Chhath Puja is a four-day festival dedicated to the Sun God and is celebrated in Bihar, Jharkhand, and eastern Uttar Pradesh. The festival involves fasting from sunrise to sunset and has various rituals and timings that hold significance for devotees. The festivities begin with Nahay Khay on November 17, followed by Kharna, Chhath Puja, and Usha Arghya. On the first day, devotees wake up early to worship Lord Surya before eating, marking the start of the fasting period. People dress nicely, fast, and prepare chana dal and pumpkin rice as prasad for the Sun god.