Observed on Paurṇamāsī tithi of Kārtika (lunar) month. Perform snana four ghatikas before sunrise (during aruNodayam, when the Moon is still up, on the full-moon days of ASADha, kArtika, mAgha and vaizAkha – hence the name A-kA-mA-vai) bestows strength, beauty, fame, dharma, knowledge, happiness, fortitude and health.