the king) has been frequently advised to abolish this ridiculous ceremony, in which he risks his life every year; but to no effect. His answer always is, that he is as able to catch a spear as any one on the island is to throw it at him. During the Macahity, all punishments are remitted throughout the country; and no person can leave the place in which he commences these holidays, let the affair be ever so important.'

Altair (α Aquilae) may have been a star which marked the end of 300 days, counted from the March equinox.

Only 3 footprints could be seen in the still wet sand on the brink of the Milky Way, because the left foot of Castor was down in the water:

According to Hevelius Castor wields a cat'o nine tails (another type of string instrument). In a modern star map these ψ stars are in Auriga:

The vertical line through Praja-pāti, Menkalinan, Mahashim, and γ Columbae, could have formed a 'mirror'. From beyond this mirror - crossing both the ecliptic path for the 'living' and the Milky Way leading downwards to the underworld of the dead (Toga) - 'land' was once again rising up.