4. The corner at midsummer is easily understood, it is the point where Sun turns around from rising to descending. We have tentatively located it at tamaiti immediately beyond the end of the henua calendar:

Counted from Rogo in Gb6-26 day number 240 is ariki in the preceding glyph. I have suggested - via the star distances - that Gb6-26 represents Sirrah and day number 1:

present autumn equinox			present winter solstice			present spring equinox
Sirrah	1	-	Sirius	102	13	Spica (3)	204	24
Polaris (10)	28	27	Procyon (7)	116	14	Arcturus (6)	216	12
Alcyone	57	29	Alphard (5)	143	27	Toliman	222	6
Aldebaran (2)	69	12	Dubhe (4)	168	25	Antares (1)	250	28
Rigel	79	10	Phaed (9)	180	12
Alnilam	85	6
Betelgeuze (8)	89	4

Sirrah is at the border between 'water' and 'land' and the star pillars are standing 'on land'. In the sky roof 'land' is beginning with the square of Pegasus (diametrically opposed to Virgo and Spica). As if by chance day number 204 for Spica happens to be half 408:

Sirrah (?)
Gb6-25 (408)	Gb6-26 (*1)

In a corner there is one side at left (at the back) and another at right (in front), therefore it seems reasonable to show both glyphs. But in Ga5-30 the 'interregnum henua' probably indicates it is located in between the 'sides', with the side in front as the following Ga6-1 (cfr at A Pillar To Stand By):

257 - 142 = 115 = 230 / 2.

As a rule of thumb I have suggested (cfr at 57) that the front side should be ⅔ of the whole, which implies we ought to count 204 + 102 = 306 to find out where the cycle ends.

... Gilgamesh is claimed to have been one of the earliest kings of Uruk (or Erech). The circumstances of his fabled birth make him two-thirds god and one-third man, which makes him - in the sexagesimal system of Mesopotamia - two-thirds of 60 (= Anu) = 40, the number which characterized Enki-Ea, whence the latter's denomination of 'Shanabi (= ⅔, i.e., of 60) and Nimin (Sumerian = 40)' ...

This number leads us to Gb3-15 - in the center of the 30 glyph long moko line without any henua signs - where there is another version of Rogo and where 3-14 (a sign for π)  in the preceding glyph says a cycle is closed:

Gb3-12	Gb3-13	Gb3-14	Gb3-15 (306)	Gb3-16

It 'proves' my idea of only ⅓ for the back side. If we count to 306 from Gb6-26 we will arrive at glyph number 242 counted from Gb8-30:

Gb1-9	Gb1-10	Gb1-11	Gb1-12 (242)

There are 242 glyphs on side b.

205 at what presumably is the midsummer apex can be interpreted as 'one more' because 205 = 204 + 1:

Beyond a corner there should be a 'child' - because everything begins as a 'child' - and 5 glyphs beyond Sirrah, in position 'one more' than 14 * 29½ = 413, there is a tamaiti:

Gb6-25	Gb6-26	Gb6-27	Gb6-28

			58	180
Gb7-1	Gb7-2	Gb7-3 (414)			Ga7-11 (181)	Ga7-12	Ga7-13	Ga7-14
		240

Possibly the distance to next tamaiti was designed to underline there are 240 days on the front side. There appears to be a connection between the first and the second tamaiti because Saturn follows Venus and 3 + 4 = 7. This 'week' begins with Mercury and ends with Mars.

414 - 181 = 233, which number leads us to yet another Rogo, one without head:

Ga8-26	Gb1-1	Gb1-2	Gb1-3 (233)