'[b]Baisakhi[/b] (Punjabi: ਵੈਸਾਖੀ, vaisākhī, also known as Vaisakhi) marks the Punjabi New Year and the beginning of the harvest season in Punjab, India. Baisakhi falls in the [b]Nanakshahi calendar[/b] (neither in the Amantha- nor in the Purnimantha-calendar) on the first day of Vaisakh month and marks the sun entering Mesha Rasi (this fact is called Mesha Sankranti). [b]Vaisakhi[/b] is therefore determined by the solar calendar. Baisakhi usually falls on April 13, and on April 14 once every thirty-six years. It coincides with [b]Rongali Bihu[/b] in Assam, [b]Naba Barsha[/b] in Bengal, [b]Puthandu[/b] in Tamil Nadu, '[b]Pooram Vishu[/b]' in Kerala, and the [b]Sinhala[/b]/Tamil new year festival in Sri Lanka.