The last page (in the glyph dictionary) about viri in Tahua:

1000 is a full measure, similar to 29. 100 between viri at Ab7-26 and pito at Ab8-43 carries the same meaning of finality. At the end we return to the beginning.

The glyph without 'eyes' (viri) must suggest both an end and a new beginning. Maybe the missing part at right in the middle of the viri glyphs is the navel (pito) of the double cycle - without the vacancy for the navel it would be a figure 8.

"... Vi.: virikoro, a circle around the moon. There is a complete accord from Efaté through Viti to Polynesia in the main use of this stem and in the particular use which is set to itself apart. In Efaté koro answers equally well for fence and for halo. In the marked advance which characterizes social life in Viti and among the Maori the need has been felt of qualifying koro in some distinctive manner when its reference is celestial. In Viti virimbai has the meaning of putting up a fence (mbai fence); viri does not appear independently in this use, but it is undoubtedly homogenetic with Samoan vili, which has a basic meaning of going around; virikoro then signifies the ring-fence-that-goes-around, sc. the moon ..." (Churchill 2)

I guess the double-month period necessary to reach a sense of order in the moon cycles (cfr 59 between Aa8-26 and Ab1-1) could be expressed by a symbol for 60 (the natural sun period) minus a little part. If there were a glyph like 8 in the rongorongo system it would then mean 60. Two moon cycles are like twins grown together. What we see in a viri glyph could be the two cycles for the visible moon - the dark moon nights are not seen.

On the other hand, the viri glyph type is not drawn with a thin middle at left - which ought to be the case if the upper half was another month than the bottom half. The 8 periods - with twice 36 glyphs - in the moon calendar of Mamari suggest another possibility, viz. that viri is drawn to depict the two phases of one moon: two cycles connected at one point but disjunct at the opposite point (the new moon phase). I do not suggest viri means a month, I suggest viri may mean a 'greater month' period. With 28 as 4 weeks there will be 8 weeks in two months. 59 - 56 = 3 nights are 'black'. Next larger double cycle is 16 weeks in 4 months: 118 - 112 = 6.

There are only 4 viri glyphs in the Tahua text, which suggests 16 weeks is a better measure than 4. 16 is also in harmony with a 16-night final for the growing moon.

The pito glyph Ab8-43 ties together the 4 viri glyphs with the center at Aa4-70--71:

	100		361
Ab7-26		Ab8-43		Aa4-70
464 = 16 * 29

Ab7-26 has a distance of 100 to Ab8-43 and Ab7-26 is part of the viri system, in which Ab1-1 is central:

Can this structure then be tied together with the 314-glyph structure?

Ab8-59 has a final sense, both in its numbers 8 (like 60) and 59 and its 'sails' at left. It is only 16 glyphs after 'te pito':

	100		15		345
Ab7-26		Ab8-43		Ab8-59		Aa4-70
464 = 16 * 29

Ab8-40	Ab8-41	Ab8-42	Ab8-43	Ab8-44	Ab8-45	Ab8-46
Ab8-47	Ab8-48	Ab8-49	Ab8-50	Ab8-51	Ab8-52	Ab8-53
Ab8-54	Ab8-55	Ab8-56	Ab8-57	Ab8-58	Ab8-59	Ab8-60

When the 'sails' are at left (Ab8-59) the wind blows from the right. The 'mast' (Ab8-60) must bend to the left.

The fish in Ab8-57 has its 'sail' to the right (in harmony with its rising phase), while henua ora in Ab8-52 has its 'sail' at left. Twisting henua ora around 180º will turn the 'sail' into the right side and it will become a 'rising fish'. At winter solstice the sun turns around.