Hemera
The primordial Day born from Nyx and Erebus, completing the passage from darkness to light with Aether.

Overview
Hemera is the personified Day in the Theogony, born with Aether from Nyx and Erebus. Her role is early and abstract: through her the poem says that after night and darkness the world has daylight and upper brightness. She is not primarily an actor in heroic adventures but a condition of time and light in Hesiod’s cosmogony. Placing Hemera in this family also keeps Night/Nyx, Darkness/Erebus and Day/Hemera distinct, so the primordial sequence can move from darkness and night toward upper brightness and visible day.
Key facts
Born with Aether
Hesiod pairs Hemera with Aether as children of Nyx and Erebus.
Day is not a duplicate Night
Nyx is Night; Hemera is Day born after Night and Darkness, so the poem gives them different genealogical positions.
Relationships
Ancient sources
MythWeave distinguishes ancient-source evidence from later adaptations and modern interpretation.