bohaag bihu is also known as rongali bihu and celebrated with the highest joy and mirth among all the three bihus. as stated it is the commencement time of the new season of farming. but along with, bohaag is the first month according to assamese calendar. hence it is also celebrated as the new year festival. this period also marks the transition in the seasonal cycle and people greet the coming season of spring with enthusiasm. rongali bihu is celebrated over a period of 7 days. there are various phases and significance of the respective 7 days of the bihu. the first day is known as goru bihu (cows are washed and worshipped). this is followed by manuha bihu (human beings take early day bath and wear new attire). then on third day deities are worshipped and washed. hence the festival stretches over a span of time and the celebrations culminate by bidding adieu to bihu on the last day of festival.