Baisakhi is celebrated every year on April 13 or 14, coinciding with Mesha Sankranti, as both a harvest festival and the start of a new year. The same occasion is marked under different names across India: Puthandu in Tamil Nadu, Vishu in Kerala, Rongali Bihu in Assam and Naba Barsha in West Bengal. These festivals show how a shared solar calendar event is celebrated through varied regional traditions linked to agriculture and the new year.