The Kalachakra Tantra--Kalachakra means wheel of time--is a tradition of Buddhist theory and practice whose root text treats a fantastic expanse of knowledge ranging from observations of the cosmos to investigations of meditative states and vital bodily energies. In the Tibetan-speaking world, a public Kalachakra initiation remains the most sought-after eveny in the life of a devout Buddhist. The Fourteenth Dalai Lama has long had a strong connection with the Kalachakra Tantra and brought the initiation to the West in 1981, performing it in the U.S., Switzerland, Spain, and Australia. This volume has been created to celebrate his long involvement with the Kalachakra teachings.