The evidence we have examined by comparisons between G and H indicates that the strange glyph Gb1-21 very well might represent Venus:

Gb1-21

From such a perspective the two ovals hanging down of course must be the morning (right and higher) and evening (left and lower) 'stars'. And at bottom there is a similar division without any ovals, which ought to be the two periods when Venus is invisible.

If Gb1-21 represents Venus, then we can expect a coordination with the cycles of the moon, and there is a fortnight from the turnaround at Gb1-7 (with ordinal number 8 * 29.5 + 1, counted from Gb8-30): 

	13
Gb1-7		Gb1-21
14