Probably it is significant that it is in the 29th period - the 29th night of the moon is completely dark, as if the moon had died.

Counting glyphs from Gb8-30 we will find Ga6-27 to be glyph number 168, a sign which determines that the preceding glyph was the last one in a cycle consisting of 167 glyphs.

Rau hei in Ga6-25 confirms our interpretation - it shows a 'dead fish' hanging head down.