Looking again at the pair of glyphs corresponding to the positions of heliacal Aldebaran respectively the heliacal rising of Antares we can now add dates which for the creator of the text could have been significant:
From the ancient time when Aldebaran rose with the Sun (rose heliacally) in March 25 to the time when Aldebaran rose heliacally in May 28 the precession had moved the dates ahead in the year with 148 - 84 = 64 days. And 64 = 8 * 8, equal to the number of squares on a chessboard and also 32 less than 96 (= 3 * 32 = 6 * 16 = 12 * 8 = 24 * 4 = 48 * 2).
Antares would have risen heliacally in SEPTEMBER 22 (265) instead of in November 25 (329) because 329 - 64 = 265. And SEPTEMBER 22 (265) was 100 days earlier than DECEMBER 31 and it was also the date for the southern spring equinox (= the northern autumn equinox). In order to distinguish between the dates at the time of rongorongo and the dates when Aldebaran rose with the Sun in MARCH 25 the latter dates are here written with CAPITAL LETTERS. Although the creator of the glyph text may have been aware of the phenomenon of the proper motions of the so-called fixed stars I guess he in general did not try to indicate such things in his 'star map' text. Therefore, when Antares rose with the Sun in SEPTEMBER 22 Aldebaran should have risen with the Sun in MARCH 25 (84). We can count with 71 (= 26000 / 365¼) years for each day of precessional change and 64 * 71 = 4544 years. If the creator of the G text had used 1842 A.D. as his year of reference, then Aldebaran would have risen in day 84 (counted from January 1) approximately in the year 4544 - 1842 = 2702 B.C. A nice number equal to 14 * 193. And 1842 - 260 = 1582: The Julian calendar day Thursday, 4 October 1582 was followed by the first day of the Gregorian calendar, Friday, 15 October 1582 (the cycle of weekdays was not affected). Our convention for the day of sping equinox (March 21) is based on a decision by the Pope Gregory XIII: When Julius Caesar established his calendar in 45 BC he set March 25 as the spring equinox. Since a Julian year (365.25 days) is slightly longer than an actual year the calendar drifted with respect to the equinox, such that the equinox was occurring on about 21 March in AD 300 and by AD 1500 it had reached 11 March. This drift induced Pope Gregory XIII to create a modern Gregorian calendar. The Pope wanted to restore the edicts concerning the date of Easter of the Council of Nicaea of AD 325. The true date for the time when night and day are equal in length varies slightly from year to year with March 20 as a better average than March 21. But then it would have been 79 days from January 1 instead of the nicer 80. Evidently the creator of the glyph text could have fixed his position for heliacal Aldebaran in MARCH 25 because this was the Julian date for the northern spring equinox.
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