In Greek mythology, Hyperion is one of the twelve Titans, son of Uranus and Gaia, and by his sister-wife Theia the father of Helios (Sun), Selene (Moon), and Eos (Dawn). He is a personification of heavenly light and, in early poetry, sometimes overlaps with Helios himself. This atlas entry is the Titan — not Saturn's moon Hyperion, not the sun as a physical body, and not the separate Trojan prince of the same name.
Adapted from Wikipedia, "Hyperion (Titan)" · CC BY-SA 4.0
I.Family and role
Hyperion belongs to the elder Titan generation. Hesiod and Apollodorus make Theia (sometimes called Euryphaëssa) his consort and name their children Helios, Selene, and Eos — the three lights of the sky. As with many Titans, he has little independent narrative beyond genealogy: he exists chiefly as father of those celestial deities and as a member of the generation overthrown in the Titanomachy.
Early epic sometimes treats Hyperion and Helios as distinct (father and son) and sometimes identifies them, calling the sun "Helios Hyperion" or simply "Hyperion." Later literature usually keeps them separate and refers to the sun as Hyperion's bright son.
II.Later rationalizations and namesakes
Diodorus Siculus euhemerizes Hyperion as the first observer of the motions of sun, moon, and seasons, and therefore metaphorically their "father." He also records an unorthodox tale in which Hyperion and Basileia have Helios and Selene, who are killed by envious brothers and become the sun and moon.
Myth also knows a Trojan Hyperion among Priam's sons — a different figure. In modern astronomy, one of Saturn's irregular moons was named Hyperion after the Titan; Keats's unfinished epic Hyperion is among later literary uses. Neither the moon nor the poem is this character node.