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Assuming there are 31 days (= glyphs) in every month of summer, we must arrive at Gb1-11 after 5 months, not at Gb1-6:

Gb1-4 Gb1-5 Gb1-6 Gb1-7 Gb1-8
148 149 150 151 152
Gb1-9 Gb1-10 Gb1-11 Gb1-12
153 154 155 156

The flanking birds in Gb1-4 and Gb1-12 makes a symmetrical pattern together with Gb1-6 and the 155th glyph Gb1-11. These birds are marks to make us focus our attention.