“Dhanur maasam” starts in mRgasira bahulam. When sun is in Dhanu raasi , Vaishnavaites do this vratham for 30 days. Everyday, early in the morning people worship Vishnu. In this month, purnima comes with pushyami star. Aandaal puja is also important to people.
From this day, Lord Vishnu is worshipped for four days.