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In today's (March 21) newspaper I found a little notice about March 12:

Earlier day and night were regarded as of equal length in March 12. This idea remained in people's minds also after 1753 when the Gregorian calendar was adopted.

The name connected with March 13 was Gregorius - later changed to the more modern form Gregor - I discovered via the Swedish version of Wikipedia. It was Greger from the year 1901 and Gregorius from 1882. Before 1882 the name Gregorius had been connected with March 12, but at that time it was moved to March 13 to give room for the name Viktoria for reasons connected with the Swedish royalty.

I thought March 12 (= 3-12) could allude to 312 = 4 * 78, where 78 could correspond to the synodic cycle of Mars divided by 10 (i.e. like a 'month of Mars').

31 (January) + 28 (February) + 12 (March) = 71, as if to indicate the number of years needed for the precession to move the stars ahead in the year with 1 day.

March 11 12 (71) 12 March 25 (84)
Cb14-1 (722) Cb14-2 Cb14-15 (736)

I searched for some reason which could explain why the equinox day was not March 14 (3-14), but then I discovered the 'great sweep' in Cb14-1, which may have alluded to π by way of 722, i.e. the common equation 22 / 7 = π 'backwards'.

This is becoming a bit complicated, but we cannot avoid following the trail. However, we can try to look in another direction for a while:

"According to the later writers Censorinus and Macrobius, the ideal intercalary cycle consisted of ordinary years of 355 days alternating with intercalary years, alternately 377 and 378 days long.

In this system, the average Roman year would have had 366¼ days over four years, giving it an average drift of one day per year relative to any solstice or equinox.

Macrobius describes a further refinement whereby, in one 8-year period within a 24 year cycle, there were only three intercalary years, each of 377 days (thus 11 intercalary years out of 24). This refinement averages the length of the year to 365.25 days over 24 years." Wikipedia)

I made a table for the described 4-year period:

355

377

355

378

355

732

1087

1465

355

366

362⅓

366¼

And then another table for the 24-year period:

8

8

8

2930

355

377

355

377

355

377

355

355

2930

355

732

1087

1464

1819

2196

2551

2906

366¼

(2930 + 2906) / 16 = 364¾

365¼

The component 378 may have been especially interesting, because it suggested Saturn was involved:

 Synodic period

Orbital period

Mars

779.96

1.88 years

687

Mercury

115.88

0.24 years

88

Jupiter

398.88

11.86 years

4332

Venus

583.92

0.62 years

227

Saturn

378.09

29.46 years

10760

(355 + 377) / 2 = 366 could have been the reason behind a rongorongo cycle with 366 days.

By manipulating the order generated from the 3 kinds of year (355, 377, and 378) it was possible to reach an average year equal to the Julian measure. But 365¼ as the length for the solar year had always been known (or to be more precise from the time when someone bothered to measure its length) and it would have been quite easy to use a standard year with 365 days and then to add 1 day every 4th year.

Towards the end of side a could be one of the places for juggling with 3 kinds of year: 362, 372, and 378 days long:

Ca13-19 (362) Ca13-20
*Ca14-9 (372) *Ca14-10 *Ca14-11 *Ca14-12 *Ca14-13 *Ca14-14
*Ca14-15 (378) *Ca14-16 *Ca14-17

The Saturn synodic cycle (*Ca14-15) seems to be referred to also at Ca13-19. The vero glyphs are the same.

362 + 378 = 740 = 392 + 348.

vero Ca13-19 (362) *Ca14-9 (372) *Ca14-15 (378)
vero hia te vero te vero
Vero

To throw, to hurl (a lance, a spear). This word was also used with the particle kua preposed: koía kua vero i te matá, he is the one who threw the obsidian [weapon]. Verovero, to throw, to hurl repeatedly, quickly (iterative of vero). Vanaga.

1. Arrow, dart, harpoon, lance, spear, nail, to lacerate, to transpierce (veo). P Mgv.: vero, to dart, to throw a lance, the tail; verovero, ray, beam, tentacle. Mq.: veó, dart, lance, harpoon, tail, horn. Ta.: vero, dart, lance. 2. To turn over face down. 3. Ta.: verovero, to twinkle like the stars. Ha.: welowelo, the light of a firebrand thrown into the air. 4. Mq.: veo, tenth month of the lunar year. Ha.: welo, a month (about April). Churchill.

Sa.: velo, to cast a spear or dart, to spear. To.: velo, to dart. Fu.: velo, velosi, to lance. Uvea: velo, to cast; impulse, incitement. Niuē: velo, to throw a spear or dart. Ma.: wero, to stab, to pierce, to spear. Ta.: vero, to dart or throw a spear. Mg.: vero, to pierce, to lance. Mgv.: vero, to lance, to throw a spear. Mq.: veo, to lance, to throw a spear. Churchill 2.

WELO, v. Haw., to float or stream in the wind; to flutter or shake in the wind, s. the setting of the sun, or the appearance of it floating on the ocean; welo-welo, colours or cloth streaming in the wind, a tail, as of a kite, light streaming from a brand of fire thrown into the air in the dark; hoku-welo-welo, a comet, a meteor; ko-welo, to drag behind, as the trail of a garment, to stream, as a flag or pennant.

Sam., Tong., welo, to dart, cast a spear of dart.

Tah., wero, to dart, throw a spear; a storm, tempest, fig. great rage; wero-wero, to twinkle, as the stars. Marqu., weo, a tail. Mangar., wero, a lance, spear.

Greek, βαλλω, εβαλον, to throw, cast, hurl, of missiles, throw out, let fall, push forward; βελος, a missile, a dart; βελεμνον, id., βολη, a throw, a stroke; βολος, anything thrown, missile, javelin, a cast of the dice.

Sanskr., pal, to go, to move. To this Benfey refers the Lat. pello, Greek παλλω, O. H. Germ. fallan, A.-Sax. feallan. Liddell and Scott are silent on these connections ... (Fornander)

... 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.'

At a solstice everyone must stay still, following the example of the Sun, and not disturb the cosmic order.