Sankashtahara Ganapathi Vratam is the best and most effective among all types of worship done to Lord Ganesh. Specific day to do this Vrata is known to occur only once in approximately seven years. The occurrence is a rare combination and a simultaneous incidence of Magha masa, Krishna Paksha ( a fortnight before the new moon day), Chaturthi Tithi, Tuesday, and the time of Rising of the moon.
2. STORY ABOUT THE SAMKASHTAHARA GANAPATHI VRATA:
The significance of Sankashtahara Ganapathi Vrata is depicted in Ganesha Purana. Once king Kritavirya was suffering as he did not have a son and observed great penance. Knowing this, his father, who was in Pithruloka, in turn, worshiped Lord Brahma. Brahma blessed Kritavirya’s father with this Vrata is in the form of a book. Kritavirya got the knowledge of this Vrata through his father, who appeared in his dream. Kritavirya worshiped Sankashtahara Ganapathi in this Vrata Vidhana and got a son, who later became ‘Karthaviryarjuna the Great’. In another instance, King Surasena came to know the greatness of this Vrata from Lord Indra and did this Vrata. As a result of that worship, he was able to take all the people in his kingdom to Vinayaka loka along with him.