* Day 1: Nahakha (literally, bathe and eat):

On the first day of Chhath Puja, the devotees take a dip, preferably in the holy river Ganges, and carry home the holy water of the river Ganges to prepare the offerings. The house and surroundings are scrupulously cleaned. The parvaitin allows themselves only one meal on this day.

* Day 2: Kharna (the day before Chhath):

On Panchami, the day before Chhath, the parvaitins observe a fast for the whole day, which ends in the evening a little after sunset. Just after the worship of earth, the offerings of Rasiao-kheer (rice delicacy), puris (deep-fried puffs of wheat flour) and bananas, are distributed among family and friends. From this day onwards, for the next 36 hours, the parvaitin goes on a fast without water.

* Day 3: Chhath Sanjhiya Arghya (evening offerings):

The day is spent preparing the prasad (offerings) at home. On the eve of this day, the entire household accompanies the parvaitins to a riverbank, pond or a common large water body to make the offerings (Aragh) to the setting sun. It is during this phase of Chhath Puja that the devotees offer prayers to the setting sun.

The occasion is almost a carnival. Besides the parvaitin, there are friends and family, and numerous participants and onlookers, all willing to help and receive the blessings of the worshipper. Ritual rendition of regional folk songs, carried on through oral transmission from mothers and mothers-in-law to daughters and daughters-in-law, are sung on this occasion.

The folk songs sung on the evening of Chhath reflect the culture, social structure, mythology and history of Bihar and Uttar Pradesh. Nowadays, modern Chhath songs, largely Bollywood film remixes, have caught on, but the old tradition still goes strong with a great degree of sanctity. The three main linguistic regions of Bihar (the Maithili, the Magadhi, and the Bhojpuri), and all the various dialects associated with these, have different folk songs; but have an underlying unity in their dedicated to Chhath. The minor nuances of the Chhath rituals, such as in the Kharna ritual, vary from region to region and across families, but still there is a fundamental similarity.

Kosi: On the night of day three, a colorful event of Kosi is held. Here, lighted earthen lamps are kept under a canopy of five sugarcane sticks. The five sticks signify the human body made of Panchatattva (the five great elements - earth, water, fire, air and ether). This is a symbolic ritual in Chhath Puja, performed especially in those families where marriage or childbirth has taken place recently. The lighted lamps signify the solar energy sustaining the human being. People perform this ritual at home, during late evening on day three after making the offering to the setting sun. After that, it is done at the banks of the river on day four before making the offerings to the rising sun.

* Day 4: Parna (the day after Chhath)

Bihaniya Aragh (next morning offerings): On the final day of Chhath Puja, the devotees, along with family and friends, go to the riverbank before sunrise, in order to make the offerings (Aragh) to the rising sun. The festival ends with the breaking of the fast by the parvaitin and friends visiting the houses of the devotees to receive the prashad. Witnessing Chhath being celebrated at the crack of the dawn on a river bank is a beautiful, elating spiritual experience connecting the modern Indian to his ancient cultural roots.