The Tamil Calendar has 12 months named Chithirai, Vaikasi, Aani, Aadi, Avani, Purattasi, Aippasi, Karrtikai, Margazhi, Thai, Maasi, and Panguni ποΈ. Each month typically has 29 to 31 days. The new month begins with the new moon, called Amavasai π, and the
full moon day is called Pournami π. The year starts when the sun enters the Tamil month of Chithirai, which usually happens around April 14th. This structure helps people in Tamil Nadu celebrate special occasions according to the lunar cycle.