As in the calendar of the week it is evident that the calendar of the moon is describing facts for the watcher of the sky. The calendar contains much more than a simple enumeration of the days (or rather nights) of the month.

The way to describe the evolution of the 'face' of the moon in the calendar seems to be first to 'draw lines' horizontally and vertically to create a kind of grid with lines and columns. There are 8 suchs lines and 6 such columns, forming 8 * 6 = 48 'cells' to locate glyphs into. Though the 'cell' in the last column of each such line (or what I call 'period') does contain more than one glyph, by a number which varies over the periods. Also, in two instances, in periods nos. 4 and 6, the 'cell' for the shape of the moon is empty. The number of nights in each period I guess is registered by the number of canoe-like moon-signs oriented with 'bottom' to the left in the 6th column. The number of nights according to this assumption: