Pradosh Vrat, also known as Pradosha, is dedicated to Lord Shiva. Pradosh day falls on the 13th day of a lunar fortnight. Shiva devotees observe fast from sunrise to the end of Pradosha period. The puja and rituals are performed during the twilight period. June 2015 Pradosh dates are June 14 and June 29.
The Pradosha on June 29 is also known as Som Pradosh as it falls on Monday.
Pradosh as the name indicates is a period just before sunset and after sunset. The Pradosha period is between 1.5 hours before sunset and 1 hour after sunset.
It is believed that Lord Shiva and Goddess Parvati are in a pleasant mood during this period and they fulfill the wishes of the devotees.
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