Sudarshana Jayanthi is the first appearance day of Sri Sudarshana Chakra (Sri Chakrathazhwar). In 2014, Sudarshana Jayanthi date is 6 July, Sunday.
Sudarshana Jayanti falls on Aani Chitirai (Chithirai Nakshatram in Aani Masam).
The Sudarshan Chakra is a spinning, disk-like super weapon with 108 serrated edges used by the Hindu god Vishnu. The Sudarshana Chakra is portrayed on the right rear hand of the four hands of Vishnu, who also holds a Shankha (a conch shell) in his left fore hand, a Gada (mace) in his left rear hand, and a Padma (lotus bud) in his right fore hand.
According to the Puranas, Sudarshana Chakra is used for the ultimate destruction of an enemy. The depiction of Vishnu with Sudarshana Chakra also means that Vishnu is the keeper-owner of the celestial bodies and heavens.