The first day of Chhath Puja is called Nahay Khay, followed by Kharna, Sandhya Arghya, and finally Usha Arghya tomorrow, marking the conclusion of the festival.
Devotees purify themselves by taking a holy dip in a river or nearby water body and consume a single meal. The most significant day, Sandhya Arghya, involves a complete day of fasting without water.