I have now created the item for GD31 in my glyph dictionary.

 

So back to the initial question: What does this glyph

 

mean? Possibly the right part is expressing that light is emanating from the left part.

 

And the left part is somebody or something dead, I suppose. The whole sentence is:

 

 

6 glyphs (sun) with new light in the middle?

 

Dividing the year by 3 gives 120 'nights'. Is the middle period the 4 months around winter solstice? That period starts at about the 21st of November and ends about the 21st of February (north of the equator). South of the equator it will be from about 21st of May to 21st of August. And this period will arrive one month after autumn equinox (irrespective of latitude). This idea fits with Kb3-5.