glyph numbers and days are counted from Ha1-4
Hb9-17	Hb9-18	Hb9-19	Hb9-20 (1077)	Hb9-21
358	359			360

3 (Ha1-1--3) + 1077 + 216 = 1296, which means that from moe in Hb9-21 there are 216 / 3 = 72 days to the end of side b. But there are 216 days both on side a and on side b. 216 days is equal to 3 * 72 days. We can therefore understand 1296 glyphs as equal to 6 * 72 days. 6 * 72 = 432 = 12 * 36 = 18 * 24 = 9 * 48 = 3 * 144 = 8 * 54 = 16 * 27.

Next, we should search for the effects of rau hei at Hb9-19. Given the pattern from G we can hope to find a tao glyph (or similar) 243 days later. 72 of those days are at the end of side b, which leaves 243 - 72 = 171 (= 9 * 19, cfr Hb9-19) days to the beginning of side a.

3 * 171 = 513 glyphs, and glyph number 513, counted from Ha1-1, is Ha10-11 - and indeed it is a tao glyph:

glyph numbers and day numbers are counted from Ha1-4
			216	510
Hb9-18	Hb9-19	Hb9-20 (1077)			Ha10-9	Ha10-10	Ha10-11 (510)
243					510 / 3 = 170

The honui glyph in Ha10-9 has a ragi head, possibly meaning it is the beginning of 'nighttime'. Which it ought to be because rau hei in Hb9-19 is a nighttime 'sacrifice' - there is room for a new one of the same general type. (The 'sacrifice' of Ulu produced primarily the breadfruit, ulu, I suppose, the other plants could be later additions.)