The Chhath Puja is essentially a festival of Bihar. It is, however, also celeberated in Eastern U.P & terai region of Nepal. Everywhere, from a small and nondescript village in Bihar to the urban Delhi and Mumbai, Mauritius to Fiji, U.S to Australia, whereever there are people from Bihar, they celebrate the function with great devotion.
It is perhaps the most ancient festival, predates the Vedic period. The Rig Ved devotes considerable space to the hymn on the Sun God. The similar rituals find description in the Sanskrit version of the Mahabharata. Draupadi has been depicted as observing the similar festival. Karna, the legendary warrior who fought against the Pandavas, was the son of the Lord Sun. It is believed that he was a great worshipper of his father and started the difficult and arduous festival of Chhath. He was the king of Ang Desh, modern day Bhagalpur and Munger districts of Bihar.
There is also another folk lore. One of the grandsons of the Lord Krishna suffered from leprosy. It is believed that Krishna had advised to pay obsience to Lord Sun during the month of Kartik and by doing so, his grandson was relieved from the disease. The festival of Chhath started thereafter. Deo in Aurangabad and Baragaon in Nalanda are two very important places associated with the Chhath. These two villages have very ancient and magnificent temples devoted to the Lord Sun. The unique aspect of the Sun temple in Deo is that the temple faces west.
Chhath calls for very arduous observance of rites and rituals , the main person who offers the Puja is required to follow a four days continued observance of abstienence and segregation with common households, complying a very strict and restricted diet, and completely fasting for 36 hours without even taking water. The Arghya is offered to the setting sun and to the rising sun on the following day. Chhath is perhaps the only prayer anywhere in the world where the setting sun is worshipped. This is highly significant which underlines the cultural ethos of the region – respect even the setting sun.
The Chhath festival is a very pious occassion which offers an opportunity to pay our gratitute and thanks to the Sun for bestowing life not only on us but also on all the living beings and on the plant kingdom.