Shri Satyanarayan Puja is conducted to seek the blessings of Lord Narayan. It is performed every Purnima or Poornima also known as Pournami (full moon). Narayan is an incarnation of Lord Vishnu. When Shri Satyanarayan Puja / Satyanarayan Katha is organized, especially on a Poornima, it makes him happy enough to bless his devotees.
On the day of puja, devotees have to observe fast. Puja can be performed in the morning and in the evening. Evening Puja is more suitable for devotees as they can break their fast by obtaining Prasadam.
In mPanchang, dates for Satyanarayan Puja to be performed during evenings have been laid out in advance. The puja dates can fall on Chaturdashi, one day before Purnima, Poornima or Pournami. Those willing to perform Puja in the morning can also consult mPanchang to ascertain the accurate timings of the Pooja and ensure it is done within Purnima tithi as the tithi may sometimes get over in Morning. It is, therefore, advised to perform Shri Satyanarayan Puja Vidhi on the eve of puja day.