Shani Trayodashi or Sani Trayodasi puja is an important day to worship Lord Shani and to perform Shani puja to get rid of effects of Sani. In October 2012, Shani Trayodasi falls on October 13 and October 27.
Sani Triodasi of 13th October falls in Krishna Paksha of Ashwin monthas per North Indian Hindi calendar and in Bhadrapada Month of Marathi, Gujarati, Telugu & Kannada calendars. It falls in Aashin Month of Bengali calendar, Purattasi Masam of Tamil Panjangam and Kanni Month in Malayalam calendar.
Shani Trayodasi of 27th October 2012 falls in Shukla Paksha of Ashwin month as per all lunar Hindu calendars. It falls in Kartik Month of Bengali Panjika, Aippasi Month in Tamil calendar and in Thulam month of Malayalam calendar.
Sani Thailabhishekam, Shani Shanti Puja and Japam are the important rituals performed on Shani Trayodashi vrat.