Pradosh Vrat is dedicated to Shiva and Parvati and is observed on the 13th day of each lunar fortnight in a Hindu calendar. Pradosh Vrat dates in December 2016 are December 11 and December 26.
December 26 Pradosh is on Monday, therefore it is known as Som Pradosh.
The fasting on Pradosh begins at sunrise and ends during the twilight period. The fasting is very popular with Shiva devotees in