Hemera and Aether are the parents of Uranus, Gaia, and Pontus in Hyginus's cosmogony, where Sky, Earth, and Sea spring from Day and Bright Air.
⚠ This genealogy follows Hyginus's Fabulae, which differs from Hesiod's Theogony where Gaia emerges independently from Chaos and Uranus is born from Gaia alone.
Nyx and Erebus, primordial Night and Darkness, lay together and bore Aether the bright upper air, Hemera the Day, and Charon the ferryman who carries the dead across the rivers of the underworld.
Hemera is sometimes conflated with Eos in ancient sources, but Hesiod distinguishes them: Eos is the Titan who heralds sunrise, while Hemera is the primordial personification of daylight itself. Pausanias (1.3.1) records that some identified the two.
Hemera and Nyx pass each other at the great bronze threshold beyond the gates of Tartarus — as one steps out into the world above, the other descends within, and the house never holds them both at once.
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