Astrology is one of the traditional arts and sciences of Tibet, where it is known as "the science of calculation," used by monks and lamas in the study of the rhythms and cycles of time, for divination, for choosing auspicious times for rituals and life-cycle events such as marriages and funerals, and as an adjunct to the practice of traditional medicine.

Also included are numerous diagrams and charts that are indispensable to the practice of Tibetan astrology, including tables for converting Western dates to dates on the Tibetan calendar.