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. July 2013 is the auspicious month as two Shani Trayodasi fall during the month.
The first Sani Trayodashi date in July 2013 is July 6 and the second is July 20. Both the Shani Trayodashi fall during Ashada Month in North Indian traditional Hindu calendar whereas the former one is Jyeshta Krishna Trayodashi and the latter one is Ashada Shukla Triodasi in Marathi, Gujarati, Kannada and Telugu calendars.
These two auspicious days also mark the first Shani Trayodashi Vrat in Vijayanama Samvatsara in traditional Hindu calendar.
20th July 2013 – Shani Trayodashi is also considered as Shani Pradosham. Shani Pradosh is the most auspicious day to worship Lord Shiva.
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.