3. But I will not pursue this train of thought any further for the moment. Instead I wish to point at the fact that the story of Perseus begins with the Queen of King Cepheus who behaved badly and therefore enraged the powers of the 'water'. Cassiopeia was at the beginning of the events and her daughter had to be chained to the rock at the margin of the sea:

The story seems to tell about how winter (with its 'water') was defeated by summer, because the back side of the head of Andromeda is connected to the old winter year. Spring equinox is where her neck is and her head coincides with the 4th corner of the square of Pegasus.

Her left arm is evidently of importance too, and the tips of 3 of her fingers are positioned exactly between Sirrah (α Andromedae) and Algenib (γ Pegasi). Similarly the end of her lower chain is drawn to be exactly between Sirrah and Scheat (β Pegasi).

Perseus is a player in the story not only by cause of his role in liberating Andromeda but also by cause of α Persei. Some connection between this star and ζ Andromedae (at her elbow) is probable.

"Another name [than Algenib for α Persei] Marfak or Mirfak, the Elbow, sometimes written Mirzac, comes from the Arabians' Marfik al Thurayya, thus qualified as being next to the Pleiades to distinguish it from the other elbow." (Allen)

Although I have no name for ζ Andromedae I know its distance from Sirrah (10 days) and also its distance to α Persei (40 days):

An 'elbow' in time is a place where the orientation of the 'arm' is changing. The meaning in Gb7-8--9 could be to illustrate how Sun in spring is released from the prison of winter. With the other 'elbow' stars, 10 days earlier respectively 40 days later, similar events could take place: