Hemera (Ἡμέρα) is the Greek word for "day." **The primordial Greek goddess of daylight** — daughter of Erebus (darkness) and Nyx (night), sister of Aether (upper air). In Hesiod's Theogony, she emerges from Tartarus as her mother returns each night.
Featured in Hesiod's Theogony.
Hemera reduces to one — the number of Greek day.