To understand this glyph (Qb5-128) it is probably efficient to list 1a2 in a table:

1a2 H
1a2 P
1a2 Q

Evidently the 'hole' in H and P through which we may assume the sun to be born is not a 'hole' in Q. In my catalogue of glyphs (in GD24)  I have described the closed hole as a variant of the hole. It might be an egg.

H has a big oval as center of the sun, also a sign of an egg. I remember having noted this egg congruence between H and Q earlier, in the first period of the day.

En passent: The sun in Q has a sign in the form of a short straight line sloping slightly downwards and towards the right from the oval. (In Qa8-6 and Qa9-1 there are similar signs, though this time on both sides of the oval.)