Associated with the promotion of world peace, the Kalachakra — or ''Wheel of Time'' — tantra is one of the most detailed and encompassing systems of theory and practice within Tibetan Buddhism. Kalachakra Tantra contains a complete translation of the Kalachakra initiation ritual as conferred by His Holiness the Dalai Lama in Toronto in April 2004, along with his commentary, and a comprehensive introduction by Professor Jeffrey Hopkins that explores the Kalachakra's rich symbolism, meaning, and history. The book also includes the Six-Session Yoga.