Suggestion:

This type of glyph does indicate the dark phase(s). I have found a text in the tablet Aruku Kurenga which probably refers to similar matters:

Bb7-24 Bb7-25 Bb7-26 Bb7-27 Bb7-28 Bb7-29 Bb7-30 Bb7-31

The first glyph is some sort of introduction and then follows 7 glyphs which perhaps has to do with the week. If this is so, then maybe Bb7-26 shows the dark phase of the moon? And in Bb7-28 we recognize the type of glyph which belong in Wednesday, while Venus (Bb7-30) is given twice 5 points. Saturday has an (old?) man sitting down, still holding the stick.

The running figure for a 'planet', perhaps also may be applied to the sun. After all both Sun and Moon are included in the week, in spite of their special qualities. But what does the 'maunga'-glyph in Sunday mean? And why is it like a cracked egg on top?