Our point of departure for this investigation is the fact that the last three toa glyphs in the Tahua night calendar are shorter than the other:

Aa1-37	Aa1-38	Aa1-39	Aa1-40	Aa1-41
Aa1-42	Aa1-43	Aa1-44	Aa1-45
Aa1-46	Aa1-47	Aa1-48

Toa in Aa1-47--48 are bulging slightly to the right, but in Aa1-46 the bulge is at left and the 'person' in Aa1-46 is looking back, which I interpret as a sign for the last glyph in a sequence.

Aa1-47--48 therefore should stand at the beginning of a new sequence of glyhps, a new period. It presumably means that the new day takes its beginning already with Aa1-47, not with the first glyph of the daylight calendar.