Chhath (In Hindi also called Dala Chhath), is also known as ‘Suryasasthi’. It is observed after the six days of Diwali, the festival of light. It is an ancient Hindu festival and only Vedic Festival dedicated to the Hindu God, Surya (The Sun). The Sun, considered the god of energy and of the life-force. In Hinduism, Sun worship is believed to help cure a variety of diseases and helps ensure the longevity and prosperity of family members, friends and elders. The Chhath Puja is performed in order to thank Surya for sustaining life on earth. This is the only holy festival which has no involvement of any pandit (priest).
Chhath is the holiest Hindu festival of Bihar and extends to four days as follows: