Ananta Bhagwaan’s puja is done on this day. People observe fast the whole day. They cant eat salty food it means they take food without salt. It is believed that if it falls on Purnima tithi then its of much importance.
After taking bath take Sankalp for Fast.
Clean the place where puja is to be performed. Put Kalash (Pot) there and do its puja. After that put Lord Vishnu’s Idol on that pot and put Chaudah Granthiyukta Ananta Stura (Dora) [Thread] infront of the idol.After that recite ‘ॐ अनन्ताय नमः’ (Aum Anantaya Namaha) and do Lord Vishnu’s puja along with Ananta Sutra. And after this Men tie that Ananta Sutra on their right hand’s wrist and Women on their left hand’s wrist. While tieing it recite this mantra :
अनन्तसंसारमहासमुद्रे मग्नान् समभ्युद्धर वासुदेव ।
अनन्तरुपे विनियोजितात्मा ह्यनन्तरुपाय नमो नमस्ते ॥
After tieing it give some food to Brahman and then take yourself and should recite Bhagwaan Narayan’s name, songs and Bhajans the whole day. After completing the puja hear its Vrat katha with all the members of your family.