One of the world’s oldest surviving rituals, Vedic Yajna Athirathram was held from April 4 to April 5, 2011 at Panjal in Thrissur District in Kerala. Scientists who studied the effects of yajna on atmosphere, soil and other aspects of environment are of the opinion that, the Vedic Yajna had a positive impact on environment. Vedic Yajna (Yajgya or sacrifice or ritual) is performed for the prosperity of human race through peaceful co-existence with nature by energizing the various forces in nature – especially sun. Agni (fire) represents Sun, the Prathyaksha Brahman or Visible God, in Sanatana Dharma, and it is worshipped during the Yajna. This vedic ritual is known as Athirathram and is one of the world’s oldest surviving ritual. The Hindu Writes The “Athirathram” ritual held on April 4— 15 at Panjal village in Thrissur district was the focus of a detailed study by a team of scientists led by Prof V P N Nampoori, former director of the International School of Photonics, Cochin Univer