If we take Eb4-4 to be a midpoint (still guessing the glyph is marking summer solstice), then we should continue to glyph number 150 to see if we can find any confirmation of the midpoint:

1		55	11	48	19	25	24	16	24
18
	Eb2-13		Eb4-4		Eb5-11		Eb6-2		Eb6-19
	19		75		124		150		167

The sign of maro (at right in Eb6-2) is promising. It means 'final' and the word occurs e.g. in He Maro the last month of the year (June).

Taking a closer look at the glyphs around Eb6-2 we find what evidently is a description of the end of the year:

Eb5-35	Eb6-1	Eb6-2	Eb6-3	Eb6-4	Eb6-5
148	149	150	0	1	2

Eb6-1 probably pictures the emptiness (in the calendar) between the end of one calendar year and the next, between the old 'king' and the new one.

New light appears in Eb6-3, which we recognize from the K calendar, where Ka3-15 is the 1st glyph in the 1st period of the new year:

Ka3-14	Ka3-15	Ka3-16
0	1	2