Aether

Aether (Αιθηρ), or Acmon (Ακμων), was the Greek primordial god of the upper atmosphere, the bright and blue sky of the heavens that only the gods lived within. Aether was the substance of the day and shone down upon the earth and caused day. When Nyx would drag the mists of Erebus across Aether, the light would be blocked and the night would spread across the earth. Hemera would then scatter these mists to bring back the day. Aether is typically said to be the son of Erebus and Nyx, although some sources have claimed him to be a child of Chaos or of Chronos and Ananke.

Aether consorted with his sister, Hemera, and they produced one child: Thalassa. Aether also had several children with Gaea, including: Dolus, Lyssa, Penthos, Poena, and Aergia.