Chhath Puja is performed by below mentioned processes:
The very first day starts with bath and eat that marks the beginning of Chhath Puja.
The second day of this festival involves a day long fast or vrat till evening puja or worship. On this day devotees or vrattis do not take food and water until the evening worshipping of Chhathi Maiya. Rasiao is made with puris or chapattis as Prasad which is offered to the Chhathi Maiya during evening worship this day and with the same Prasad, vrattis break their day long fast.
Third day involves preparation for Puja Samagri, Prasad and offerings for Evening Arghya to Sun God.
Last and final process is to offer Suryodhaya or Bihaniya Arghya to Sun God. This day the rising sun is worshiped, devotees break their 36-hour long fast and then Prasad is distributes among family and friends.