Appropriately, as god of the dusk, Astraeus married Eos, goddess of the dawn. Together as nightfall and daybreak they produced many children who are associated with what occurs in the sky during twilight.
^Cicero wrote: Stella Veneris, quae Φωσφόρος Graece, Latine dicitur Lucifer, cum antegreditur solem, cum subsequitur autem Hesperos; The star of Venus, called Φωσφόρος in Greek and Lucifer in Latin when it precedes, Hesperos when it follows the sun – De Natura Deorum 2, 20, 53. Pliny the Elder: Sidus appellatum Veneris … ante matutinum exoriens Luciferi nomen accipit … contra ab occasu refulgens nuncupatur Vesper (The star called Venus … when it rises in the morning is given the name Lucifer … but when it shines at sunset it is called Vesper) Natural History 2, 36
^Barney, Stephen et al., transl., ed. (2010). The Etymologies of Isidore of Seville. Cambridge U. Press. p. 105.CS1 maint: extra text: authors list (link)