The auspicious festival of Baisakhi is celebrated on first day of Vaisakh month (April-May) according to the Nanakshahi calendar. Hence, the festival of Baisakhi is also popularly known as Vaisakhi. According to Gregorian Calendar, Baisakhi falls on April 13 every year and on April 14 once in 36 years. This variation in date is due to the fact that date of Baisakhi is reckoned according to the Indian solar calendar and not the lunar calendar.
Vaisakhi marks the beginning of the new spring year and the end of the harvest of rabi crop in India. The festival is celebrated with lot of enthusiasm in agriculture dominated state of Punjab and Haryana. Here, farmers thank God for the bountiful harvest and pray for prosperity in the coming year. To celebrate the day, people wake up early and take a dip in the holy rivers. Soon after, cries of “Jatta aai Baisakhi" rent the skies as the people of Punjab attired in their best clothes break into the Bhangra dance to express their joy.
The date of Baisakhi has major astrological significance as it marks the sun’s entry into Mesh Rashi. Some people therefore know Baisakhi as Mesha Sankranti. The auspicious date of Baisakhi is celebrated as 'Rongali Bihu' in Assam, 'Naba Barsha' in Bengal, ‘Puthandu’ in Tamil Nadu, 'Pooram Vishu' in Kerala and ‘Vaishakha’ in Bihar.
The date of Baisakhi festival has tremendous significance in Sikhism. They celebrate the festival as a collective birthday of the tenth Sikh Guru, Guru Gobind Singh and the foundation of the Khalsa (the Sikh brotherhood) in 1699. Sikhs all over the world celebrate the day with lot of enthusiasm and joy.