They involve elaborate activities on a large scale (building of Agnichayana), extending from more than 12 days to a number of years, involving various offerings made into the fire, requiring not only the four [[Rtvik (ऋत्विक्)|Rtviks]] (Adhvaryu, Hotr, Udgata and Brahma) but others upto 16 in number for complicated yagas (Somayaga). The mantras used here are prescribed in the Vedanga Kalpas as Shrauta sutras. Example : Somayaga, Sattrayaga, Rajasuya yaga. | They involve elaborate activities on a large scale (building of Agnichayana), extending from more than 12 days to a number of years, involving various offerings made into the fire, requiring not only the four [[Rtvik (ऋत्विक्)|Rtviks]] (Adhvaryu, Hotr, Udgata and Brahma) but others upto 16 in number for complicated yagas (Somayaga). The mantras used here are prescribed in the Vedanga Kalpas as Shrauta sutras. Example : Somayaga, Sattrayaga, Rajasuya yaga. |