Chhat Pooja or Dala Chhath vrat, a main festival dedicated to Surya Bhagwan, is observed twice a year. Chhat Pooja is observed once in the summer, named Chaiti Chhath and another in the winter, a week after Diwali, called Kartik Chhath. Among these two Chhath festivals, Kartik Chhat is the most celebrated festival.
Chhat Puja is mainly observed by Bihari women. During Chhath, women observe strict fast and sleep on the floor. The performers of the Chhat are also called as ‘Parvaitin. But Chath Pooja is also observed by men. Chhat Puja dedicated to Surya Bhagwan and Lord Kartik is observed for four days.
On the first day during Chhat puja, Naha-Kha or Nahai Khai, a special ritual which means ‘bathe and eat, is observed. Second day of Chhat is called as Kharna festival. Third day of the festival is referred as Chhat Sandhya Argh and the fourth day or the final day is Chhat Suryodaya Argh. Chhat puja concludes with the Chhat Suryodaya Puja.