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.
3. Sankatahara Ganapathi:-
Lord Ganapathi worshiped in this form relieves us from all fears. He was worshiped by Kuja (Mars), and he relieves from Kuja Dosha (Manglik Dosha) present in our horoscope. Sankashtahara Ganapathi was worshiped by Lord Yama and he also destroys the effect of sins in one’s life.
It is said that Shukla Chaturthi is important for the worship of Varada Ganapathi and Krishna Chaturthi (Bahula Chavithi) is important for the worship of Sankashtahara Ganapathi. Krishna Chaturthi along with Tuesday is more significant and it is called Angaraka Chaturthi or Bhauma Chaturthi these days occur just twice or thrice in a year. But these days which happen to be in Magha Masa are very very rare.