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A Batak Shaman’s Bone Almanac

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Featured in Ripley's Believe It or Not!

bone almanac

In the fecund jungles of West Sumatra, in the island nation of Indonesia, Batak shamans known as datu looked to the sky on the last moonless night in May. They watched as the belt of Orion slipped below the horizon and the constellation Scorpio rose in the east. This marked the first day of a new month and the first month of the New Year.

Calendar keeping was of the utmost importance to the datu. It was their job to advise farmers when to plant and to determine the correct days to perform rituals—and to avoid the inauspicious days. While much of this can be tied to religion, much of the work a Sumatran shaman performed was integral to feeding the people of their island.

bone almanac

The 12 columns represent the months, and the 30 rows represent the days.

In the heyday of shamanic power in Indonesia, much of their cultural events were layered in rituals controlled by mystics traveling from village to village. These shamans had a number of tools they used to divine the best courses of action for their people. By consulting Batak spellbooks known as pustaha, they used intricate bone calendars to calculate the best day for a ritual two months ahead of time. The bone calendar, known as a porhalaan, got its name from the Sanskrit word for scorpion—a nod to the constellation kicking off their New Year.

The calendar was typically engraved onto buffalo bones for durability. Carvings of serpents, lizards, and scorpions were often accompanied by other decorations, and instructions or reference notes.

batak bone almanac

The datu followed a lunar calendar influenced heavily by Hindu tradition. The landmark days of a month correspond with Moon phases, and the days themselves were named for the Sun, Moon, and succeeding planets. Because their calendar held fast to 30-day months and relied on the Moon, some porhalaan have an extra thirteenth month in order to reconcile leap years or to make calculating a date that falls into the following year simpler for the shaman.

Source: A Batak Shaman’s Bone Almanac

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