From *Hb1-23 the glyphs of the 'back side' are gradually appearing:

...
*Hb1-22 *Hb1-23 *Hb1-24 *Hb1-25 *Hb1-26 *Hb1-27
670 671 672 673 674 675
688 689 690 691 692 693
224 (230) 225 (231)

The first fully visible glyph is a strong sign, and it coincides with the beginning of a new day and also with the beginning of a new week if we think Mars ought to bring the new light also in the week:

*Hb1-28 *Hb1-29 *Hb1-30 *Hb1-31 *Hb1-32 *Hb1-33 *Hb1-34
676 677 678 679 680 681 682
694 695 696 697 698 699 700
*Hb1-35 *Hb1-36 *Hb1-37 *Hb1-38 *Hb1-39 *Hb1-40 *Hb1-41
683 684 685 686 687 688 689
701 702 703 704 705 706 707
*Hb1-42 *Hb1-43 *Hb1-44 *Hb1-45 *Hb1-46 *Hb1-47 *Hb1-48
690 691 692 693 694 695 696
708 709 710 711 712 713 714
*Hb1-49 *Hb1-50 *Hb1-51 Hb2-1
697 698 699
715 716 717

The sequence of weeks is broken at the end of the line. And 7 is not a multiple of 3, which means the division by 3 in order to reach day numbers is following another logic.

The last glyph in line Hb1 can either be regarded as ending day number 699 / 3 = 233 or as ending day number 717 / 3 = 239. In the latter case the important reversal between day number 236 and 237 is described thus:

*Hb1-40 *Hb1-41 *Hb1-42 *Hb1-43 *Hb1-44 *Hb1-45
688 689 690 691 692 693
706 707 708 709 710 711
230 (236) 231 (237)