Tsukuyomi no Mikoto is the moon deity of Japanese mythology, born from Izanagi during his ritual purification, alongside siblings Amaterasu and Susanoo. Tsukuyomi governs the night and the moon's cycles, and is traditionally associated with the ebb and flow of tides and time. Devotees sometimes invoke Tsukuyomi in connection with endeavors requiring discipline and steady rhythm, such as sports and competition, though this connection rests more on folk association than on established scriptural mandate.