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From myth to science

Myth explanation:

Cassiopeia is the mother of Andromeda and the wife of Cepheus, king of Ethiopia. Cassiopeia was so proud of her beauty that, to rival the Nereids, they asked Poseidon, god of the seas, for revenge and he in response sent the sea monster (Cetus) to the shores of the country causing great evils.
To face this situation, Cepheus consulted the oracle of Amun, who advised sacrificing his daughter Andromeda exposing her tied to a rock on the cliff to be a victim of the monster. Thus, Andromeda was offered to Cetus. Perseus, who was coming back from his journey after defeating Medusa, saved Andromeda and fell in love with her.
Perseus proposed to Cepheus to free her, in exchange for marrying her. Perseus kills the monster and later marries Andromeda.
Cepheus, Andromeda's father, was cataloged at the will of Athena.

myth