Sankashti Chaturti, or Sankatahara Chaturti, is a monthly observance and fasting dedicated to Lord Ganesh in a traditional Hindu lunar month. The date of Sankashti Chaturthi Vrata is Thursday, July 29, 2010. It falls during (Krishna Paksha) the waning phase of the moon – fourth day after the full moon. Devout Hindus who are Ganesha devotees observe a fast (upvaas) on the day. Sankashta Chaturthi is known as Sankatahara Chaturti in
Fasting on Sankatahara Chaturthi begins at sunrise and ends after evening puja or after sighting the moon. Ganesh Temples conduct special pujas on the day.
It is popularly believed that observing Sankashta Chaturthi will bring material progress, happiness and fulfillment of desires. The importance of Sankatahara Chaturthi Vrata was explained by Lord Krishna to Yudhishtira, the eldest of the Pandavas. It is also detailed in the Narasimha Purana and Bhavishaya Purana.