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Ancient Tibetan astronomy still shining today

By Source:China Daily 2016-11-03

Tibetan Buddhism conjures up images of prayer wheels, mandalas and prostration, but there is one other indispensable item: a calendar. Aside from some textbooks, the Tibetan Annual Almanac is the most widely circulated book in the Tibet autonomous region. The information it contains is critical to everyday life, especially for farmers, herders, doctors and Buddhists.

The Astronomy Calendar Research Institute of the Tibetan Hospital in Lhasa helps make the almanac using astronomy based on the tantric Kalachakra: the wheel of time.

Dating back more than 2,000 years, the Kalachakra describes eclipses as an alignment of the sun, moon and appropriate lunar nodes, exactly the same as modern astronomy.

It shows the specific dates and times of eclipses, auspicious days for farming and other activities, as well as the timing of Buddhist festivals.


Digital calculation

For thousands of years, these calculations were done by hand, according to Yinba, director of the institute.

All the calendarists in Yinba's teams have gone through strict training in either monasteries or research institutes. They must memorize sophisticated formulas and be adept at mental arithmetic, as no scratch paper is ever available.

Instead, they have traditionally made their calculations by writing with a stick in a tray of sand, quickly memorizing the numbers as they were ceaselessly erased for the next calculation.

To make the figures easier to handle, ancient astronomy masters devised a set of "calculation verses" that calendar makers chant while calculating.

In an attempt to speed up the time-consuming work, the institute brought in calculators in the 1990s - but the astronomical data proved too much for these early devices.

Yet as computers became more advanced, Yinba and his team began to develop a set of algorithms on astronomical changes and the changing days.

Key in a few numbers into the system today, and with a click of the mouse, all 52 pages of astronomical data for 2016 will pop up onto the screen in two or three seconds.

Using these algorithms, the institute has now published the first Tibetan calendar book covering AD 1 to 2100.

In the past, it took an astronomical master and his apprentices more than 30 years to produce a new calendar, combining the four schools of traditional Tibetan calendar making while working with both the Gregorian calendar and Chinese lunar calendars.

Yinba said manual calculation is still used to double check, but the computers allows more time to be spent on research and training students.

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