To be more precise, the shark figure (mago), redmarked below, indicates the arrival of sun and the beginning of summer:

		6
Ka3-1	Ka3-2		Ka4-13	Ka4-14	Ka4-15

Ka3-2 could be a determinative sign for the preceding 'sun fish'. Mago could then presumably reappear in the 6th period of the calendar as a determinative sign for the preceding hau glyph, where the calendar cycle is illustrated as 2 + 3 + 4 = 9 'feathers'. The cycle is preceded by 5 outside 'feathers', possibly implying the 365 - 360 = 5 days outside the regular calendar cycle. At the end of the regular cycle (right bottom in Ka4-13) the perimeter of the glyph is broken, a sign of sun's 'death' (or 'absence') beyond the 9th period (9 * 20 = 180 days).

There are 21 glyphs in line Ka3 and the 1st period of the calendar terminates the line:

1
	Ka3-15	Ka3-16	Ka3-17	Ka3-18	Ka3-19	Ka3-20	Ka3-21

21 (= 42 / 2) is also the number of Ka4-14 counting from the beginning of the calendar. The waxing phase of the moon ends with the 14th night, and 15 therefore suggests the full moon. Mago, the voracious shark could symbolize eating and growing, the phase up to midsummer.

Counting 7 additional glyps, to Ka5-5, we find that midsummer apparently just has passed:

7			8			9
	Ka4-16	Ka5-1		Ka5-2	Ka5-3		Ka5-4	Ka5-5

Ka4-16 is the last glyph of 'eating', i.e. the last of the glyphs which are 'shark-like'.