November 10: Today (November 10) is the main day of the Chhath festival which is observed as a common cultural symbol of Tarai/Madhes.   
The festival is dedicated to the Sun God, with offerings made to the rising and setting Sun. It is observed for four days, from the fourth day to the seventh day of the bright half in the month of Kartik as per the lunar calendar. It usually falls between October and November in the Gregorian calendar. The Sun considered as the God of energy and of the life-force, is worshiped during the Chhath festival to promote well-being, prosperity and progress of family members.    
The ritual of Chhath festival includes taking holy bath, fasting and worshiping the Sun and offering curd to the ‘Rising and Setting Sun'. Chhath is a festival of bathing and worshipping that follows a period of abstinence and segregation of the worshiper from the main household for four days. During this period, the worshiper observes purity, and sleeps on the floor on a single blanket. This is the only holy festival which has no involvement of any priest.    
The devotees offer their prayers to the setting sun today, and conclude the festival by offering prayers to the rising sun the next morning to celebrate its glory as the cycle of birth starts with death. (With inputs from RSS)