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Fortuna Huiusce Diei was an aspect of the goddess Fortuna, known primarily for her temple in the Area Sacra di Largo Argentina at Rome. Cicero lists her among the deities who should be cultivated in his ideal state, because "she empowers each day". She thus embodies an important aspect of time as it figures in Roman religion: every day of the year had a distinct and potent nature, which the public priests were responsible for knowing and aligning the community with by means of the religious calendar.