Puratasi is a Tamil month closely associated with Lord Vishnu (Lord Venkateswara). The Puratasi Saturdays are of great significance and special prayers are offered on Saturdays of the month to please Lord Shani or Shani dev. In 2007, Puratasi month starts on September 18 and ends on October 17. Some devotees observe fast on Puratasi Saturdays to please Sani Bhagvan. The Puratasi Saturdays in 2007 are on September 22, September 29, October 6 and October 13.
Update: Details about Puratasi in 2008
According to Hindu mythology, Lord Venkateswara or Balaji descended on earth in the month of Puratasi. Special prayers are offered at the
There is a general belief that Saturdays are free from the influences of Lord Shani or Sani Bhagvan and it is easy to please him on this day. Generally, other navgrahas, other than Sani, have more influence during Puratasi month and therefore it is easy to get blessings from Lord Balaji.
Devotees of Lord Venkateswara take only a meal on Puratasi Saturdays. Some devotees only eat vegetarian food during the month. On Saturdays, Naamum, the two feet symbol of Lord Vishnu’s feet, is drawn on the forehead by males and women opt for a red dot. Hymns dedicated to Lord Vishnu are chanted on Saturdays.
Large number of devotees visit the temples of Lord Vishnu and special flags with Garuda emblem are hoisted in temples. The month is also important from agricultural point of view as it is an important sowing month.