A new analysis of the symbolism of the swan arch of Staines suggests its meaning may be related to the Egyptian ‘Primordial Scission’ which tells the story of the first stages of creation in sacred geometry terms.
The sun is the contents of the invisible egg that is everything and nothing at the same time and is broken by the scission from the crossed blades that form the vesica piscis with their shadow. It is from the vesica piscis that all life comes from.
This is a variation on the Primordial Scission creation story. The event occurs at sunset and facing west whereas the Goddess of the Dawn, Eos, Ostara, Eastre, Easter rises in the East.
In Greek mythology, Astraeus was an astrological deity and the Titan-god of the dusk. He married Eos. Hespara was the Greek goddess of dusk.
That Easter was originally the festival of the Spring Equinox may explain one of the reasons why eggs are associated with Easter. Because an egg contains a sun, or soul, or sol within it as potential and the Spring Equinox dawn celebrations mark the time of year when days or deus or dios are of equal length as nights. The anticipation of spring and the gradual lengthening of daylight hours is also a part of this astro-theological resurrection ritual.