What is Borana calendar?

The Borana calendar is a calendrical system once thought to have been used by the Borana Oromo, a people living in southern Ethiopia and northern Kenya. The calendar has been claimed to be based on an earlier Cushitic calendar, developed around 300 BC found at Namoratunga. However, reconsideration of the Namoratunga site led astronomer and archaeologist Clive Ruggles to conclude that there is no relationship. 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.