6. Antares could on Easter Island mark when the 'summer year' is beginning. The present heliacal rising of Antares does not coincide with any equinox or solstice. But 186 - 89 = 97 days earlier the heliacal rising of Regulus is indicating that spring equinox is close:

North of the equator Regulus is descending heliacally 275 - 242.7 = ca 33 days before autumn equinox and at the same time on Easter Island Regulus is rising 87 - 61.7 = ca 25 days before spring equinox. It therefore ought to be a better sign of summer in front than Antares.

South of the equator North of the equator
autumn equinox 266 89 = 266 - 177 spring equinox 80 (89)
Achird 266 + 11.7 = 277.7 92 = 358 - 266 Achird 89 + 11.7 = 100.7
winter solstice 358 = 266 +172 - 80 summer solstice 172 (181)
Sun returns (Naos) 23 (*122) = 87 - 64 87 Sun leaves (Naos) 202 (211)
Achir (Regulus) 266 + 153.7 - 358 = 61.7 Achir (Regulus) 89 + 153.7 = 242.7
spring equinox 87 = 358 + (266 - 172) - 365 autumn equinox 266 (275)
summer solstice 177 = 87 + (356 - 266) 90 = 177 - 87 winter solstice 356 (365)
Sun leaves (Altair) 202 (*301) = 23 + 179   Sun returns (Altair) 16 (25)

The heliacal rising of Regulus on Easter Island is ca 25 + 72 days earlier than that of Antares. To be more exact, with Antares at glyph number 186 we must put Regulus at glyph number 186 - (250.1 - 153.7) = 89.6 or 90:

36 20
Ga1-27 (*92) Ga1-28 Ga3-6 (*130) Ga3-7 Ga3-8 (68)
winter solstice Beehive (131.4)
20
Ga4-5 (**61) Ga4-6 (*154) Ga4-7 (91)
Regulus (153.7)
Ga5-1 (112) Ga5-2 Ga5-3 Ga5-4 (**87) Ga5-5 (*180)
      spring equinox (179 - 92 = 87) 
69
Ga7-16 (*250) Ga7-17 (187)
Antares (250.1) summer begins

Now we have washed away any trace of our familiar month names. But we have kept the cardinal points (a mixed blessing) and the preeminence of Antares.