Time, place, and the rhythm of the seasons, essential constituents of ancient ritual, collaboratively shaped and channeled the experience of religious performance. Focusing on agricultural and civic time reckoning, this article investigates the orientations of the monuments at the extra-mural Sanctuary of the Thirteen Altars at Lavinium and their coordination with viticultural activities amid the shifting social and religious circumstances of the 6th and 5th c. BCE. The article will argue that the 6th- and 5th-c. altars were aligned in such a way as to face sunrise at a particular location on the horizon on two very particular days in the seasonal year. The altars at Lavinium, playing an important role in the emerging urban community's economic life, will be shown to be themselves a form of agentic seasonal timekeeping that closely determined the integration of local agricultural, religious, and economic practices.
