The Hindu festival devoted exclusively to the Sun God, Surya — Surya Chhath, also called Dala Chhath and Suryashashthi — is celebrated with much passion and religious fervor throughout Bihar, Jharkhand, parts of Uttar Pradesh, and the Terai areas of Nepal. Nowadays, Chhath Puja is celebrated in other parts also where migrants from these areas have settled in.
In fact, it is celebrated in all regions and major cities of the country. The origin of Chhath Puja can be traced back to the age of the Rig-Veda. The holy scriptures contain hymns worshiping the Sun god and describe comparable rituals.
Chhath is the only occasion when the setting sun — the deity of energy and of the life-force – is fêted for its glory as the cycle of birth begins with death. The Chhath Puja is performed to express gratitude and to thank the god for supporting and nurturing life on earth, and to request the granting of specific boons.