The Taittirīya Brāhmaṇa (Sanskrit तैत्तिरीयब्राह्मण, meaning 'Brāhmaṇa of the school of Tittri', abbreviated to 'TB') is a commentary on the Krishna Yajurveda. Considered by academics to be an appendix or extension of the Taittirīya Samhita, the first two books (ashṭakas) largely consist of hymns and Mantras to the Vedic-era Devas, as well as Mythology, astronomy, and astrology (i.e. the Nakshatras); the third book contains commentaries and instructions on Vedic sacrificial rites such as the Purushamedha, Kaukili-Sutramani, Ashvamedha, and Agnicayana.