Tibetan medicine and Tibetan calendar are calculated from Tibetan calendar.

In Tibet, Tibetan medicine and Tibetan calendar are closely linked. In the 8th century A.D., the Four Medical Codes written by Tibetan medical scientist Yuto Ma Ning Yuandan Kampot came out, forming a relatively complete theoretical system of Tibetan medicine. Because Tibetan doctors believe that with the change of seasons, the qi and blood circulation of the five internal organs of the human body is also different, so Tibetan doctors attach great importance to observing the changes of stars, clouds, winds, lakes and birds.

According to Tibetan custom, astronomical calendar merchants are located in Tibetan hospitals. There are a group of scholars in Tibetan medical colleges. Every year's almanac was calculated by scholars of Tibetan Medical College in the previous year.

The official use of the Tibetan calendar began in A.D. 1027 and has been popular ever since. It turns out that in the first century BC, Tibetans had their own calendar algorithm, that is, the full moon, the missing moon, the new moon and the full moon were used to calculate the calendar of Bonism. At that time, New Year's Day was equivalent to the current Tibetan calendar 1 1 month 1 day. There is an ancient calendar called "textile calendar calculation for the elderly", which summarizes in detail the rich production experience and astronomical calendar knowledge of the Tibetan people at that time. Later, Princess Wencheng entered Tibet and brought many ancient books, among which the astronomical almanac played an important role in perfecting and developing the original Tibetan calendar. At this time, the determination of New Year's date has progressed from the brightness of the moon to the stars as the main basis, that is, the brightness and position of ghost stars as the standard. However, the New Year is still on 1 1 month 1 day in the Tibetan calendar. Later, the original Tibetan calendar absorbed the calendar calculation technology of the Han nationality and gradually improved into today's Tibetan calendar.

The Tibetan calendar stipulates that a year is 12 months, with 30 days for the big month and 29 days for the small month. There is a leap month every thousand days or so to adjust the relationship between months and seasons. The Tibetan calendar adopts the chronological method of the time wheel system, and divides celestial bodies into twelve constellations, namely: Aries, Pisces, Taurus, Capricorn, Gemini, Lion, Cancer, Aquarius, Sagittarius, Virgo, Scorpio and Libra. Match the zodiac with the five-element chronology. Taking 12 years as a small cycle and 60 years as a big cycle is called a "round" (that is, a round). The first "Rao Tong" began in A.D. 1027. 1987 is the first year of 17 "Bypass Jiong". Tibetan calendar 199 1 is called the Year of the Golden Sheep. This is similar to the chronology of the China lunar calendar, and the genus is the same.

The Tibetan calendar not only predicts whether there will be good weather, drought, snowstorm or earthquake in the coming year, but also indicates the good or bad luck of every day when it rains. It is said that Naqu Tibetan Hospital predicted three earthquakes in northern Tibet during 1986, and the approximate time and orientation were very accurate. Mainly based on astronomical forecasts. The astronomical phenomenon is a giant Buddha. The giant Buddha symbolizes the earth and its posture. If the giant Buddha stands, it means there are earthquakes, hurricanes and plagues. As soon as the giant Buddha sits, the ground will be peaceful.