2. On the other hand, the double maitaki glyphs could represent the Pleiades:

"The Rapa Nui ethnographers say that 'old men' watched the stars on Poike, from a cave on the west coast or from near an ahu where six boulders represented the Pleiades …" (Van Tilburg)

According to Van Tilburg 'six stones', Tauono, is one of the names of the Pleiades.The Polynesians regarded the constellation Matariki (another name for the Pleiades) as having six stars (not seven as is customary with us).

Ancient times most peoples regarded summer and winter as two different 'years' and saw spring equinox - defined by the heliacal rising of the Pleiades - as the start of the summer 'year'.

In more modern times, and for people living north of the equator like the Hawaiians, the Pleiades were looked for in the evening, and when they appeared again - late in autumn - it was regarded as an announcement of the arrival of the new year. The Pleiades was once again in the night sky, Matariki i nika, after having been below the horizon, Matariki i raro.

South of the equator stars were observed preferentially in the early morning ('heliacal rising', rising together with the sun), not in the evening. The constellation could therefore serve the same purpose as north of the equator and announce the beginning of new year at the same time (winter) as on Hawaii - it is just a matter of choosing the right time for looking. However, new year was mostly defined to begin in late Novermber - early December anyhow:

... In the Hawaiian, Samoan, Tongan, Society, Marquesan, and some other islands the new year began in late November or early December with the first new Moon after the first appearance of the Pleiades in the eastern sky in the evening twilight.  Notable exceptions to the general rule are found in Pukapuka and among certain tribes of New Zealand where the new year was inaugurated by the first new Moon after the Pleiades appeared on the eastern horizon just before sunrise in June. Traces of an ancient year beginning in May have been noted in the Society Islands, but there is some uncertainty about the beginning of the year in native annals generally, at least as reported by missionaries and others, due perhaps to the desire to make the Polynesian months coincide with the stated months of the modern calendar ...

For Rapa Nui, as for the Maori, the Mangarevans and the rest of the people of the Southern Hemisphere, the rising of the Pleiades is almost simultaneous with the Austral June solstice ... it is probable that the Rapa Nui ritual calendar, as that of the Maori, Mangarevans, Samoans, Tongans and other Polynesians began in July following the rising of the Pleiades ...

The ritual calendar on Easter Island was, it seems, beginning in July (following the heliacal rising of the Pleiades), but maybe the new year began in summer (following the rising of the Pleiades in the evening sky).

If the constellation Tauono was watched for in the morning, then double maitaki glyphs could refer to winter solstice (= summer solstice on Hawaii), if watched for in the evening they could refer to summer solstice (= winter solstice on Hawaii).