The Greek goddess of bright day, daughter of goddess of night Nykta and god of darkness Erebus, Hemera, meaning 'day' in Greek, gives rise to the word "ephemeris". (M 41937)Springer Berlin HeidelbergDictionary of Minor Planet Names
In Greek mythology Hemera (Greek: Ἡμέρα, "day") was the personification of day and one of the Protogenoi or primordial deities. She is the goddess of the daytime and, according to Hesiod, the daughter of Erebos and Nyx (the goddess of night). Hemera is remarked upon in Cicero...