Each lunar month in Hindu calendar has two Chaturthi Tithis. The one after Purnima or full moon (this period is known as Krishna Paksha) is called asSankashti Chaturthi and the one after Amavasya or new moon(this period is known as Shukla Paksha) is called as Vinayaka Chaturthi. Sankashti Chaturthi vrat is observed to be free of dangers, Deity of this vrat is Sri Vighnavinayak Ganeshji. Vinayaki Chaturthi fast is observed throughout the day of Vinayaki Chaturthi. ‘Sri Sidhhivinayak’ is the Deity of this vrat.
In North India Sankashti Chaturthi during Magha month is known as Sakat Chauth. Also Vinayaka Chaturthi during Bhadrapada month is known as Ganesha Chaturthi. Ganesha Chaturthi is celebrated by Hindus all over the world as the birthday of Lord Ganesha.
Sankashti Chaturthi is also known as Ganesh Sankatahara or Sankatahara Chaturthi among Tamil Hindus.
Sankashti Chaturthi fasting is done every month. The most significant Sankashti Chaturthi falls in month of Magha according to Purnimant School and in month of Paush according to Amavasyant School.
Here is How to Perform Sankshti Chaturthi Vrat
Sankashti Vrat and Puja is dedicated to Lord Ganesha and is observed on the fourth day after Purnima or full moon. Sankashti fasting is from morning to the sighting of the moon. Sankashti Puja is performed in the evening. Observing Sankashta Chaturthi is believed to help in removing all difficulties and obstacles in life.
For most people Sankashti Chaturti is a complete fast which is broken after sighting the moon and performing puja. There are also people who observe partial fast.
Following are rituals associated with Sankashtachaturthi vrat
Fasting throughout the day.
Ritualistic worship of Sri Ganeshji in the evening
Darshan of the moon
Worship of the moon (Chandrapujan)
Along with this, as a way of worship, people having faith in Sri Ganeshji perform various actions as per their ability like:
Going for darshan to the temple on foot or going on bare feet.
Listening to or reciting Sri Mudgalapurana,
Sri Ganeshsahasranamavali etc..
Reciting the stotrasChanting etc.