Vishnupathi Punyakalam in August 2013 is Sun in Leo Vishnupathi (transition of Surya Bhagawan into Simha rashi). Vishnupati August 2013 date is August 17.
It is the 3rd Vishnupathi in 2013 year. On the day of Vishnupati, nine hour period from 1.30 in the late night to 10.30 in the morning is referred as Vishnupathi Punya kaalam.
Vishnu pati punya kaalam is one of the most important celebrations for Vaishnavites and the Vaishnava temples. On Vishnupathi day, in many temples Kumbhabhishekam or Mahakumbhabishekam or Sahasra Kumbhabishekam are performed.
Vishnu Sahasranama sankeerthana (recital of Vishnu Sahasranamam), Bhagavatha Parayanam, and recital Vishnu Purana & Purusha Suktha are performed on Vishnu Pati day.
Next Vishnupathi will be in November 2013.