The appearance of Venus as morning and evening star inspired one of Slavic mythology's most enduring traditions—the divine Zorya sisters who guard the boundaries between night and day. These celestial guardians open the gates for the sun's daily journey at dawn and secure them at dusk, their vigilance maintaining cosmic order against the forces of chaos. From battlefields where warriors invoked their protection to hearths where families sought their blessing, the Zorya shaped daily life across the Slavic world for centuries. Their veneration survived Christian conversion through strategic syncretism, persisted in folk tales despite official suppression, and continues today among those reclaiming ancestral traditions. The astronomical phenomenon behind their myth—Venus rising and setting—remains observable in our skies, connecting modern observers to the same celestial patterns our ancestors personified. This exploration of the Zorya tradition reveals how astronomical observation evolved into a complex mythological system that connected ordinary people to cosmic order. Through examining their Indo-European origins, regional variations, ritual functions, and cultural adaptations, we gain insight into how these stellar goddesses helped generations of Slavic peoples navigate both the physical world and the metaphysical boundaries that structure human experience.