Shani Jayanti or Sani Jayanthi is observed on Amavasya in Vaishakh month or Vaisakha masam. Shani Jayanti 2011 date is 1 June, Wednesday. It falls on Jyeshta Amavasya in North Indian Hindi calendars. Shani Jayanti is considered as the Birthday or appearance day of Lord Shani, one of the navagrahas or nine celestial deities in Hinduism. In Hinduism, Sani is the deity of Shanivar. Shani bhagwan is also called as Shaneeswaran, Sani dev, Sanischara bhagwan or Chaya Putra. Shani Jayanthi is also observed as Shani Amavasya. In 2010, Shani Jayanti has a great significance and spiritual importance as it falls on Saturday.
As Shani Dosham (bad effects from Lord Shanis position in ones birth chart) is considered as an important feature in ones future aspects, Shani Puja is an auspicious ritual for Hindu astrology believers. Shani Thailabhishekam and Shani Shanti puja are the main rituals observed during Shani Jayanthi, Shani Amavasya, and Shani Trayodashi days.
In shani shingnapur Shaneshwara Mandir Sani Jayanthi is a major festival during when many rituals and pujas are observed. Mandapalli Mandeshwara Swamy Temple, Sri Kalahasti Navagraha Temple, Wargal Shaneeshwara Temple in Medak district of Andhra Pradesh, all Navagraha Temples in Tamil Nadu and Karnataka, Shani Jayanti is celebrated with utmost fervor.