Aadi Amavasai or Aadi Amavasya is the No Moon day in Aadi month (August) as per Tamil calendar. Aadi Amavasai 2012 date is July 18, Wednesday. It is also celebrated on 19 July in some places. Amavasai begins at 9.38 AM on 18 July and ends at 10.20 AM on 19 July.
Aadi Amavasai is dedicated to forefathers and dead ancestors. Amavasya is considered very auspicious day in Tamil calendar and Aadi Amavasya is highly auspicious. This year it is also observed as Shani Amavasai as it falls on Shanivaram (Saturday).
Aadi Amavasai special pujas are performed in all temples in Tamil Nadu. Tamil people offer their prayers and pujas to their forefathers and dead ancestors. Amavasya Tharpanam and other rituals are observed on Aadi Amavasai day.
The similar ritual is performed as Karkidaka Vavubali in Kerala and Haryali Amavasya (Shravan Amavasya) in North India. It is Ashada Amavasya as per Marathi, Gujarati, Telugu, and Kannada calendars. It is known as Gatari Amavasya in Maharashtra, Chukkala Amavasya in Andhra Pradesh, Bheemana Amavasya in Karnataka, and Chitlagi Amavasya in Odisha.