Sani Pradosh and Shani Trayodasi are observed on 30 April 2011, Saturday (Today). It is an auspicious occasion that Pradosh vrat falls on Saturday. It highly meritorious to perform Shani Puja and Shani Thailabhishekam on this day.
Trayodasi starts at 5.51 am on 30 April and ends on 1 May 2011. It is even more auspicious that Trayodasi will be during the whole day.