2nd century BC-4th century AD: Until the introduction of Buddhism in Tibet in the fourth century AD, the Bon religion forms the basis of Tibetan astrology. Its doctrines are presented in a detailed system of categories and sub-categories, two of which are astrology and medicine. The Bon doctrines acknowledge the five elements of Wood, Fire, Earth, Metal and Water, and use a system of astrological prediction and divination similar to shamanism.

6th century AD: Tibetan King Namri Songtsen sends four of Tibet's most brilliant young scholars to China to study astrology. On their return, the four introduce invaluable information to Tibetan astrology. However, there being no written language of Tibet at the time, the information is only conveyed orally.

7th century AD: The fifth wife of Tibetan King Songtsen Gampo, Kong Ju, an accomplished astrologer, introduces Classical Elemental Astrology to Tibet.

8th century AD: Generally regarded as the pinnacle or "Golden Age" in Tibetan medicine, astrology, and Dharma, each field enjoys its highest patronage and development. In fact, the high standards set by Tibetan scholars in this period inspire Tibetan scholars for centuries to come.

Indian Sage Guru Padma Sambhava introduces the concept that elements in their pure form are the basis of all life in the universe, and that the same elements in their impure form are poisonous to the body.
10th century AD: At the hands of weak leadership, there is a decline in Tibetan power, and with it, a decline in Tibetan astrology.
11th century AD: The Sri Kalachakra Tantra, which forms the basis of modern Tibetan astrology, is translated from Sanskrit into Tibetan. Its principles lead to the creation of the first annual Tibetan almanac, which allows the user to determine the precise day-to-day positions of the stars, planets and signs of the zodiac.

17th century AD: Under the leadership of H.H the Fifth Dalai Lama, Ngawang Lobsang Gyatso, Tibetan astronomy and astrology rise to their previous glory. His Holiness's regent, Desi Sangye Gyatso, compiles a folio of Tibetan astrology, which is still in use in the late twentieth century.
 
 
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