A year with 400 days is a concept which apparently can be used in order to interpret maro in Ga5-15. The 400th glyph in the text - counted from Gb8-30 - is Gb6-17 and it seems to serve the function of identifying a point from which to start counting anew (cfr Cb6-25--26):
The redmarked glyphs lie 73, 64, respectively 59 days from the end of side b. If we add 73 to 126 the ordinal number for Ga5-15 will be 199:
Evidence points at Gb6-17 as the correct point from which to count the ordinal numbers (day numbers) for the glyphs in the 'henua periods'. This means we presumably should regard maro in Ga5-15 primarily as a sign which identifies the midpoint of this 400 day long year. Or to be more accurate, it is the last glyph before the end of the first half of these 400 days - a period with an even number of days must have two glyphs in its middle:
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