Today, 9 January 2013 is Pradosh Vrat. As it falls on Budhavara (Wednesday), Budha graha pradosha puja is observed. In some places, Budha graha shanti pujas are also observed along with Pradosha kaala Shiva puja.
It falls on Krishna Paksha Trayodasi in Margashirsha month as per Telugu, Kannada, Marathi & Gujarati calendars. And it is Krishna Paksha Trayodasi in Paush month in North Indian Hindi calendars.
Pradosha Kaala Shiva Puja time is between 4.30 to 6 in the evening. Pradosha Ashtakam is a popular prayer chanted during Pradosh Shiva Puja.