We have two firm points to stand on, the beginning of summer at Ga4-3 and the central point at Gb1-6:

summer		148		128
	Ga4-3		Gb1-6		Gb5-11	Gb5-12
	86		235		364	1
	1		150		279

150 is a number which suggests there are 5 months with 30 days in each from Ga4-3 up to and including Gb1-6.

On the other hand 279 = 9 * 31, seemingly to tell us that a month has 31 days (not 30). This paradox will now be explained.