Among the 59 honu glyphs listed by me for Tahua I can identify 24 Rogo glyphs, 8 of which (redmarked) have legs (cannot be at a solstice):

Aa1-58 Aa1-80 Aa2-25 Aa3-67 Aa4-11 Aa4-13
Aa6-77 Aa7-50 Aa7-51 Aa7-69 Ab1-6 Ab1-45
Ab1-56 Ab1-68 Ab1-71 Ab2-62 Ab3-43 Ab5-53
Ab6-77 Ab6-82 Ab7-7 Ab7-25 Ab7-53 Ab8-62

After discarding those with legs and those which do not show both their mata, the rest are these:

Aa1-80 Aa3-67 Aa4-11 Aa7-50 Aa7-51 Ab1-6
Ab5-53 Ab6-82 Ab7-25 Ab7-53 Ab8-62

The three redmarked glyphs have holes, are 'empty', and cannot reasonably be at winter solstice. Therefore the end of side b is not at winter solstice, rather at the end of summer. This agrees with 300 days as a measure from winter solstice to Te Pei.

But side b must then be the 'front side' (which Metoro maybe understood because he began reading on side b). We should search for winter solstice where the 368 days are ending (close to Hanga Te Pau). Only Ab1-6 is possible:

glyph numbers are counted from Ab8-41
Aa8-85 Ab1-1 (716) Ab1-2 Ab1-3 Ab1-4 Ab1-5 Ab1-6 (721) Ab1-7
358 359 360 361

1-6 is the reverse of 61 (in 361), which could be a coincidence. Or not. 361 indicates 1 day beyond 360, a dark day, while 1-6 easily can be understood as 'the beginning of the first day of the recycled Rogo', a day of returning light.

Another, only slightly different, Rogo is at Aa3-67 (as if saying '1 more than 366'):

Aa3-53 Aa3-54 Aa3-55 Aa3-56 Aa3-57 Aa3-58 Aa3-59 Aa3-60
Aa3-61 Aa3-62 Aa3-63 Aa3-64 Aa3-65 Aa3-66 Aa3-67 Aa3-68 (288)

This Rogo is strongly supported by the glyph numbers. If both these Rogo glyphs are referring to winter solstice, then the solstice must stretch for at least 367 - 360 = 7 days:

718 12
Ab8-41 (1) Ab8-42 Ab1-6 (721) Ab1-7 Ab1-20 Ab1-21 (736)
day 1 359 361 6 736 / 2 = 368

Rogo at Ab1-6 has his bulbous body assymmetrically oriented towards right, Rogo at Aa3-67 towards left.

Mea ke at Aa3-68 'proves' two important things for us. First, that the hardly noticeable koti sign at right in pure (Ab1-7) is no coincidence, because a similar 'break' can be observed at left in Aa3-68. Mea ke means the maximum of darkness at winter solstice, but when the glyph is 'broken' it means these 'shadows' are broken. Light is returning.

Secondly, the ordinal number of Aa3-68 (scounted from Aa1-1) is equal to 36 * 8. This reinforces my suggestion of 1336 as the length of the Tahua text cycle: 13 * 36 = 468, and 46 * 8 = 368, and 36 * 8 = 288.