Here is the detailed schedule of Athirathram 2012 of Yetipaka, Bhadrachalam. The 12-day Soma Yagam begins on 21 April and ends on 2 May 2012. Officially the Yagam begins with Dandanirnayam and ends with Udavasaaneeya Ishti.
Day 1, 21 April 2012, Saturday: 8 AM to 11.30 PM
Dandanirnayam, Ukha sambhaaram (Ritual preparation of Ukha Pots), ( Rdhyantham Varana etc ), Vaayavyam Pasu Ishti, (Sacrifice for Vaayu), Samkalpam for Athirathra, Raksha Purusha Varanam, Rthwikvaranam(Election of Priests), Saala Pravesam, Agnimanthanam (Making Fire), Agniviharanam, Koosmanada Homam, Bhakshanam, Apsu Deeksha, Deekshaneeyeshti, Prepration of Fire in Ukha, Deeksha (Consecration of Yajamana), Praishaartham, Vrathapaanam.
Day 2, 22 April 2012, Sunday: 7 AM to 7 PM
Vrathadoham, Vatsapra Upasthaanam, (Adoration of the Ukha Fire), Sani Graham (Soliciting money for the Yajna), Pravargya Sambhaaram (Preparation of Pravargya Implements), Vrathapanam.
Day 3, 23 April 2012, Monday: 6.30 AM to 7 PM
Vrathadoham, Vishnukramanam, Vatsapra Upasthaanam, Yoopa Sampaadanam, Devayajana adhyavasaanam, Akruthiphala Samkalpam, Mahavedeekaranam, Chithi Sthaananirnayam, Kshethra nirnayam,Vrathapaanam, Evening: Vrathadoham & Vrathapaanam.
Day 4, 24 April 2012, Tuesday: 3 AM to 8 PM
Praisham, Preparation of Gaarhapathya Chithi, Praayaneeya Ishti, Padam, Somakrayam (Purchase of Soma), Aathithyeshti, Thaanoonapthram, Somaapyayanam, Avanthara Deeksha, Morning Pravargyam, Upasad, Subrahmanya Aahwanam, Vedeekaranam, Agnikshethropadhaanam, Foundation For the Chithi, First Layer of Chithi, Evening Pravargyam, Upasad, Subrahmanyaahwaanam, Vrathapaanam.
Day 5, 25 April 2012, Wednesday: 6 AM to 8 PM
Praisham, Morning Pravargyam, Upasad, Subrahmanyaahwaanam, Second Layer of Chithi, Evening Pravargyam, Upasad, Subrahmanyaahwaanam.
Day 6, 26 April 2012, Thursday: 6 AM to 8 PM
Morning Pravargyam, Upasad, Subrahmanyaahwaanam,Third Layer of Chithi, Evening Pravargyam, Upasad, Subrahmanya ahwaanam, Vrathapaanam.
Day 7, 27 April 2012, Friday: 6 AM to 8 PM
Morning Pravargyam, Upasad, Subrahmanyaahwaanam, Fourth Layer of Chithi, Evening Pravargyam, Upasad, Subrahmanyaahwaanam.
Day 8, 28 April 2012, Saturday: 6 AM to 8 PM
Morning Pravargyam, Upasad, Subrahmanyaahwaanam, Fifth Layer of Chithi, Saahasraprokshanam, Ishtakaa Dhenukaranam, Sree Rudram Dhaara (Ksheera Dhara), Mandooka Maarjanam, Sarpaahuthi, Saamopasthaanam, Evening Pravargyam, Upasad, Subrahmanyaahwaanam.
Day 9, 29 April 2012, Sunday: 5 AM to 10 PM
Morning Pravargyam, Upasad, Subrahmanyaahwaanam, Gandharva Ahuthi, Chithi Prokshanam, Apakaachchaadanam, Evening Pravargyam, Upasad, Subrahmanyaahwaanam, Gharmodwaasanam, (Disposal of Pravargyam Implements), Agni Pranayanam, Poornaahuthi, Vasordhaara, Vaajaprasaveeyam, Raashtra Bhruth, Setting up of Havirdhaanam, Sadasya,Construction of Dhishnyaam, Agneeshoma Pranayanam, Agneeneeshomeeyam Ishti, Deekshaavisargam, Vapaa Homam – Vapaa Saama, Vasatheevari Parigraham, Subrahmanyaahwaanam, Pasupurodasanirvapanam with Naanabeejam, Pasupurodasa Homam, Pasuhavis ( avayavam).
Day 10, 30 April 2012, Monday: Rituals begin at early morning 2 AM
Round The Clock, Praatharanuvaakam and other Rituals, Somaabhishavam, First Soma Aathuthi (Upaamsu Homam), Praathassavanam, Extraction of Soma juice, Bahish Pavamaana Sthuthi, Graha Grahanam, Savaneeya Yagam, Sthuthi-Sasthras- Somaahuthis, First Aajya Sasthram, First Aajya Sthuthi, Pra uga Sasthram, Second Aajya Sasthram, Second Aajya Sthuthi, Third Aajya Sasthram, Third Aajya Sthuthi, Fourth Aajya Sasthram, Fourth Aajya Sthuthi, Maadhyandina Savanam, Extracting Soma juice, Maadhyandina Pavamaana Sthuthi, Savaneeya Pasupurodaasa Homam, Savaneeya Purodasa Homam, Dakshina, Maruthwatheeya Sasthram, Abhishekam of Yajamana, Bruhat Saamasthuthi, Nishkaivalya Sasthram, Vaamadevya Sthuthi, Second Nishkaivalya sasthram, Naudhasa Sthuthi, Third Nishkaivalya sasthram, Kaaleya Sthuthi, Fourth Nishkaivalya sasthram.
Day 11, 1 May 2012, Tuesday: Round the clock
Thrutheeya savanam, Extraction of Soma juice, Aarbhava Pavamana Sthuthi, Havir Homam, Mahavaiswadeva Sasthram, Agnishoma Sthuthi, Agnimaarutha Sasathram, Ukthya Stuthis, Ukthya Sasthras, Shodasi Sthuthi (When Sun is Half set), Shodasi Sasthram, Rathri Paryaya Sthuthis, Rathri Paryaya Sasthras, Aaswina Sthuthi, Aaswina Sasthram.
Day 12, 2 May 2012, Wednesday: Round the clock
Completion of Aswina Sasthram, Anuyaajam, Haariyojanam, Other Rituals, Avabhrutham, Udayaneeyeshthi, Maithraavaruni, Sakthu Homam, Maithraavaruni Pasu Ishti, Saalaadahanam (Setting Fire the Yaagasaala), Udavasaaneeya Ishti, Fulfilment of Yajna.
For more details on Athirathram 2012, you can go through the official website of Athirathram 2012