Pradosh Vrata is observed on every thirteenth day of both the dark and bright of half of each month. It is particularly observed by those women who wish to have son. Lord Shiva is the centre of worship on this day. ‘Pradosh’ literally means beginning and since the religious rites of this vrata begin in the early hours of the night, the vrata is called pradosh vrata. The pradosh vrata that falls on Saturday of the dark half is considered to bring lots of blessings.