In India, Thursday is recalled as Brihaspatiwar or Vrihaspativar. It is a day dedicated to Lord Vishnu and Brihaspati, who was the Guru of Devas. In accordance to very story, for the ones performing Puja and Vrat on Thursday is the key to get blessed with wealth and good health. However one who does Brihaspati Puja Udyapan is of great importance as per the Hindu mythology.
Basically Brihaspati Puja Udyapan is considered as a celebration of thanks giving to God. It is the also a Thanking day for God to allow one to perform Brihaspati Puja for the number of days required. Also it a concluding ceremony after the completion of the Brihaspati fast in accordance to the advices Pandits or Priests for around 7 days, 9 days, 16 days, 45 days 52 days 108 days or Janma Vrat etc. After completing the fast for specific number of Thursday, one performs Udyapan. One can process this Vrat for minimum 7 Thursdays and maximum of 108 Thursdays. If someone is doing Sanma Vrat then it is a procedure of Thursday fasts for lifetime.
Method of Brihaspati Puja Udyapan: