Chhath Puja, prominent in Bihar, Uttar Pradesh, Madhya Pradesh, and West Bengal, honors Lord Surya. The rituals span four days: Nahaye Khaye involves spiritual purification, Kharna includes a Nirjala fast, Sandhya Arghya features an evening offering to the Sun God, and Usha Arghya concludes with prayers to the rising Sun and breaking the fast.