1 2 3 4 5 6 7 8 9 10 11 12 13 14
8 4 7 3 2 3 4 2 2 2 3 2 4 3
8 12 19 22 24 27 31 33 35 37 40 42 46 49
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
5 3 6 7 5 8 5 4 3 5 2 2 3 3 3 4 6
54 57 63 70 75 83 88 92 95 100 102 104 107 110 113 117 123

Evidently the 'double-canoe' is placed in the middle period (no. 15), but the middle glyph is in period no. 17.

Is there a sign in the form of 6 glyphs in this period (no. 17) to indicate a relation to the 31st period which also has 6 glyphs? Only these two periods have 6 glyphs. And 6 could be a hint to make the reader think about 6 months (or double-months).

South of the equator there would be about 184 days for the first half year and 182 days for the second half year, i.e. the second half year is somewhat shorter than the first. 3 * 123 = 369 and 3 * 63 = 189. 369 - 189 = 180. Could we have done better than that with a total number of glyphs around 120?

If we can accept that they have constructed a good 'map of the solar year, then this means - I think - that glyph no. 64 belongs to the second half year, because that gives 60 glyphs until winter solstice, a beautiful number. Glyph no. 64 (I think) also shows that now starts a new period with 3 double-months: