The shape of the tail fin is a sign which unites Ga7-16 with the two preceding mago glyphs on side a:

44		37		102		286
	Ga2-14 (45)		Ga3-23 (83)		Ga7-16 (186)
186

Counting reveals a structure where 44 glyphs (including Gb8-30) come at the beginning and 44 (= 230 - 186) at the end of side a. The central portion which the three mago above measure out on side a apparently is 186 - 44 = 142 days long.

And fact is that 286 = 186 + 100 (i.e., 472 = 186 + 286).

This 'objective' description is not truly objective though, because by changing focus and perspective other descriptions equally valid will be found.