The summary page:

The manu kake glyphs unquestionably are designed to indicate a Janus position. Such a position means to stand immediately inside the 'door' leading from the old year to the new, cfr January. One head of manu kake is looking back, the other forward. Examples: 296 Ga3-1 (61) Gb5-4 Gb5-5 Gb5-6 (360) 300 258 Ga4-21 (105) Gb5-10 (364) 260 Here the two manu kake glyphs in G help us to 'solve' the structure of the two basic years: 360 4 * 15 = 60 20 * 15 = 300 24 * 15 364 4 * 26 = 104 10 * 26 = 260 14 * 26 Other texts use manu kake glyphs in different ways, but - it seems - always with the idea of such a glyph being positioned inside the 'door' to a new year. This new 'year' is not necessarily defined by the sun, for instance is manu kake in Ab5-17 located at the beginning of the Venus synodic period: 1167 Ab5-17 Ab3-8 584 Each day is here represented by two glyphs.

In Ab5-17 maro hangs at right from the head of the forward bird and the head at bottom has rotated 180° from a vertical position where the 'eye' was in front. The bird at right looks thinner than the bird at left, and we can guess the bird at left should be the morning star.

With 584 days in front, shouldn't the morning star be the first face of Venus?

The Mayan 'make-up' has left the 8 black nights between evening and morning star as it is according to mother nature. 8 can never be wrong.

Therefore we can guess that Ab5-17 stands at the beginning of the morning star phase - there are 16 glyphs = 8 days before this manu kake:

Ab5-1	Ab5-2	Ab5-3	Ab5-4	Ab5-5
Ab5-6 (1000)	Ab5-7	Ab5-8	Ab5-9	Ab5-10
Ab5-11	Ab5-12	Ab5-13	Ab5-14	Ab5-15	Ab5-16

But we do not know which 'make-up' the rongorongo writers used. In G we have twice 236 glyphs, and adding 8 to that we get 480, which leaves 584 - 480 = 104 = 4 * 26 for the black phase between morning and evening star. 472 - 104 = 368, and it is the number of a 'π glyph' (ordinal number -14):

 

Gb5-5	Gb5-6	Gb5-7	Gb5-8	Gb5-9	Gb5-10
Gb5-11	Gb5-12	Gb5-13	Gb5-14 (368)	Gb5-15	Gb5-16

We should also investigate which glyph stands at position 236 * 2 = 472 beyond Ab5-17:

		322	146
Ab5-17	Ab5-18 (342)			Aa2-57	Aa2-58
1		161	73	1
236

Aa2-58 is indeed a great dark henua glyph, indicating a season could be over. Looking 5 days forward we find a peculiar hatchmarked henua glyph to be abruptly cutting off the sequence (with the second half of the day missing):

 

Aa2-53	Aa2-54	Aa2-55	Aa2-56	Aa2-57	Aa2-58 (148)

Aa2-59	Aa2-60	Aa2-61	Aa2-62	Aa2-63
Aa2-64	Aa2-65	Aa2-66	Aa2-67 (157)

236 + 4½ = 240½. Possibly day 240 is a limit for the sun. Aa2-66 could, though, allude to Gb2-10, where we have located Te Pou (Sirius) - 9 * 29.5 = 265.5:

 

Gb2-6	Gb2-7	Gb2-8	Gb2-9	Gb2-10 (266)	Gb2-11
Gb2-12	Gb2-13	Gb2-14	Gb2-15	Gb2-16	Gb2-17

There is a resemblance between Gb2-9 and Gb2-11 on one hand and Ab5-2 on the other:

 

Gb2-9	Gb2-11	Ab5-2

8 feathers on Gb2-9 could mean 8 dark days, which generate a light Venus season. Counting on Ab5-2 we have 3 feathers at right, equal to the number in Gb2-11, and at left there are 2 feathers + a moon crescent. If the moon crescent means 2, then there will be 4 at left in Ab5-2, equalt to 4 at left in Gb2-11.

Neither 236 nor 250 can be divided by 3.

Gb2-10 suggests a full moon and its location is important - 100 days before the end at 366. The phases of the moon are surely coordinated with the phases of Venus. Is not Te Pou the time for this coordination, and should it not be a full moon time?

73 days (e.g. from the beginning of side a to Aa2-57) is equal to 365 / 5, but it is also equal to 1 / 5 of the sky dome, and Venus describes a 'pentagon' in the sky. Therefore 73 could point to Venus.