22nd September is the Ancient Egyptian Ritual of the Neteru of the Two Lands. The Two Lands, comprising of Upper & Lower Egypt, were presided over by the more successful Pharaohs. It is a the time of the equinox when light and dark are equal and could be said to come together.
Together they could be said to represent the higher and lower self of the human body, and as such would need to be integrated on an annual basis with the help of the Neteru (Deities or Angelic Beings).