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Borana calendar
The Borana calendar is a calendrical system developed by the Borana Oromo around 300 BC. The Borana calendar consist of 29.5 days and 12 months for a total 354 days in a year.The calendar has no weeks but name for each day of the month. It is a lunar-stellar calendar system.〔 (The Borana Calendar REINTERPRETED ). Current Anthropology. Physics and Astronomy Department, University of California, Santa Cruz, at NASA Ames Research Center, Space Sciences Division, M.S., retrieved: 7 April 2010.〕〔Asmarom Legesse. Gada Three Approaches to the Study of African Society. The Free Press A Division of McMillan Co. Inc, 1973〕
== History ==
''Main article: Namoratunga ''
It is believed that the Borana have developed their own calendar around 300 BC. In Namoratunga archaeoastronomical site in northern Kenya, stone pillars pointing to positions of stars used in Borana calendar were found. Namoratunga II contains 19 basalt pillars, aligned with 7 star systems of the Borana calendar: Triangulum, Pleiades, Bellatrix, Aldebaran, Central Orion, Saiph, and Sirius. It is believed that the Borana used these astronomical observation site to develop the calendar.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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