The correct Greek spelling would be Hêmerê and means day. She has other names like Amar or Dies which both of them mean Day. Hemera left Tartarus just as Nyx entered it when Hemera returned, Nyx left. A map of Nyx Mons on Venus can be viewed at Map of Nyx Mons – V9 Quad – Bell Regio (1.1 Megabyte).She was the female counterpart of her brother and consort, Aether (Light), but neither of them figured actively in myth or cult.

The feature possesses a diameter of 875 km, and is attributed to Nyx. Nyx Mons is located at 30 degrees north latitude, and 48.5 degrees longitude on the Venusian surface. In 1997, the International Astronomical Union approved the name Nyx for a mons (mountain/peak) feature on the planet Venus. The name was spelled with an 'i' instead of a 'y', to avoid conflict with the asteroid 3908 Nyx. On June 21, 2006, the International Astronomical Union renamed one of Pluto's recently discovered moons (S/2005 P 2) to Nix, in honor of Nyx. Cult titles composed of compounds of nyx- are attested for several gods, most notably Dionysus Nyktelios 'nocturnal' and Aphrodite Philopannyx 'who loves the whole night'. The Spartans had a cult of Sleep and Death, conceived of as twins. Thus there was a statue called 'Nyx' in the Temple of Artemis at Ephesus. More often, Nyx lurks in the background of other cults. According to Pausanias, she had an oracle on the acropolis at Megara. In Greece, Nyx is only rarely the focus of cults. The text implied that Hemera was not the sister of Aether, but the sister of Nyx's reincarnation. But she gave birth to twins, having a daughter as well, who was named Hemera, 'Day'. There is also rumor that Nyx gave birth to her reincarnation, a son whose name would also be Nyx. The classical scholar Walter Burkert has speculated that the house of the goddess to which the philosopher is transported is the palace of Nyx this hypothesis, however, must remain tentative. The theme of Nyx's cave or mansion, beyond the ocean (as in Hesiod) or somewhere at the edge of the cosmos (as in later Orphism) may be echoed in the philosophical poem of Parmenides. In other texts she may be the mother of Charon (with Erebus), and Phthonus 'envy' (with Dionysus). Nyx is also the first principle in the opening chorus of Aristophanes' Birds, which may be Orphic in inspiration. Phanes – the strange, monstrous, hermaphrodite Orphic demiurge – was the child or father of Nyx. Outside the cave, Adrasteia clashes cymbals and beats upon her tympanon, moving the entire universe in an ecstatic dance to the rhythm of Nyx's chanting. Cronus – who is chained within, asleep and drunk on honey – dreams and prophesies. Nyx occupies a cave or adyton, in which she gives oracles. In them, Nyx, rather than Chaos, is the first principle. Nyx took on an even more important role in several fragmentary poems attributed to Orpheus. He disturbed Zeus only a few times after that always fearing Zeus and running back to his mother Nyx, who would have confronted Zeus with a maternal fury. Hypnos goes on to say that Zeus, fearing to anger Nyx, held his fury at bay, and in this way Hypnos escaped the wrath of Zeus. Zeus was furious and would have smitten Hypnos into the sea if he had not fled to Nyx, his mother, in fear.

He had once before put Zeus to sleep at the bidding of Hera, allowing her to cause Heracles (who was returning by sea from Laomedon's Troy) great misfortune. In Book 14 of Homer's Iliad, there is a quote by Hypnos, the minor god of sleep, in which he reminds Hera of an old favor after she asks him to put Zeus to sleep. This mirrors the portrayal of Ratri (night) in the Rigveda, where she works in close cooperation but also tension with her sister Ushas (dawn). In his description of Tartarus, Hesiod says further that Hemera (day), who is Nyx's daughter, left Tartarus just as Nyx entered it when Hemera returned, Nyx left. Later, on her own, Nyx gives birth to Momus (blame), Moros (doom), Thanatos (death), Hypnos (sleep), Charon (the ferryman of Hades), the Oneiroi (dreams), the Hesperides, the Keres and Moirae (Fates), Nemesis (retribution), Apate (deception), Philotes (friendship), Geras (age), and Eris (strife). With Erebus the deity of shadow and darkness, Nyx gives birth to Aether (atmosphere) and Hemera (day). In Hesiod's Theogony, Nyx is born of Chaos her offspring are many, and telling. 2.2 Astronomy and planetary nomenclature.

Nyx and hemera