Parsva Ekadasi occurs in the month of Asvina when the Moon is waxing, and is also known as Vamana Ekadasi. In the Brahma-vaivarta Purana, Sri Krsna and Maharaja Yudhistira discuss the illimatable glories of this special day.Maharaja Yudhistira asked Sri Krsna "What is the name of the Ekadasi that takes place during the waxing moon in the month of Asvina? How should one make a proper job of observing this Ekadasi vrata and what merit is to be obtained by it? Please explain to me all these in details."
Lord Vamanadeva appeared within this world from the womb of Aditi, the mother of the gods. He appeared at midday on the shravan-dvadasi, the 12th day of the lunar month of Shravan when the moon is waxing. There are many lessons for Vaishnavas to learn from the narration of His activities, as found in the 8th canto, 18th chapter of the Bhagavat Purana (Srimad Bhagavatam). Amongst the lessons are these: