Kb4-5 has ordinal number 5, and period 27 is together with period 29 the only periods in the 2nd calendar with 5 glyphs. Number 5 suggests 'fire' (by way of the number of fingers on a hand). Rima means both 5 and hand.

27
	Kb4-1	Kb4-2	Kb4-3	Kb4-4	Kb4-5
28
	Kb4-6	Kb4-7	Kb4-8	Kb4-9
29
	Kb4-10	Kb4-11	Kb4-12	Kb4-13	Kb4-14
30
	Kb4-15	Kb4-16	Kb4-17	Kb4-18

5 is also the difference between 365 and 360, and from the darkest 5 days at the end of the old year somehow a new 'sun' will emerge. The 5 internal markings in Kb4-8 could indicate these 5 days.

In the 1st calendar there are 5 glyphs between Ka3-7 and the 'fire generators':

Ka3-7	Ka3-8	Ka3-9	Ka3-10	Ka3-11	Ka3-12	Ka3-13	Ka3-14
	5 glyphs