209 is 13 * 16 + 1 and based on the structure in the cycle of the moon. In the 16th night growing moon is 'finished'. Likewise 13 alludes to the fact that after 13 * 28 = 364 nights the year is ending. Mother nature has informed us by establishing a year which is 'finished' in the 365th night (= 13 * 28 + 1).

1 is the beginning of counting and can also used to symbolize a beginning in general. The structure in G can therefore be read with Ga1-26 as 'birth' of one season and with Gb1-6 as 'birth' of another season:

208 261
Ga1-26 Gb1-6
1 1

At Ga1-26 is the navel (pito) - we can guess - from which the 1st half of the year will grow and at Gb1-6 is the navel from which the 2nd half of the year will grow. The 1st half measures 8 times 26, while the 2nd half measures 10 times 26, together 18 * 26 = 468 glyhs. Plus Ga1-26 + Gb1-6 + one more glyph among those 261.

With the 1st half of the year 'being born' at Ga1-26 high summer will be illustrated in Gb1-5 as a fully grown and standing tagata:

102 102
Ga1-26 Ga5-19 Ga5-20 Gb1-4 Gb1-5 Gb1-6
208 = 8 * 26

Mauga in Ga5-19 can mark the end of the 1st calendar quarter. It stands at the center of the 19th period and also has ordinal number 19:

19
Ga5-17 Ga5-18 Ga5-19 Ga5-20 Ga5-21
102 103 104 105 106
520

Adding the 5 glyphs in period 19 (as alluded to in 5-19) we reach 520 = 20 * 26.