The numbers in the top line are the period numbers (totally 24 in this calendar, probably covering a year - one period for half a month):

1			55	11	48	19
	17
Eb1-37		Eb2-13		Eb4-4		Eb5-11
1		19		75		124

The numbers in the bottom line are the ordinal numbers counted from the beginning of the calendar. The numbers inserted between the glyphs are the number of glyphs in the interval between the glyphs.

Eb4-4 is not located at the midpoint of the calendar (with a total of 167 glyphs), which otherwise could have been a natural choice if it marked summer solstice (= winter solstice north of the equator).