As I remember it my impressions already from the beginning was that side a was the side of sun light, and side b the side of the night. (I refer to Tahua.)

When Metoro began his reading on side b instead of side a, I could accept that because light was not there (in cosmos) from the beginning.

I have now become convinced Metoro was right. With the (probably) mythological marker glyphs Aa4-18 and Aa6-66 we can guess the main parts of the cycle, and the two viri on side b says where the beginning is:

The length of the text and the exercises searching for kuhane stations later made me believe there were 2 glyphs for each day.

Now I have modified my view and would rather say that when the long cycle around both sides is interpreted the rule of 2 glyphs per day seems reasonable, but when tracing the shorter cycle around only side a one glyph per day could be the right way to read.

First, the discovery of ki uta ki te pito o te henua at position 290 (counted from Aa1-1) makes sense if we think of 10 months with 29 days in each - it could be the measure of a calendar where sun has reached his end at day 290:

88					196
	Aa1-89	Aa1-90	Aa2-1 (91)	Aa2-2		Aa4-38	Aa4-39 (290)

Then, another sequence of glyphs makes better sense with 1 glyph per day than 2:

		246					46
Aa2-1	Aa2-2		Aa5-4	Aa5-5	Aa5-6	Aa5-7				Aa5-56	Aa5-57)
day 46		123	day 170		day 171			23	day 195
125 days					25 days

390 - 90 (Aa1-1--90) = 300 seems to be the measure of the sun based on 10 months with 30 days in each:

		246					46
Aa2-1	Aa2-2		Aa5-4	Aa5-5	Aa5-6	Aa5-7		Aa5-56	Aa5-57
days 1-2			days 249-250		days 251-252			days 299-300
250 days					50 days

25 = 5 * 5 (at 250) indicates 'fire', which surely must be the sun.

If a calendar is beginning at Aa1-1 with day number 1, and if sun will leave at day 390, then there should be 30 days (counted from Aa1-1) which in some meaning belong to the previous year. Because 390 - 30 = 360.

Aa1-30 could be the last glyph of the previous year:

Aa1-24	Aa1-25	Aa1-26	Aa1-27	Aa1-28	Aa1-29	Aa1-30
Aa1-31	Aa1-32	Aa1-33	Aa1-34	Aa1-35	Aa1-36

There follow 6 more glyphs before the daylight calendar ends. 360 + 6 = 366. Flexibility is embedded.

The peculiar Aa1-35 can be explained by the two years meeting on day 365.

There are 670 glyphs on side a, and 390 have been (partially) explained. 670 - 390 = 280 = 10 months measured by nights when moon potentially is visible. But no obvious trace is found of such a structure:

24					60
	Aa5-82	Aa5-83 (26)	Aa6-1	Aa6-2		Aa6-63	Aa6-64 (90)

		128
Aa6-65	Aa6-66 (92)		Aa8-26	Aa8-27 (222)	Aa8-28	Aa8-29	Aa8-30 (225)	Aa8-31

52
	Aa8-84	Aa8-85 (280)