Maitaki in Ga5-13 and honu in Ga5-14 are located in period 18 (while in K the long period 16 still persists):

Ga5-10 (121) Ga5-11 Ga5-12 Ga5-13 Ga5-14 Ga5-15 (126) Ga5-16
... ...
Kb1-12 Kb1-13 Kb1-14 Kb1-15 Kb1-16 *Kb1-17 *Kb1-18 *Kb1-19

In the maro chapter it was suggested that maro in Ga5-15 was located around summer solstice. Rogo at left in Ga5-10 is number 121 + 59 = 180 counted from tamaiti in Gb7-14 and maro is number 73 + 126 = 199 counted from tagata in Gb6-17:

72
Gb6-17 (400) Ga5-15 (126) Ga5-16
200

The parallel K text has just turned from side a to side b and in G period number 18 alludes to 10 * 18 = 180.