The length of a calendar cycle is not necessarily 365 days:
At the time of the Hyades Gate heliacal Antares was around SEPTEMBER 22 (day 265 which by me is regarded as the date for the northern autumn equinox). The 16th Arab station Al Kalb, the Heart of the Scorpion, would have been at this equinox - i.e. spring equinox on Easter Island - but in rongorongo times Ana-mua (the star in front) had moved ahead to day 265 + 64 = 329 (November 25):
There are 185 days from March 21 (80) to September 22 (265) because the northern summer half of the year is 5 days longer than the southern. This could explain why Julius Caesar had put March 25 as his date for northern spring equinox - it would give a more balanced position at the opposite side of the year compared to September 22:
By looking at the stars close to the Full Moon in March 25 it would then have been easy to deduce where the Sun was. But if March 25 was said to be the point of the northern spring equinox, then the astronomers may have thought the calendar date for the southern spring equinox would come 185 days later. 84 (March 25) + 185 = 269 (September 26). In Gb5-19 the moa (a type of 'bird' unable to fly) has no eye (can no longer see) and his feet are gone. In May 30 the 'nighttime' of the year was ahead for people on Easter Island. Glyph 370 (= 365 + 5) corresponds - according to my suggestions - to MARCH 25. Another 5 glyphs ahead is a similar glyph (Gb5-22). I have here with double asterisks (**) indicated the distance from MARCH 25. In rongorongo times this position was June 2 (153) and by adding 183 we will reach day 153 + 183 = 336 (December 2). 336 = 4 * 84 = 12 * 28 = 14 * 24 = 48 weeks, which could have been regarded as the end of some calender cycle. At the time of the Hyades Gate and in the night of MARCH 30 the position among the stars of SEPTEMBER 29 (272) would have been close to the Full Moon. 336 (December 2) - 64 = 272 (SEPTEMBER 29). 272 is twice 136 and this may have been important. Could the end of a cycle have been at day 3 * 136 = 408 counted from 0h? At the Rogo figure in Gb6-26?
The Egyptian expression 'lady of every heart circuit' (Hathor) could mean there were severeal 'circuits' (calendar cycles) originating at the same point in time. The number of glyphs on the G tablet is only 3 * 157 = 471, perhaps depending on the limited surface on the tablet. Maybe there was not room enough for 2 * 314 = 628 days or maybe the text never was intended to cover more than 471 days. Maybe 3 times some fundamental time length could have been used for all 'circuits' in the text. But this idea of mine is pure speculation. To have a Rogo figure in Gb6-26 could have been an important feature of the design. 62 * 6 = 372 = 12 * 31. But July 5 (186) is an extrapolation forward from May 24 (144). 144 + 407 = 551 = 365 + 186. Should we instead extrapolate backwards from May 24 (144) the result must be different (because 365 < 471 < 2 * 365):
Rogo in Gb6-26 could be motivated either because of the northern spring equinox or he may have been positioned there in order to point out July 6. Or maybe there were several reasons. July 6 (187) + 183 = 370 and on the C (Mamari) tablet the number of glyphs is 740 (= 2 * 370). 370 is also the synodic cycle of the planet Uranus (Latin name for the Greek sky god Ouranos):
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