But the number of glyphs on each side are equal (3 * 216 = 648), and therefore the sun calendar (366 days) will have 178 days on side a and 184 on side b.

Quite possibly 178 on side a indicates that the summer 'half' of the year south of the equator is shorter than the winter 'half'.

The redmarked 66 days lie in the center of the calendar, with one 'leg' (cfr Pachamama) in 'summer' and one in 'winter'.

38 * 3 = 114 = 4 * 28.5 and 28 * 3 = 84 or 3 months counted half a day shorter than the 4 months on side a.