Shani Trayodashi or Sani Trayodasi is an auspicious day for Hindus who perform Shani Puja. It is celebrated on Trayodashi day or the thirteenth lunar day which falls on Shanivar or Saturday. In 2010, the first Shani Trayodasi date is February 27, 2010. It falls in Falgun month.
Devotees and believers of Shani dosham perform Shani dosha puja and Shani Shanti puja to please Sani. They do this puja for reduced or minimised effects of Shani dosha. Some people observe fast on the day of Shani Triodasi. Thailabishekam is one of the most popular pujas to worship Sani and to pacify the effects of Sani.